{"id":42170,"date":"2023-05-01T10:21:11","date_gmt":"2022-11-06T18:23:42","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e6%88%91%e5%af%b9%e5%ad%a6%e4%b9%a0postgresql%e7%9a%8418%e4%b8%aa%e5%b7%ae%e8%b7%9d%e7%9a%84%e5%88%9d%e6%ad%a5%e6%84%9f%e5%8f%97\/"},"modified":"2024-04-30T02:08:48","modified_gmt":"2024-04-29T18:08:48","slug":"%e6%88%91%e5%af%b9%e5%ad%a6%e4%b9%a0postgresql%e7%9a%8418%e4%b8%aa%e5%b7%ae%e8%b7%9d%e7%9a%84%e5%88%9d%e6%ad%a5%e6%84%9f%e5%8f%97","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e6%88%91%e5%af%b9%e5%ad%a6%e4%b9%a0postgresql%e7%9a%8418%e4%b8%aa%e5%b7%ae%e8%b7%9d%e7%9a%84%e5%88%9d%e6%ad%a5%e6%84%9f%e5%8f%97\/","title":{"rendered":"\u6211\u5bf9\u5b66\u4e60PostgreSQL\u768418\u4e2a\u5dee\u8ddd\u7684\u521d\u6b65\u611f\u53d7"},"content":{"rendered":"

\u9996\u5148<\/h1>\n

\u901a\u8fc7\u5728PostgreSQL\u4e2d\u8fdb\u884c\u805a\u5408\u548c\u5206\u6790\u6570\u767e\u4e07\u6761\u6570\u636e\u7684\u5de5\u4f5c\uff0c\u6211\u4eec\u603b\u7ed3\u51fa\u4ee5\u4e0b\u7684\u7ecf\u9a8c\u3002\u6211\u4eec\u6839\u636e\u611f\u89c9\u5230\u7684\u5dee\u8ddd\u548c\u9047\u5230\u7684\u56f0\u96be\u8fdb\u884c\u6392\u5e8f\uff0c\u6240\u4ee5\u6587\u7ae0\u7684\u7ed3\u6784\u4f1a\u81ea\u7136\u800c\u7136\u5730\u9010\u6e10\u63d0\u9ad8 \ud83d\ude42<\/p>\n

\u8fd9\u4e2a\u5185\u5bb9\u662f\u5173\u4e8ePostgreSQL\u548cOracle\u7684\u6bd4\u8f83\u3002\u6211\u5c1d\u8bd5\u8fc7\u4e24\u8005\uff0c\u89c9\u5f97PostgreSQL\u548cOracle\u90fd\u5f88\u68d2\uff01\uff08\uff77\uff98\uff6f<\/p>\n

\"posora.png\"<\/div>\n

2022\u5e747\u67082\u65e5\uff0c\u6211\u5728\u516c\u53f8\u540c\u4e8b\u5ca1\u90e8\u5148\u751f\u7684\u5171\u4eab\u4e2d\u6ce8\u610f\u5230\u5e03\u5c40\u51fa\u73b0\u4e86\u6df7\u4e71\uff0c\u5e76\u6536\u5230\u4e86\u4e00\u4e9b\u8bc4\u8bba\u3002\u6211\u8fdb\u884c\u4e86\u4e00\u4e9b\u4fee\u6b63\u3002<\/p>\n

\u6570\u636e\u64cd\u7eb5\u8bed\u8a00 (DML)<\/h1>\n

\u4e0d\u9700\u8981\u53e5\u5b50\u5c31\u53ef\u4ee5\u6267\u884c\u67e5\u8be2\u3002<\/h2>\n

\u5728Oracle\u4e2d\uff0c\u9700\u8981\u4f7f\u7528 “from dual” \u8fd9\u4e2a\u8bed\u53e5\u975e\u5e38\u91cd\u8981\u3002
\n\u53ea\u9700\u5199\u4e0a\u8fd9\u4e48\u4e00\u53e5\uff0c\u5c31\u53ef\u4ee5\u975e\u5e38\u8f7b\u677e\u5730\u7f16\u5199\u67e5\u8be2\u8bed\u53e5\uff0c\u8ba9\u7f16\u7a0b\u53d8\u5f97\u975e\u5e38\u8212\u9002\u3002<\/p>\n

><\/span> select<\/span> 1<\/span> as<\/span> a<\/span>,<\/span> 2<\/span> as<\/span> b<\/span> ,<\/span>3<\/span> as<\/span> c<\/span>\r\n+<\/span>-----+-----+-----+<\/span>\r\n|<\/span>   a<\/span> |<\/span>   b<\/span> |<\/span>   c<\/span> |<\/span>\r\n|<\/span>-----+-----+-----|<\/span>\r\n|<\/span>   1<\/span> |<\/span>   2<\/span> |<\/span>   3<\/span> |<\/span>\r\n+<\/span>-----+-----+-----+<\/span>\r\n<\/code><\/pre>\n
SQL<\/span>><\/span> select<\/span> 1<\/span> as<\/span> a<\/span>,<\/span> 2<\/span> as<\/span> b<\/span> ,<\/span>3<\/span> as<\/span> c<\/span> from<\/span> dual<\/span>;<\/span>\r\n\r\n         A<\/span>          B<\/span>          C<\/span>\r\n---------- ---------- ----------<\/span>\r\n         1<\/span>          2<\/span>          3<\/span>\r\n<\/code><\/pre>\n
2. \u83b7\u53d6\u5e8f\u5217\u7684\u65b9\u6cd5 de<\/h2>\n
\u5728Oracle\u4e2d\uff0cSQL\u8bed\u53e5\u5fc5\u9700\u5305\u542bfrom\u5b50\u53e5\uff0c\u6240\u4ee5\u9700\u8981\u6307\u5b9adual\u8868\u3002
\n\u540c\u65f6\uff0c\u53ef\u4ee5\u901a\u8fc7<\u5e8f\u5217\u5bf9\u8c61\u540d>.nextval\u83b7\u53d6\u503c\u3002<\/p>\n
><\/span> select<\/span> nextval<\/span>(<\/span>'seq_test'<\/span>)<\/span> as<\/span> seq_no<\/span>;<\/span>\r\n\r\n+<\/span>----------+<\/span>\r\n|<\/span>   seq_no<\/span> |<\/span>\r\n|<\/span>----------|<\/span>\r\n|<\/span>      166<\/span> |<\/span>\r\n+<\/span>----------+<\/span>\r\n<\/code><\/pre>\n
\u8fd9\u4e2a\u5dee\u522b\u5e76\u4e0d\u592a\u4ee4\u4eba\u611f\u5230\u4e0d\u8212\u670d\u3002<\/p>\n
><\/span> select<\/span> seq_test<\/span>.<\/span>nextval<\/span> from<\/span> dual<\/span>;<\/span>\r\n\r\n   NEXTVAL<\/span>\r\n----------<\/span>\r\n         2<\/span>\r\n<\/code><\/pre>\n
3. \u9690\u5f0f\u7c7b\u578b\u8f6c\u6362<\/h2>\n
\u7531\u4e8ePostgreSQL\u57fa\u672c\u4e0a\u4e0d\u8fdb\u884c\u9690\u5f0f\u7c7b\u578b\u8f6c\u6362\uff0c\u6240\u4ee5\u9700\u8981\u6b63\u786e\u8fdb\u884c\u663e\u5f0f\u7c7b\u578b\u8f6c\u6362\u3002
\n\u4f8b\u5982\uff0c\u7c7b\u4f3c\u4e8e’1.00′ + 1\u7684\u64cd\u4f5c\u9700\u8981\u5bf9\u5b57\u7b26\u4e32\u8fdb\u884c\u8f6c\u6362\u3002<\/p>\n
><\/span> select<\/span> 1<\/span> +<\/span> '1.0'<\/span>\r\ninvalid<\/span> input<\/span> syntax<\/span> for<\/span> integer<\/span>:<\/span> \"1.0\"<\/span>\r\nLINE<\/span> 1<\/span>:<\/span> select<\/span> 1<\/span> +<\/span> '1.0'<\/span>\r\n<\/code><\/pre>\n
><\/span> select<\/span>\r\n\tcast<\/span>(<\/span>'1.00'<\/span> as<\/span> float<\/span>)<\/span> +<\/span> 1<\/span> as<\/span> float<\/span>\r\n,<\/span>\tcast<\/span>(<\/span>'1.00'<\/span> as<\/span> numeric<\/span>)<\/span> +<\/span> 1<\/span> as<\/span> numeric<\/span>\r\n,<\/span>\tcast<\/span>(<\/span>'1.00'<\/span> as<\/span> double<\/span> precision<\/span>)<\/span> +<\/span> 1<\/span> as<\/span> double<\/span>\r\n+<\/span>---------+-----------+----------+<\/span>\r\n|<\/span>   float<\/span> |<\/span> numeric<\/span>   |<\/span>   double<\/span> |<\/span>\r\n|<\/span>---------+-----------+----------|<\/span>\r\n|<\/span>       2<\/span> |<\/span> 2<\/span>.<\/span>00<\/span>      |<\/span>        2<\/span> |<\/span>\r\n+<\/span>---------+-----------+----------+<\/span>\r\n<\/code><\/pre>\n
\u7136\u800c\uff0c\u5982\u679c\u6ca1\u6709\u5c0f\u6570\u70b9\uff0cPostgreSQL\u4e5f\u4f1a\u8fdb\u884c\u9690\u5f0f\u7c7b\u578b\u8f6c\u6362\u3002\u5982\u679c\u4e0e\u6574\u6570\u7c7b\u578b\u5339\u914d\uff0c\u5219\u53ef\u4ee5\u4ece\u524d\u540e\u5de6\u53f3\u8fdb\u884c\u8fd0\u7b97\uff0c\u4e5f\u6ca1\u6709\u95ee\u9898\u3002<\/p>\n
><\/span> select<\/span> 1<\/span> +<\/span> '1'<\/span> +<\/span> 1<\/span>\r\n+<\/span>------------+<\/span>\r\n|<\/span>   ?<\/span>column<\/span>?<\/span> |<\/span>\r\n|<\/span>------------|<\/span>\r\n|<\/span>          3<\/span> |<\/span>\r\n+<\/span>------------+<\/span>\r\n<\/code><\/pre>\n
\u56e0\u4e3aOracle\u4f1a\u52aa\u529b\u5730\u8fdb\u884c\u9690\u5f0f\u7c7b\u578b\u8f6c\u6362\uff0c
\n\u6240\u4ee5\u65e0\u8bba\u5c0f\u6570\u70b9\u662f\u5426\u5b58\u5728\uff0c\u7cbe\u5ea6\u662f\u5426\u4e0d\u540c\uff0c\u5b83\u90fd\u4f1a\u8fdb\u884c\u8fd0\u7b97\u3002<\/p>\n
><\/span> select<\/span> 1<\/span> +<\/span>'1.00'<\/span> +<\/span> 1<\/span> as<\/span> result<\/span> from<\/span> dual<\/span>;<\/span>\r\n\r\n    RESULT<\/span>\r\n----------<\/span>\r\n         3<\/span>\r\n<\/code><\/pre>\n
4. \u6ca1\u6709to_single_byte\u51fd\u6570<\/h2>\n
\u5728PostgreSql\u4e2d\uff0c\u4f3c\u4e4e\u53ea\u80fd\u901a\u8fc7\u4f7f\u7528translate\u51fd\u6570\u8fdb\u884c\u66ff\u6362\u3002
\n\u8fd9\u53ea\u662f\u989d\u5916\u7684\u4e00\u70b9\u5de5\u4f5c\uff0c\u6240\u4ee5\u5e76\u4e0d\u4f1a\u5e26\u6765\u592a\u5927\u7684\u8d1f\u62c5\uff0c\u4f46\u5982\u679c\u8fd9\u662f\u6807\u51c6\u529f\u80fd\u7684\u8bdd\uff0c\u53ef\u80fd\u4f1a\u66f4\u52a0\u5f00\u5fc3\u3002<\/p>\n
><\/span> select<\/span> translate<\/span>(<\/span>'\uff11\uff12\uff13\uff14\uff15\uff16\uff17\uff18\uff19\u5186\u3067\u3059'<\/span>,<\/span> '\uff10\uff11\uff12\uff13\uff14\uff15\uff16\uff17\uff18\uff19'<\/span>,<\/span> '0123456789'<\/span>);<\/span>\r\n+<\/span>-----------------+<\/span>\r\n|<\/span> translate<\/span>       |<\/span>\r\n+<\/span>-----------------+<\/span>\r\n|<\/span> 123456789<\/span>\u5186\u3067\u3059<\/span> |<\/span>\r\n+<\/span>-----------------+<\/span>\r\n<\/code><\/pre>\n
\u987a\u4fbf\u63d0\u4e00\u4e0b\uff0c\u6211\u8fd8\u8bb0\u5f97\u7b2c\u4e00\u6b21\u4ece\u524d\u8f88\u90a3\u91cc\u5b66\u5230 to_single_byte \u51fd\u6570\u7684\u65f6\u5019\uff0c\u7531\u4e8e\u5b83\u592a\u65b9\u4fbf\u4e86\uff0c\u6211\u7684\u7075\u9b42\u90fd\u4e3a\u4e4b\u9707\u52a8\u4e86\u3002<\/p>\n
><\/span> select<\/span> to_single_byte<\/span>(<\/span>'\uff11\uff12\uff13\uff14\uff15\uff16\uff17\uff18\uff19\u5186\u3067\u3059'<\/span>)<\/span> from<\/span> dual<\/span>;<\/span>\r\n\r\nTO_SINGLE_BYTE<\/span>(<\/span>'\uff11\uff12\uff13\uff14\uff15\uff16\uff17\uff18\uff19\u5186\r\n------------------------------------\r\n123456789\u5186\u3067\u3059\r\n<\/span><\/code><\/pre>\n
5. \u6b63\u5219\u8868\u8fbe\u5f0f\u5728\u54ea\u53e5\u5b50\u4e2d\u7684\u4f7f\u7528<\/h2>\n
\u5982\u679c\u60a8\u60f3\u5728PostgreSQL\u4e2d\u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\u5bf9where\u5b50\u53e5\u8fdb\u884c\u8fc7\u6ee4\uff0c\u5b83\u4e0eOracle\u7684regexp_like\u4e0d\u540c\uff0c\u4f3c\u4e4e\u4f7f\u7528\u6ce2\u6d6a\u53f7\u4f5c\u4e3a\u66ff\u4ee3\u65b9\u6848\u3002
\n\u8fd9\u662f\u5e38\u89c1\u7684\u811a\u672c\u8bed\u8a00\u4e2d\u7684\u6b63\u5219\u8868\u8fbe\u5f0f\u8fd0\u7b97\u7b26\uff0c\u5f88\u5bb9\u6613\u7406\u89e3\uff0c\u800c\u4e14\u987a\u5e8f\u4e5f\u4e0d\u9519\u3002<\/p>\n
select<\/span> *<\/span> from<\/span> table_nm<\/span> where<\/span> title<\/span> ~<\/span> '[a-zA-Z]'<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u867d\u7136Oracle\u7684regexp_like\u4e5f\u6ca1\u6709\u95ee\u9898\uff0c\u4f46\u662f\u6709\u65f6\u4f1a\u4e00\u65f6\u5fd8\u8bb0\u5b83\u662f\u4e00\u4e2a\u51fd\u6570\u800c\u5e38\u5e38\u51fa\u9519\u3002\uff08\u4ee5\u4e3a\u5b83\u662f\u4e00\u4e2a\u540d\u4e3aregexp_like\u7684\u8fd0\u7b97\u7b26\u3002\u54c8\u54c8\uff09<\/p>\n
select<\/span> *<\/span> from<\/span> table_nm<\/span> where<\/span> regexp_like<\/span>(<\/span>column_nm<\/span>,<\/span> '[a-zA-Z]'<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u5728\u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\u8fdb\u884c\u5b57\u7b26\u4e32\u8fde\u63a5\u65f6\uff0c\u9700\u8981\u4f7f\u7528\u5706\u62ec\u53f7()\u8fdb\u884c\u62ec\u4f4f\u3002<\/h2>\n
\u5982\u679c\u60f3\u8981\u7528~\u8fd0\u7b97\u7b26\u751f\u6210\u8981\u5728\u5b57\u7b26\u4e32\u8fde\u63a5\u4e2d\u641c\u7d22\u7684\u6b63\u5219\u8868\u8fbe\u5f0f\uff0c\u9700\u8981\u7528\u5706\u62ec\u53f7()\u62ec\u8d77\u6765\u3002<\/p>\n
select<\/span> *<\/span> where<\/span> table_nm<\/span> where<\/span> column_nm1<\/span> ~<\/span> (<\/span>column_nm2<\/span> ||<\/span> '[0-9]+.*'<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u7528\u8fd9\u79cd\u65b9\u5f0f\u4f1a\u5bfc\u81f4\u8bed\u6cd5\u9519\u8bef\uff0c\u9519\u8bef\u6d88\u606f\u662f\u201cWHERE\u7684\u53c2\u6570\u5fc5\u987b\u662f\u5e03\u5c14\u7c7b\u578b\uff0c\u800c\u4e0d\u662f\u6587\u672c\u7c7b\u578b\u201d\u3002<\/p>\n
select<\/span> *<\/span> where<\/span> table_nm<\/span> where<\/span> column_nm1<\/span> ~<\/span> column_nm2<\/span> ||<\/span> '[0-9]+.*'<\/span>;<\/span>\r\n\r\nERROR<\/span>:<\/span>  argument<\/span> of<\/span> WHERE<\/span> must<\/span> be<\/span> type<\/span> boolean<\/span>,<\/span> not<\/span> type<\/span> text<\/span>\r\n<\/code><\/pre>\n
7. \u83b7\u53d6\u5f53\u524d\u65e5\u671f\u548c\u65f6\u95f4<\/h2>\n
\u5728PostgreSQL\u4e2d\uff0c\u6709\u591a\u79cd\u83b7\u53d6\u5f53\u524d\u65e5\u671f\u548c\u65f6\u95f4\u7684\u65b9\u6cd5\u3002
\n\u6700\u597d\u907f\u514d\u4f7f\u7528\u975e\u6807\u51c6\u7684now()\u51fd\u6570\uff0c\u800c\u662f\u4f7f\u7528current_xxx\u7cfb\u5217\u51fd\u6570\u4f1a\u66f4\u597d\u3002<\/p>\n
\u7531\u4e8e\u73b0\u5728()\u5b58\u5728\u4ee5\u4e0b\u6613\u9677\u5165\u56f0\u5883\u7684\u60c5\u51b5\uff0c\u9700\u8981\u6ce8\u610f\u3002<\/p>\n
\uff08\u6ce8\u610f\uff09PostgreSQL\u7684now()\u51fd\u6570\u8fd4\u56de\u4e8b\u52a1\u5f00\u59cb\u7684\u65f6\u95f4
\nhttps:\/\/siguniang.wordpress.com\/2013\/05\/17\/how-do-i-return-current-timestamp-with-postgresql\/<\/p><\/blockquote>\n
select<\/span> CURRENT_TIMESTAMP<\/span> as<\/span> now<\/span>\r\nunion<\/span> all<\/span> select<\/span> now<\/span>()<\/span> as<\/span> now<\/span> -- \u975e\u6a19\u6e96<\/span>\r\nunion<\/span> all<\/span> select<\/span> TIMESTAMP<\/span> 'now'<\/span> as<\/span> now<\/span>;<\/span>\r\n+<\/span>----------------------------------+<\/span>\r\n|<\/span> now<\/span>                              |<\/span>\r\n|<\/span>----------------------------------|<\/span>\r\n|<\/span> 2015<\/span>-<\/span>12<\/span>-<\/span>02<\/span> 17<\/span>:<\/span>21<\/span>:<\/span>32<\/span>.<\/span>889558<\/span>+<\/span>09<\/span>:<\/span>00<\/span> |<\/span>\r\n|<\/span> 2015<\/span>-<\/span>12<\/span>-<\/span>02<\/span> 17<\/span>:<\/span>21<\/span>:<\/span>32<\/span>.<\/span>889558<\/span>+<\/span>09<\/span>:<\/span>00<\/span> |<\/span>\r\n|<\/span> 2015<\/span>-<\/span>12<\/span>-<\/span>02<\/span> 17<\/span>:<\/span>21<\/span>:<\/span>32<\/span>.<\/span>889558<\/span>+<\/span>09<\/span>:<\/span>00<\/span> |<\/span>\r\n+<\/span>----------------------------------+<\/span>\r\n<\/code><\/pre>\n
\u5728Oracle\u4e2d\uff0c\u5373\u4f7f\u4e5f\u53ef\u4ee5\u4f7f\u7528CURRENT_TIMESTAMP\uff0c\u4f46\u662f\u6211\u4e60\u60ef\u4e8e\u4f7f\u7528sysdate\u3002<\/p>\n
><\/span> select<\/span> CURRENT_TIMESTAMP<\/span>  from<\/span> dual<\/span>\r\n  2<\/span>  union<\/span> all<\/span> select<\/span> sysdate<\/span> from<\/span> dual<\/span>\r\n  3<\/span>  ;<\/span>\r\nCURRENT_TIMESTAMP<\/span>\r\n----------------------------------------<\/span>\r\n15<\/span>-<\/span>12<\/span>-<\/span>02<\/span> 17<\/span>:<\/span>30<\/span>:<\/span>14<\/span>.<\/span>330000<\/span> +<\/span>09<\/span>:<\/span>00<\/span>\r\n15<\/span>-<\/span>12<\/span>-<\/span>02<\/span> 17<\/span>:<\/span>30<\/span>:<\/span>14<\/span>.<\/span>000000<\/span> +<\/span>09<\/span>:<\/span>00<\/span>\r\n<\/code><\/pre>\n
8. \u65f6\u95f4\u5dee\u5f02<\/h2>\n
\u5728PostgreSQL\u4e2d\u83b7\u53d6\u65e5\u671f\u6570\u636e\u5dee\u5f02\u7684\u65b9\u6cd5\u662f\u901a\u8fc7\u8ba1\u7b97\u65f6\u95f4\u6233\u4e4b\u95f4\u7684\u5dee\u6765\u83b7\u53d6\u65e5\u671f\u5dee\u5f02\uff0c\u56e0\u4e3aPostgreSQL\u4e2d\u6ca1\u6709DATEDIFF\u51fd\u6570\u3002<\/p>\n
\u67e5\u8be2\u4e2d\u51fd\u6570\u7684\u5d4c\u5957\u4f7f\u4e4b\u96be\u4ee5\u9605\u8bfb\uff0c\u4f46\u6309\u4ee5\u4e0b\u987a\u5e8f\u8fdb\u884c\u5904\u7406\u3002<\/p>\n
    \n
  1. \n
      \u4f7f\u7528to_timestamp\u51fd\u6570\u5c06\u65f6\u95f4\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u65f6\u95f4\u6233\u5e76\u53d6\u5dee\u5206\u3002<\/ol>\n<\/li>\n<\/ol>\n
       <\/p>\n
        \n
      1. \n
          \u4f7f\u7528to_char\u51fd\u6570\u5c06\u65f6\u95f4\u6233\u5dee\u5206\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\u3002<\/ol>\n<\/li>\n<\/ol>\n
           <\/p>\n
            \u7531\u4e8e\u4e0a\u8ff0\u6b65\u9aa4\u5e94\u8be5\u5f97\u5230\u4e86\u5206\u949f\u7684\u5dee\u5206\uff0c\u56e0\u6b64\u8fdb\u884ccast\u8f6c\u6362\u4e3a\u6570\u503c\u3002<\/ol>\n
            \u4ee5\u4e0b\u4ee511:45\u548c11:00\u4e4b\u95f4\u7684\u5dee\u5f02\u83b7\u53d6\u4e3a\u4f8b\u3002<\/p>\n
            ><\/span> select<\/span> cast<\/span>(<\/span>to_char<\/span>(<\/span>to_timestamp<\/span>(<\/span>'1145'<\/span>,<\/span> 'hh24mi'<\/span>)<\/span> -<\/span> to_timestamp<\/span>(<\/span>'1100'<\/span>,<\/span> 'hh24mi'<\/span>),<\/span> 'mi'<\/span>)<\/span> as<\/span> double<\/span> precision<\/span>);<\/span>\r\n+<\/span>-----------+<\/span>\r\n|<\/span> to_char<\/span>   |<\/span>\r\n|<\/span>-----------|<\/span>\r\n|<\/span> 45<\/span>        |<\/span>\r\n+<\/span>-----------+<\/span>\r\n<\/code><\/pre>\n
            \u7136\u800c\uff0c\u4e0a\u8ff0\u7684\u65b9\u6cd5\u65e0\u6cd5\u51c6\u786e\u83b7\u53d6\u8d85\u8fc71\u5c0f\u65f6\u7684\u5dee\u503c\uff0c\u4f8b\u598211:45\u548c10:00\u3002\u6211\u60f3\u83b7\u53d6\u7684\u503c\u662f105\u5206\u949f\uff0c\u4f46\u4e0d\u614e\u83b7\u53d6\u4e8645\u5206\u949f\u3002<\/p>\n
            gis<\/span>><\/span> select<\/span> cast<\/span>(<\/span>to_char<\/span>(<\/span>to_timestamp<\/span>(<\/span>'1145'<\/span>,<\/span> 'hh24mi'<\/span>)<\/span> -<\/span> to_timestamp<\/span>(<\/span>'1000'<\/span>,<\/span> 'hh24mi'<\/span>),<\/span> 'mi'<\/span>)<\/span> as<\/span> double<\/span> precision<\/span>);<\/span>\r\n+<\/span>-----------+<\/span>\r\n|<\/span>   to_char<\/span> |<\/span>\r\n|<\/span>-----------|<\/span>\r\n|<\/span>        45<\/span> |<\/span>\r\n+<\/span>-----------+<\/span>\r\nSELECT<\/span> 1<\/span>\r\nCommand<\/span> Time<\/span>:<\/span> 0<\/span>.<\/span>000<\/span>s<\/span>\r\n<\/code><\/pre>\n
            \u5bf9\u4e8e\u5c06\u8fd9\u4e2a\u8f6c\u6362\u4e3a\u6570\u5b57\u6211\u4e0d\u592a\u6e05\u695a\uff0c\u4f46\u4f3c\u4e4e\u4f7f\u7528\u63d0\u53d6epoc\u53ef\u4ee5\u5f88\u597d\u5730\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u3002\u4f7f\u7528\u5b83\u53ef\u4ee5\u6b63\u786e\u83b7\u53d6\u5230105\u5206\u949f\u3002<\/p>\n
            ><\/span> select<\/span> EXTRACT<\/span>(<\/span>EPOCH<\/span> FROM<\/span> to_timestamp<\/span>(<\/span>'1145'<\/span>,<\/span> 'hh24mi'<\/span>)<\/span> -<\/span> to_timestamp<\/span>(<\/span>'1000'<\/span>,<\/span> 'hh24mi'<\/span>))<\/span> \/<\/span> 60<\/span>;<\/span>\r\n+<\/span>------------+<\/span>\r\n|<\/span>   ?<\/span>column<\/span>?<\/span> |<\/span>\r\n|<\/span>------------|<\/span>\r\n|<\/span>        105<\/span> |<\/span>\r\n+<\/span>------------+<\/span>\r\nSELECT<\/span> 1<\/span>\r\n<\/code><\/pre>\n
            \u7531\u4e8eOracle\u7684Date\u7c7b\u578b\u5728\u6574\u6570\u90e8\u5206\u5b58\u50a8\u65e5\u671f\uff0c\u5c0f\u6570\u90e8\u5206\u5b58\u50a8\u65f6\u95f4\uff0c\u56e0\u6b64\u53ea\u9700\u63d0\u4f9b\u5c0f\u65f6\u00d7\u5206\u949f\u5373\u53ef\u3002
            \n\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528trunc\u51fd\u6570\u6765\u820d\u5f03\u5c0f\u6570\u90e8\u5206\u3002<\/p>\n
            ><\/span> select<\/span> trunc<\/span>(<\/span>to_number<\/span>(<\/span>to_date<\/span>(<\/span>'1145'<\/span>,<\/span> 'hh24mi'<\/span>)<\/span> -<\/span> to_date<\/span>(<\/span>'1000'<\/span>,<\/span> 'hh24mi'<\/span>))<\/span> *<\/span> 24<\/span> *<\/span> 60<\/span>)<\/span> as<\/span> diff<\/span> from<\/span> dual<\/span>;<\/span>\r\n      DIFF<\/span>\r\n----------<\/span>\r\n       105<\/span>\r\n<\/code><\/pre>\n
            9. \u6ca1\u6709\u5408\u5e76\u6587\u3002<\/h2>\n
            \u5c3d\u7ba1PostgreSQL\u9ed8\u8ba4\u4e0d\u652f\u6301Merge\u8bed\u53e5\uff0c\u4f46\u53ef\u4ee5\u901a\u8fc7\u5728update\u8bed\u53e5\u4e2d\u8bbe\u7f6efrom\/where\u5b50\u53e5\u6765\u5b9e\u73b0\u76f8\u540c\u7684\u529f\u80fd\u3002\u987a\u4fbf\u63d0\u4e00\u4e0b\uff0c\u6839\u636e\u89c4\u8303\uff0c\u5728set\u5b50\u53e5\u4e2d\u4e0d\u80fd\u4f7f\u7528\u8868\u522b\u540d\u3002\u5f53\u7136\uff0c\u5728where\u5b50\u53e5\u4e2d\u662f\u53ef\u4ee5\u8bbe\u7f6e\u7684\uff0c\u6240\u4ee5\u5728\u529f\u80fd\u4e0a\u6ca1\u6709\u95ee\u9898\u3002<\/p>\n
            update<\/span> \r\n\ttable_nm1<\/span> a<\/span> \r\nset<\/span>\r\n\tcolumn_nm1<\/span> =<\/span> column_nm2<\/span>  -- \u3053\u3053\u3067\u306f\u30c6\u30fc\u30d6\u30eb\u30a8\u30a4\u30ea\u30a2\u30b9\u306f\u4ed8\u4e0e\u3067\u304d\u306a\u3044<\/span>\r\nfrom<\/span>\r\n\ttable_nm2<\/span>  b<\/span>\r\nwhere<\/span>\r\n\ta<\/span>.<\/span>id<\/span> =<\/span> b<\/span>.<\/span>id<\/span>;<\/span>\r\n<\/code><\/pre>\n
            10. \u805a\u5408\u51fd\u6570\uff1a\u6309\u9017\u53f7\u5206\u9694\u8fdb\u884c\u805a\u5408<\/h2>\n
            \u8fd9\u662f\u65b9\u8a00\u5dee\u5f02\u7684\u95ee\u9898\u3002
            \nstring_agg\u4f3c\u4e4e\u662f\u4ecePostgreSQL 9.0\u5f00\u59cb\u5f15\u5165\u7684\u529f\u80fd\u3002
            \nhttp:\/\/lets.postgresql.jp\/documents\/technical\/9.0\/2<\/p>\n
            select<\/span>\r\n\tstring_agg<\/span>(<\/span>inv<\/span>.<\/span>col<\/span>,<\/span> ','<\/span>)<\/span>\r\nfrom<\/span> (<\/span>\r\n\tselect<\/span> '1'<\/span>\tas<\/span> col<\/span>\r\n\tunion<\/span> all<\/span> select<\/span> '2'<\/span>\tas<\/span> col<\/span>\r\n\tunion<\/span> all<\/span> select<\/span> '3'<\/span>\tas<\/span> col<\/span>\r\n)<\/span> inv<\/span>\r\n+<\/span>--------------+<\/span>\r\n|<\/span> string_agg<\/span>   |<\/span>\r\n|<\/span>--------------|<\/span>\r\n|<\/span> 1<\/span>,<\/span>2<\/span>,<\/span>3<\/span>        |<\/span>\r\n+<\/span>--------------+<\/span>\r\n<\/code><\/pre>\n
            \u5728Oracle\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528listagg\u51fd\u6570\u3002\u5373\u4f7f\u4e0d\u6307\u5b9a\u6392\u5e8f\u987a\u5e8f\uff0c\u4f7f\u7528within group\u5b50\u53e5\u4ecd\u662f\u5fc5\u9700\u7684\uff0c\u8fd9\u6709\u70b9\u9ebb\u70e6\u3002<\/p>\n
            ><\/span> select<\/span>\r\n  2<\/span>     listagg<\/span>(<\/span>inv<\/span>.<\/span>col<\/span>,<\/span> ','<\/span>)<\/span> within<\/span> group<\/span>(<\/span>order<\/span> by<\/span> null<\/span>)<\/span>\r\n  3<\/span>  from<\/span> (<\/span>\r\n  4<\/span>     select<\/span> '1'<\/span>      as<\/span> col<\/span> from<\/span> dual<\/span>\r\n  5<\/span>     union<\/span> all<\/span> select<\/span> '2'<\/span> as<\/span> col<\/span> from<\/span> dual<\/span>\r\n  6<\/span>     union<\/span> all<\/span> select<\/span> '3'<\/span> as<\/span> col<\/span> from<\/span> dual<\/span>\r\n  7<\/span>  )<\/span> inv<\/span>\r\n  8<\/span>  ;<\/span>\r\n\r\nLISTAGG<\/span>(<\/span>INV<\/span>.<\/span>COL<\/span>,<\/span>','<\/span>)<\/span>WITHINGROUP<\/span>(<\/span>ORDERBYNULL<\/span>)<\/span>\r\n----------------------------------------------------------<\/span>\r\n1<\/span>,<\/span>2<\/span>,<\/span>3<\/span>\r\n<\/code><\/pre>\n
            11. \u5982\u4f55\u4f7f\u7528last_value<\/h2>\n
            \u5982\u679c\u5728PostgreSQL\u4e2d\u4e0d\u7ed9last_value\u9009\u9879\u9002\u5f53\u7684\u503c\uff0c\u5b83\u5c06\u65e0\u6cd5\u76f4\u89c2\u5730\u5de5\u4f5c\u3002\u8ba9\u6211\u4eec\u5728\u5982\u4e0b\u8868\u683c\u4e2d\u8bd5\u4e00\u8bd5\u3002<\/p>\n
            +-------+-------+\r\n|   age | grp   |\r\n|-------+-------|\r\n|    15 | man   |\r\n|    20 | man   |\r\n|    22 | man   |\r\n|    17 | woman |\r\n|    25 | woman |\r\n+-------+-------+\r\n<\/code><\/pre>\n
            \u5f53\u5411\u8fd9\u4e2a\u95ee\u9898\u63d0\u4ea4\u4e0b\u5217\u67e5\u8be2\u65f6\uff0c\u65e0\u6cd5\u83b7\u53d6\u5230\u6240\u9700\u7684last_val_1\u503c\u3002
            \n\u4f3c\u4e4e\u9700\u8981\u5728last_value\u4e2d\u6307\u5b9aRANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING\u3002<\/p>\n
            \u6211\u5728\u8fd9\u91cc\u4e86\u89e3\u5230\u4e86\u539f\u56e0\u3002
            \nhttp:\/\/postd.cc\/window_functions_postgresql\/#10<\/p>\n
            \u6839\u636e\u9ed8\u8ba4\u8bbe\u7f6e\uff0cPostgreSQL\u7684\u7a97\u53e3\u6846\u67b6\u5305\u62ec\u201c\u4ece\u5206\u533a\u5f00\u5934\u5230\u5f53\u524d\u884c\u7684\u6700\u540e\u4e00\u884c\u201d\u3002\u8fd9\u53ef\u80fd\u4f1a\u5bfc\u81f4last_value\u548cnth_value\u4ea7\u751f\u4e0d\u7406\u60f3\u7684\u7ed3\u679c\u3002\u901a\u8fc7\u6307\u5b9a\u6570\u636e\u8303\u56f4\uff0c\u53ef\u4ee5\u907f\u514d\u8fd9\u4e2a\u95ee\u9898\uff0c\u5982\u4ee5\u4e0b\u793a\u4f8b\u6240\u793a\u3002<\/p><\/blockquote>\n
            select<\/span>\r\n   age<\/span>\r\n,<\/span>  grp<\/span>\r\n,<\/span>  last_value<\/span>(<\/span>age<\/span>)<\/span> over<\/span>(<\/span>partition<\/span> by<\/span> grp<\/span> order<\/span> by<\/span> age<\/span>)<\/span> as<\/span> last_val_1<\/span>  -- \u8aa4\u3063\u305f\u5024\u304c\u53d6\u5f97<\/span>\r\n,<\/span>  last_value<\/span>(<\/span>age<\/span>)<\/span> over<\/span>(<\/span>partition<\/span> by<\/span> grp<\/span> order<\/span> by<\/span> age<\/span> RANGE<\/span> BETWEEN<\/span> UNBOUNDED<\/span> PRECEDING<\/span> AND<\/span> UNBOUNDED<\/span> FOLLOWING<\/span>)<\/span> as<\/span> last_val_2<\/span>\r\nfrom<\/span> (<\/span>\r\n            select<\/span> '15'<\/span> as<\/span> age<\/span>,<\/span> 'man'<\/span> as<\/span> grp<\/span>\r\n  union<\/span> all<\/span> select<\/span> '20'<\/span> as<\/span> age<\/span>,<\/span> 'man'<\/span> as<\/span> grp<\/span>\r\n  union<\/span> all<\/span> select<\/span> '22'<\/span> as<\/span> age<\/span>,<\/span> 'man'<\/span> as<\/span> grp<\/span>\r\n  union<\/span> all<\/span> select<\/span> '17'<\/span> as<\/span> age<\/span>,<\/span> 'woman'<\/span> as<\/span> grp<\/span>\r\n  union<\/span> all<\/span> select<\/span> '25'<\/span> as<\/span> age<\/span>,<\/span> 'woman'<\/span> as<\/span> grp<\/span>\r\n  union<\/span> all<\/span> select<\/span> '30'<\/span> as<\/span> age<\/span>,<\/span> 'woman'<\/span> as<\/span> grp<\/span>\r\n)<\/span>  inv<\/span>\r\n;<\/span>\r\n+<\/span>-------+-------+--------------+--------------+<\/span>\r\n|<\/span>   age<\/span> |<\/span> grp<\/span>   |<\/span>   last_val_1<\/span> |<\/span>   last_val_2<\/span> |<\/span>\r\n|<\/span>-------+-------+--------------+--------------|<\/span>\r\n|<\/span>    15<\/span> |<\/span> man<\/span>   |<\/span>           15<\/span> |<\/span>           22<\/span> |<\/span>\r\n|<\/span>    20<\/span> |<\/span> man<\/span>   |<\/span>           20<\/span> |<\/span>           22<\/span> |<\/span>\r\n|<\/span>    22<\/span> |<\/span> man<\/span>   |<\/span>           22<\/span> |<\/span>           22<\/span> |<\/span>\r\n|<\/span>    17<\/span> |<\/span> woman<\/span> |<\/span>           17<\/span> |<\/span>           30<\/span> |<\/span>\r\n|<\/span>    25<\/span> |<\/span> woman<\/span> |<\/span>           25<\/span> |<\/span>           30<\/span> |<\/span>\r\n|<\/span>    30<\/span> |<\/span> woman<\/span> |<\/span>           30<\/span> |<\/span>           30<\/span> |<\/span>\r\n+<\/span>-------+-------+--------------+--------------+<\/span>\r\n<\/code><\/pre>\n
            \u4ee5\u4e0b\u94fe\u63a5\u63d0\u4f9b\u4e86\u4e00\u4e9b\u6709\u5173\u4e8edew_rank\u548crownumber\u7b49\u805a\u5408\u51fd\u6570\u7684\u884c\u4e3a\u7684\u53c2\u8003\u4fe1\u606f\uff1a
            \nhttp:\/\/postd.cc\/window_functions_postgresql\/#10<\/p>\n
            12. \u5bfc\u51fa\u4e3aCSV\u6587\u4ef6<\/h2>\n
            \u53ef\u4ee5\u4f7f\u7528\u590d\u5236\u547d\u4ee4\u5c06\u6570\u636e\u4ee5CSV\u683c\u5f0f\u5bfc\u51fa\u3002
            \n\u6587\u4ef6\u8def\u5f84\u5fc5\u987b\u662f\u53ef\u88abPostgreSQL\u8bbf\u95ee\u5230\u7684\u8def\u5f84\u3002<\/p>\n
            COPY<\/span> (<\/span>SELECT<\/span> *<\/span> FROM<\/span> table_nm<\/span>)<\/span> TO<\/span> '\/tmp\/output.csv'<\/span> DELIMITER<\/span> ','<\/span>\r\n<\/code><\/pre>\n
            13. \u6279\u91cf\u8d27\u8fd0<\/h2>\n
            copy\u51fd\u6570\u53ef\u4ee5\u6279\u91cf\u52a0\u8f7d\u6570\u636e\u3002
            \n\u5728from\u8bed\u53e5\u4e2d\u6307\u5b9a\u6587\u4ef6\u8def\u5f84\u3002
            \n\u5982\u679c\u5c06header\u9009\u9879\u8bbe\u7f6e\u4e3atrue\uff0c\u5b83\u5c06\u8bc6\u522bCSV\u7684\u7b2c\u4e00\u884c\u4e3a\u5217\u540d\u5e76\u81ea\u52a8\u8df3\u8fc7\u3002<\/p>\n
            COPY<\/span> table_nm<\/span>\r\n       FROM<\/span>\r\n           '\/var\/temp\/sample.csv'<\/span>\r\n       WITH<\/span>\r\n       (<\/span>\r\n           FORMAT<\/span> csv<\/span>,<\/span>\r\n           HEADER<\/span>  true<\/span>,<\/span>    -- \u30d8\u30c3\u30c0\u3042\u308a<\/span>\r\n           DELIMITER<\/span>  ','<\/span>,<\/span>\r\n           QUOTE<\/span>   '\"'<\/span>,<\/span>\r\n           ENCODING<\/span>  'UTF-8'<\/span>\r\n       );<\/span>\r\n<\/code><\/pre>\n
            \u6570\u636e\u5b9a\u4e49\u8bed\u8a00 (DDL)<\/h1>\n
            14. \u5217\u540d\u7684\u6700\u5927\u957f\u5ea6\u6ca1\u6709\u9650\u5236<\/h2>\n
            \u56e0\u4e3a\u5728Oracle\u4e2d\u6709\u4e00\u4e2a30\u4e2a\u5b57\u7b26\u7684\u9650\u5236\uff0c\u6240\u4ee5\u4f1a\u5f15\u53d1\u9519\u8bef\u3002
            \n\u7531\u4e8e\u8fd9\u4e2a\u9650\u5236\uff0c\u6709\u65f6\u6211\u4eec\u4f1a\u4f7f\u7528\u7701\u7565\u5143\u97f3\u7684\u6280\u5de7\uff0c\u4f46\u5728PostgreSQL\u4e2d\u5e76\u6ca1\u6709\u7cfb\u7edf\u4e0a\u7684\u9650\u5236\u3002
            \n\u5373\u4f7f\u5217\u540d\u8d85\u8fc760\u4e2a\u5b57\u7b26\u4e5f\u662f\u53ef\u4ee5\u7684\u3002<\/p>\n
            ><\/span> create<\/span> table<\/span> table_nm<\/span> (<\/span>abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890<\/span> integer<\/span>);<\/span>\r\nCREATE<\/span> TABLE<\/span>\r\nCommand<\/span> Time<\/span>:<\/span> 0<\/span>.<\/span>000<\/span>s<\/span>\r\nFormat<\/span> Time<\/span>:<\/span> 0<\/span>.<\/span>000<\/span>s<\/span>\r\n<\/code><\/pre>\n
            \u5f53\u60a8\u641c\u7d22\u5143\u6570\u636e\u65f6\uff0c\u5373\u4f7f\u8d85\u8fc760\u4e2a\u5b57\u7b26\u4e5f\u53ef\u4ee5\u3002<\/p>\n
            select<\/span>\r\n\tcolumn_name<\/span>\r\nfrom<\/span>\r\n\tinformation_schema<\/span>.<\/span>columns<\/span>\r\nwhere<\/span>\r\n\ttable_name<\/span> =<\/span>'table_nm'<\/span>\r\n;<\/span>\r\n+<\/span>----------------------------------------------------------------+-----------+<\/span>\r\n|<\/span> column_name<\/span>                                                    |<\/span> data_type<\/span> |<\/span>\r\n+<\/span>----------------------------------------------------------------+-----------+<\/span>\r\n|<\/span> abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz1234567890<\/span> |<\/span> integer<\/span>   |<\/span>\r\n+<\/span>----------------------------------------------------------------+-----------+<\/span>\r\n<\/code><\/pre>\n
            \u5728Oracle\u4e2d\u80af\u5b9a\u662f\u4e0d\u5141\u8bb8\u7684\u3002<\/p>\n
            ><\/span> create<\/span> table<\/span> table_nm<\/span> (<\/span>abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890<\/span> integer<\/span>);<\/span>\r\nError<\/span>\r\n[<\/span>row<\/span>:<\/span>1<\/span>,<\/span>col<\/span>:<\/span>20<\/span>]<\/span> ORA<\/span>-<\/span>00972<\/span>:<\/span> \u8b58\u5225\u5b50\u304c\u9577\u3059\u304e\u307e\u3059\u3002<\/span>\r\n<\/code><\/pre>\n
            15. \u6570\u503c\u578b\u7684\u5b9a\u4e49 de<\/h2>\n
            \u5728\u4f7f\u7528numeric(4, 2)\u65f6\uff0c\u53ea\u80fd\u5b58\u50a8\u523010\u76842\u6b21\u65b9\u3002
            \n\u800c\u5728\u4f7f\u7528numeric(4)\u65f6\uff0c\u53ef\u4ee5\u5b58\u50a8\u523010\u76844\u6b21\u65b9\u3002
            \n\u6211\u6ce8\u610f\u5230\uff0c\u7cbe\u5ea6\u7684\u6539\u53d8\u4f1a\u5f71\u54cd\u80fd\u591f\u5b58\u50a8\u7684\u6700\u5927\u503c\uff0c\u8fd9\u4e00\u70b9\u6211\u4e4b\u524d\u6ca1\u6709\u5bdf\u89c9\u5230\u3002<\/p>\n
            \u770b\u6765\u662f\u6211\u8bef\u89e3\u4e86\u3002\u6211\u5f97\u5230\u4e86\u8bc4\u8bba\u3002<\/p>\n
             <\/p>\n
            16. \u66f4\u6539\u5217\u7684\u4f4d\u6570<\/h2>\n
            \u4e0d\u9700\u8981\u4fee\u6539\u53e5\u5b50\u3002<\/p>\n
            alter<\/span> table<\/span> table_nm1<\/span> alter<\/span> column<\/span> column_nm1<\/span> type<\/span> varchar<\/span>(<\/span>15<\/span>);<\/span>\r\n<\/code><\/pre>\n
            \u6570\u636e\u5b57\u5178<\/h1>\n
            17. \u83b7\u53d6\u8868\u7684\u5143\u6570\u636e\u7684\u65b9\u5f0f<\/h2>\n
            \u4ece\u6570\u636e\u5e93\u7684\u5b57\u5178\u4e2d\u83b7\u53d6\u8868\u540d\u3001\u5217\u540d\u3001\u7c7b\u578b\u3001\u957f\u5ea6\u3001\u6ce8\u91ca\u7b49\u4fe1\u606f\u7684\u65b9\u6cd5\u662f\u5982\u4f55\u64cd\u4f5cPostgreSQL\u65f6\u6700\u56f0\u6270\u6211\u7684\u5730\u65b9\u4e4b\u4e00\u3002<\/p>\n
            \u53ef\u4ee5\u751f\u6210\u7528\u4e8e\u641c\u7d22\u7684\u8868\u3002
            \n\u53ef\u4ee5\u5728PostgreSQL\u6216Oracle\u4e0a\u751f\u6210\u3002<\/p>\n
            create<\/span> table<\/span> employee<\/span> (<\/span> \r\n   id<\/span>       char<\/span>(<\/span>5<\/span>)<\/span> \r\n,<\/span>  name<\/span>      varchar<\/span>(<\/span>64<\/span>)<\/span> \r\n,<\/span>  age<\/span>       numeric<\/span>(<\/span>3<\/span>,<\/span> 0<\/span>)<\/span> \r\n,<\/span>  sex_type<\/span>  char<\/span>(<\/span>1<\/span>)<\/span> \r\n,<\/span>  tel<\/span>       varchar<\/span>(<\/span>12<\/span>)<\/span> \r\n,<\/span>  primary<\/span> key<\/span>(<\/span>id<\/span>)<\/span> \r\n)<\/span>\r\n;<\/span>\r\nCOMMENT<\/span> ON<\/span> TABLE<\/span> employee<\/span> IS<\/span> '\u793e\u54e1\u30de\u30b9\u30bf\u30c6\u30fc\u30d6\u30eb'<\/span>;<\/span>\r\nCOMMENT<\/span> ON<\/span> COLUMN<\/span> employee<\/span>.<\/span>id<\/span> IS<\/span> '\u793e\u54e1ID'<\/span>;<\/span>\r\nCOMMENT<\/span> ON<\/span> COLUMN<\/span> employee<\/span>.<\/span>name<\/span> IS<\/span> '\u6c0f\u540d'<\/span>;<\/span>\r\nCOMMENT<\/span> ON<\/span> COLUMN<\/span> employee<\/span>.<\/span>age<\/span> IS<\/span> '\u5e74\u9f62'<\/span>;<\/span>\r\nCOMMENT<\/span> ON<\/span> COLUMN<\/span> employee<\/span>.<\/span>sex_type<\/span> IS<\/span> '\u6027\u5225\u533a\u5206'<\/span>;<\/span>\r\nCOMMENT<\/span> ON<\/span> COLUMN<\/span> employee<\/span>.<\/span>tel<\/span> IS<\/span> '\u96fb\u8a71\u756a\u53f7'<\/span>;<\/span>\r\n<\/code><\/pre>\n
            \u4f3c\u4e4e\u53ef\u4ee5\u4ecepg_catalog\u6a21\u5f0f\u6216information_schema\u83b7\u53d6PostgreSQL\u7684\u5b57\u5178\u3002
            \n\u7531\u4e8e\u540e\u8005\u7684information_schema\u66f4\u7b26\u5408SQL\u6807\u51c6\uff0c\u6211\u60f3\u5728\u90a3\u91cc\u5b8c\u6210\uff0c\u4f46\u662f\u8868\u6ce8\u91ca\u548c\u5217\u6ce8\u91ca\u53ea\u80fd\u4ecepg_catalog\u6a21\u5f0f\u83b7\u53d6\uff0c\u56e0\u6b64\u9700\u8981\u521b\u5efa\u6df7\u5408\u67e5\u8be2\u3002<\/p>\n
            SELECT<\/span>\r\n\tcol<\/span>.<\/span>table_schema<\/span>\r\n,<\/span>\tcol<\/span>.<\/span>table_name<\/span>\r\n,<\/span>\ttbl<\/span>.<\/span>description<\/span>\t\tas<\/span> table_comment<\/span>\r\n,<\/span>\tcol<\/span>.<\/span>ordinal_position<\/span>\r\n,<\/span>\tcol<\/span>.<\/span>column_name<\/span>\r\n,<\/span>\tpgd<\/span>.<\/span>description<\/span>\t\tas<\/span> column_comment<\/span>\r\n,<\/span>\tcol<\/span>.<\/span>data_type<\/span>\r\n,<\/span>\tcol<\/span>.<\/span>column_default<\/span>\r\n,<\/span>\tcol<\/span>.<\/span>is_nullable<\/span>\r\n,<\/span>\tcol<\/span>.<\/span>character_maximum_length<\/span>\r\n,<\/span>\tcol<\/span>.<\/span>numeric_precision<\/span>\r\n,<\/span>\tcol<\/span>.<\/span>numeric_precision_radix<\/span>\r\n,<\/span>\tcol<\/span>.<\/span>numeric_scale<\/span>\r\nFROM<\/span>\r\n\tpg_catalog<\/span>.<\/span>pg_statio_all_tables<\/span>\t\tsat<\/span>\r\n\tINNER<\/span> JOIN<\/span>\r\n\t\tpg_catalog<\/span>.<\/span>pg_description<\/span>\t\tpgd<\/span>\r\n\tON<\/span>\t(<\/span>\r\n\t\t\tpgd<\/span>.<\/span>objoid<\/span> \t\t\t=<\/span> sat<\/span>.<\/span>relid<\/span>\r\n\t\t)<\/span>\r\n\tINNER<\/span> JOIN<\/span>\r\n\t\tpg_catalog<\/span>.<\/span>pg_description<\/span>\t\ttbl<\/span>\r\n\tON<\/span>\t(<\/span>\r\n\t\t\ttbl<\/span>.<\/span>objoid<\/span>\t\t\t=<\/span> pgd<\/span>.<\/span>objoid<\/span>\r\n\t\tAND<\/span>\ttbl<\/span>.<\/span>objsubid<\/span>\t\t=<\/span> 0<\/span>\r\n\t)<\/span>\r\n\tINNER<\/span> JOIN<\/span>\r\n\t\tinformation_schema<\/span>.<\/span>columns<\/span>\tcol<\/span>\r\n\tON<\/span>\t(<\/span>\r\n\t\t\tcol<\/span>.<\/span>ordinal_position<\/span>=<\/span> pgd<\/span>.<\/span>objsubid<\/span>\r\n\t\tAND<\/span>\tcol<\/span>.<\/span>table_schema<\/span>\t=<\/span> sat<\/span>.<\/span>schemaname<\/span>\r\n\t\tAND<\/span>\tcol<\/span>.<\/span>table_name<\/span>\t\t=<\/span> sat<\/span>.<\/span>relname<\/span>\r\n\t\t)<\/span>\r\nWHERE<\/span> 1<\/span> =<\/span> 1<\/span>\r\nAND<\/span>\tcol<\/span>.<\/span>table_name<\/span>\t\t\t=<\/span> 'employee'<\/span>\r\nORDER<\/span> BY<\/span>\r\n\tcol<\/span>.<\/span>table_schema<\/span>\r\n\t,<\/span>col<\/span>.<\/span>table_name<\/span>\r\n\t,<\/span>col<\/span>.<\/span>ordinal_position<\/span>\r\n;<\/span>\r\n+<\/span>----------------+--------------+--------------------+--------------------+---------------+------------------+-------------------+------------------+---------------+----------------------------+---------------------+---------------------------+-----------------+<\/span>\r\n|<\/span> table_schema<\/span>   |<\/span> table_name<\/span>   |<\/span> table_comment<\/span>      |<\/span>   ordinal_position<\/span> |<\/span> column_name<\/span>   |<\/span> column_comment<\/span>   |<\/span> data_type<\/span>         |<\/span>   column_default<\/span> |<\/span> is_nullable<\/span>   |<\/span>   character_maximum_length<\/span> |<\/span>   numeric_precision<\/span> |<\/span>   numeric_precision_radix<\/span> |<\/span>   numeric_scale<\/span> |<\/span>\r\n|<\/span>----------------+--------------+--------------------+--------------------+---------------+------------------+-------------------+------------------+---------------+----------------------------+---------------------+---------------------------+-----------------|<\/span>\r\n|<\/span> public<\/span>         |<\/span> employee<\/span>     |<\/span> \u793e\u54e1\u30de\u30b9\u30bf\u30c6\u30fc\u30d6\u30eb<\/span> |<\/span>                  1<\/span> |<\/span> id<\/span>            |<\/span> \u793e\u54e1<\/span>ID<\/span>           |<\/span> character<\/span>         |<\/span>           <<\/span>null<\/span>><\/span> |<\/span> NO<\/span>            |<\/span>                          5<\/span> |<\/span>              <<\/span>null<\/span>><\/span> |<\/span>                    <<\/span>null<\/span>><\/span> |<\/span>          <<\/span>null<\/span>><\/span> |<\/span>\r\n|<\/span> public<\/span>         |<\/span> employee<\/span>     |<\/span> \u793e\u54e1\u30de\u30b9\u30bf\u30c6\u30fc\u30d6\u30eb<\/span> |<\/span>                  2<\/span> |<\/span> name<\/span>          |<\/span> \u6c0f\u540d<\/span>             |<\/span> character<\/span> varying<\/span> |<\/span>           <<\/span>null<\/span>><\/span> |<\/span> YES<\/span>           |<\/span>                         64<\/span> |<\/span>              <<\/span>null<\/span>><\/span> |<\/span>                    <<\/span>null<\/span>><\/span> |<\/span>          <<\/span>null<\/span>><\/span> |<\/span>\r\n|<\/span> public<\/span>         |<\/span> employee<\/span>     |<\/span> \u793e\u54e1\u30de\u30b9\u30bf\u30c6\u30fc\u30d6\u30eb<\/span> |<\/span>                  3<\/span> |<\/span> age<\/span>           |<\/span> \u5e74\u9f62<\/span>             |<\/span> numeric<\/span>           |<\/span>           <<\/span>null<\/span>><\/span> |<\/span> YES<\/span>           |<\/span>                     <<\/span>null<\/span>><\/span> |<\/span>                   3<\/span> |<\/span>                        10<\/span> |<\/span>               0<\/span> |<\/span>\r\n|<\/span> public<\/span>         |<\/span> employee<\/span>     |<\/span> \u793e\u54e1\u30de\u30b9\u30bf\u30c6\u30fc\u30d6\u30eb<\/span> |<\/span>                  4<\/span> |<\/span> sex_type<\/span>      |<\/span> \u6027\u5225\u533a\u5206<\/span>         |<\/span> character<\/span>         |<\/span>           <<\/span>null<\/span>><\/span> |<\/span> YES<\/span>           |<\/span>                          1<\/span> |<\/span>              <<\/span>null<\/span>><\/span> |<\/span>                    <<\/span>null<\/span>><\/span> |<\/span>          <<\/span>null<\/span>><\/span> |<\/span>\r\n|<\/span> public<\/span>         |<\/span> employee<\/span>     |<\/span> \u793e\u54e1\u30de\u30b9\u30bf\u30c6\u30fc\u30d6\u30eb<\/span> |<\/span>                  5<\/span> |<\/span> tel<\/span>           |<\/span> \u96fb\u8a71\u756a\u53f7<\/span>         |<\/span> character<\/span> varying<\/span> |<\/span>           <<\/span>null<\/span>><\/span> |<\/span> YES<\/span>           |<\/span>                         12<\/span> |<\/span>              <<\/span>null<\/span>><\/span> |<\/span>                    <<\/span>null<\/span>><\/span> |<\/span>          <<\/span>null<\/span>><\/span> |<\/span>\r\n+<\/span>----------------+--------------+--------------------+--------------------+---------------+------------------+-------------------+------------------+---------------+----------------------------+---------------------+---------------------------+-----------------+<\/span>\r\nSELECT<\/span> 5<\/span>\r\n<\/code><\/pre>\n
            \u5982\u679c\u5728Oracle\u7684\u60c5\u51b5\u4e0b\uff0c\u5982\u679c\u5728\u767b\u5f55\u7684\u6a21\u5f0f\u4e2d\uff0c\u5219\u53ef\u4ee5\u4ece\u4ee5user_\u5f00\u5934\u7684\u8868\u4e2d\u83b7\u53d6\u6570\u636e\u3002
            \n\u5982\u679c\u60f3\u8981\u8bbf\u95ee\u5176\u4ed6\u6a21\u5f0f\u7684\u8868\uff0c\u5219\u53ef\u4ee5\u4ece\u4ee5dba_\u5f00\u5934\u7684\u8868\u4e2d\u83b7\u53d6\u6570\u636e\u3002
            \n\u8fd9\u6b21\u6211\u4eec\u7279\u610f\u8bbf\u95ee\u4e86\u8303\u56f4\u66f4\u5e7f\u7684dba_\u7cfb\u5217\u5b57\u5178\u3002<\/p>\n
            -- \u30c6\u30fc\u30d6\u30eb\u306e\u30e1\u30bf\u60c5\u5831\u3092\u691c\u7d22<\/span>\r\nselect<\/span>\r\n\tcol<\/span>.<\/span>TABLE_NAME<\/span>\r\n,<\/span>\ttct<\/span>.<\/span>COMMENTS<\/span>\t\tas<\/span> table_comment<\/span>\r\n,<\/span>\tcol<\/span>.<\/span>COLUMN_NAME<\/span>\r\n,<\/span>\tcct<\/span>.<\/span>COMMENTS<\/span>\t\tas<\/span> column_comment<\/span>\r\n,<\/span>\tcol<\/span>.<\/span>DATA_TYPE<\/span>\r\n,<\/span>\tcol<\/span>.<\/span>DATA_LENGTH<\/span>\r\n,<\/span>\tcol<\/span>.<\/span>NULLABLE<\/span>\r\n,<\/span>\tcol<\/span>.<\/span>DATA_DEFAULT<\/span>\r\nfrom<\/span>\r\n\tDBA_TAB_COLUMNS<\/span>\t\tcol<\/span>\r\n,<\/span>\tDBA_TAB_COMMENTS<\/span>\ttct<\/span>\r\n,<\/span>\tDBA_COL_COMMENTS<\/span>\tcct<\/span>\r\nwhere<\/span> 1<\/span> =<\/span> 1<\/span>\r\nand<\/span>\tcol<\/span>.<\/span>OWNER<\/span>\t\t\t\t=<\/span> tct<\/span>.<\/span>OWNER<\/span>\r\nand<\/span>\tcol<\/span>.<\/span>TABLE_NAME<\/span>\t\t\t=<\/span> tct<\/span>.<\/span>TABLE_NAME<\/span>\r\nand<\/span>\ttct<\/span>.<\/span>OWNER<\/span>\t\t\t\t=<\/span> cct<\/span>.<\/span>OWNER<\/span>\r\nand<\/span>\ttct<\/span>.<\/span>TABLE_NAME<\/span>\t\t\t=<\/span> cct<\/span>.<\/span>TABLE_NAME<\/span>\r\nand<\/span>\tcol<\/span>.<\/span>COLUMN_NAME<\/span>\t\t\t=<\/span> cct<\/span>.<\/span>COLUMN_NAME<\/span>\r\nand<\/span>\tlower<\/span>(<\/span>col<\/span>.<\/span>OWNER<\/span>)<\/span>\t\t=<\/span> 'work_schema'<\/span>\t-- \u2605\u30b9\u30ad\u30fc\u30de\u540d\u3092\u6307\u5b9a<\/span>\r\nand<\/span>\tlower<\/span>(<\/span>col<\/span>.<\/span>TABLE_NAME<\/span>)<\/span>\t=<\/span> 'employee'<\/span>\t-- \u2605\u30c6\u30fc\u30d6\u30eb\u540d\u3092\u6307\u5b9a<\/span>\r\norder<\/span> by<\/span>\r\n\tcol<\/span>.<\/span>OWNER<\/span>\r\n,<\/span>\tcol<\/span>.<\/span>TABLE_NAME<\/span>\r\n,<\/span>\tcol<\/span>.<\/span>COLUMN_ID<\/span>\r\n;<\/span>\r\n\r\n-- \u5b9f\u884c\u7d50\u679c(Sqlplus\u3067\u306f\u4e0a\u624b\u304f\u8868\u793a\u3055\u308c\u306a\u304b\u3063\u305f\u306e\u3067\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u304c\u5c11\u3057\u7570\u306a\u308a\u307e\u3059)<\/span>\r\n+<\/span>--------+------------+--------------------+-------------+----------------+-----------+-------------+----------------+----------+--------------+<\/span>\r\n|<\/span> OWNER<\/span>       |<\/span> TABLE_NAME<\/span> |<\/span> TABLE_COMMENT<\/span>      |<\/span> COLUMN_NAME<\/span> |<\/span> COLUMN_COMMENT<\/span> |<\/span> DATA_TYPE<\/span> |<\/span> DATA_LENGTH<\/span> |<\/span> DATA_PRECISION<\/span> |<\/span> NULLABLE<\/span> |<\/span> DATA_DEFAULT<\/span> |<\/span>\r\n+<\/span>--------+------------+--------------------+-------------+----------------+-----------+-------------+----------------+----------+--------------+<\/span>\r\n|<\/span> work_schema<\/span> |<\/span> EMPLOYEE<\/span>   |<\/span> \u793e\u54e1\u30de\u30b9\u30bf\u30c6\u30fc\u30d6\u30eb<\/span> |<\/span> ID<\/span>          |<\/span> \u793e\u54e1<\/span>ID<\/span>         |<\/span> CHAR<\/span>      |<\/span> 20<\/span>          |<\/span>                |<\/span> N<\/span>        |<\/span>              |<\/span>\r\n+<\/span>--------+------------+--------------------+-------------+----------------+-----------+-------------+----------------+----------+--------------+<\/span>\r\n|<\/span> work_schema<\/span> |<\/span> EMPLOYEE<\/span>   |<\/span> \u793e\u54e1\u30de\u30b9\u30bf\u30c6\u30fc\u30d6\u30eb<\/span> |<\/span> NAME<\/span>        |<\/span> \u6c0f\u540d<\/span>           |<\/span> VARCHAR2<\/span>  |<\/span> 256<\/span>         |<\/span>                |<\/span> Y<\/span>        |<\/span>              |<\/span>\r\n+<\/span>--------+------------+--------------------+-------------+----------------+-----------+-------------+----------------+----------+--------------+<\/span>\r\n|<\/span> work_schema<\/span> |<\/span> EMPLOYEE<\/span>   |<\/span> \u793e\u54e1\u30de\u30b9\u30bf\u30c6\u30fc\u30d6\u30eb<\/span> |<\/span> AGE<\/span>         |<\/span> \u5e74\u9f62<\/span>           |<\/span> NUMBER<\/span>    |<\/span> 22<\/span>          |<\/span> 3<\/span>              |<\/span> Y<\/span>        |<\/span>              |<\/span>\r\n+<\/span>--------+------------+--------------------+-------------+----------------+-----------+-------------+----------------+----------+--------------+<\/span>\r\n|<\/span> work_schema<\/span> |<\/span> EMPLOYEE<\/span>   |<\/span> \u793e\u54e1\u30de\u30b9\u30bf\u30c6\u30fc\u30d6\u30eb<\/span> |<\/span> SEX_TYPE<\/span>    |<\/span> \u6027\u5225\u533a\u5206<\/span>       |<\/span> CHAR<\/span>      |<\/span> 4<\/span>           |<\/span>                |<\/span> Y<\/span>        |<\/span>              |<\/span>\r\n+<\/span>--------+------------+--------------------+-------------+----------------+-----------+-------------+----------------+----------+--------------+<\/span>\r\n|<\/span> work_schema<\/span> |<\/span> EMPLOYEE<\/span>   |<\/span> \u793e\u54e1\u30de\u30b9\u30bf\u30c6\u30fc\u30d6\u30eb<\/span> |<\/span> TEL<\/span>         |<\/span> \u96fb\u8a71\u756a\u53f7<\/span>       |<\/span> VARCHAR2<\/span>  |<\/span> 48<\/span>          |<\/span>                |<\/span> Y<\/span>        |<\/span>              |<\/span>\r\n+<\/span>--------+------------+--------------------+-------------+----------------+-----------+-------------+----------------+----------+--------------+<\/span>\r\n<\/code><\/pre>\n
            JDBC \u662f Java \u6570\u636e\u5e93\u8fde\u63a5\u7684\u7f29\u5199\u3002<\/h1>\n
            18. \u5927\u91cf\u7684SELECT\u64cd\u4f5c\u5bfc\u81f4\u5185\u5b58\u6ea2\u51fa<\/h2>\n
            \u867d\u7136\u6211\u6b63\u5728\u9010\u884c\u5904\u7406ResultSet\uff08\u800c\u4e0d\u662f\u4e00\u6b21\u6027\u5c06\u5176\u52a0\u8f7d\u5230\u5185\u5b58\u4e2d\uff09\uff0c\u4f46\u4ecd\u7136\u51fa\u73b0\u4e86OutOfMemory\u9519\u8bef\u3002
            \n\u901a\u8fc7\u6267\u884cexecuteQuery\u65b9\u6cd5\u65f6\uff0c\u4f3c\u4e4e\u5df2\u7ecf\u5c06\u6240\u6709\u7684\u6570\u636e\u52a0\u8f7d\u5230\u4e86\u5185\u5b58\u4e2d\u3002
            \n\u6211\u5df2\u7ecf\u8bbe\u7f6e\u4e86setFetchSize\uff0c\u4f46\u5b83\u4f3c\u4e4e\u6ca1\u6709\u8d77\u4f5c\u7528\uff0c\u6240\u4ee5\u4e00\u5f00\u59cb\u6211\u611f\u5230\u56f0\u60d1\u3002<\/p>\n
            package<\/span> example<\/span>;<\/span>\r\n\r\nimport<\/span> java.nio.charset.StandardCharsets<\/span>;<\/span>\r\nimport<\/span> java.nio.file.Files<\/span>;<\/span>\r\nimport<\/span> java.nio.file.Paths<\/span>;<\/span>\r\nimport<\/span> java.sql.Connection<\/span>;<\/span>\r\nimport<\/span> java.sql.DriverManager<\/span>;<\/span>\r\nimport<\/span> java.sql.PreparedStatement<\/span>;<\/span>\r\nimport<\/span> java.sql.ResultSet<\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> App<\/span> {<\/span>\r\n\r\n\tpublic<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> throws<\/span> Exception<\/span> {<\/span>\r\n\t\tClass<\/span>.<\/span>forName<\/span>(<\/span>\"org.postgresql.Driver\"<\/span>);<\/span>\r\n\t\tConnection<\/span> con<\/span> =<\/span> DriverManager<\/span>.<\/span>getConnection<\/span>(<\/span>\"jdbc:postgresql:\/\/<host>:<ip>\/<sid>\"<\/span>,<\/span> \"<user>\"<\/span>,<\/span> \"<pass>\"<\/span>);<\/span>\r\n\t\t\r\n\t\tPreparedStatement<\/span> stmt<\/span> =<\/span> con<\/span>.<\/span>prepareStatement<\/span>(<\/span>\"select * from large_size_table\"<\/span>);<\/span> \/\/ \u5927\u91cf\u4ef6\u6570\u306e\u30af\u30a8\u30ea<\/span>\r\n\t\tstmt<\/span>.<\/span>setFetchSize<\/span>(<\/span>1000<\/span>);<\/span>\r\n\t\t\r\n\t\tResultSet<\/span> rs<\/span> =<\/span> stmt<\/span>.<\/span>executeQuery<\/span>();<\/span>\r\n\t\twhile<\/span> (<\/span>rs<\/span>.<\/span>next<\/span>())<\/span> {<\/span>\r\n\t\t\tString<\/span> value1<\/span> =<\/span> rs<\/span>.<\/span>getString<\/span>(<\/span>\"column_nm1\"<\/span>);<\/span>\r\n\t\t\tString<\/span> value2<\/span> =<\/span> rs<\/span>.<\/span>getString<\/span>(<\/span>\"column_nm2\"<\/span>);<\/span>\r\n\t\t\tString<\/span> value3<\/span> =<\/span> rs<\/span>.<\/span>getString<\/span>(<\/span>\"column_nm3\"<\/span>);<\/span>\r\n\t\t\tSystem<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>value1<\/span> +<\/span> \",\"<\/span> +<\/span> value2<\/span> +<\/span> \",\"<\/span> +<\/span> value3<\/span>);<\/span>\r\n\t\t}<\/span>\r\n\r\n\t}<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
            \u5f53\u6267\u884c\u8be5\u64cd\u4f5c\u65f6\u4f1a\u51fa\u73b0\u5185\u5b58\u4e0d\u8db3\u7684\u9519\u8bef\u3002<\/p>\n
            Exception<\/span> in<\/span> thread<\/span> \"main\"<\/span> java<\/span>.<\/span>lang<\/span>.<\/span>OutOfMemoryError<\/span>:<\/span> Java<\/span> heap<\/span> space<\/span>\r\n\tat<\/span> java<\/span>.<\/span>lang<\/span>.<\/span>Class<\/span>.<\/span>getDeclaredFields0<\/span>(<\/span>Native<\/span> Method<\/span>)<\/span>\r\n\tat<\/span> java<\/span>.<\/span>lang<\/span>.<\/span>Class<\/span>.<\/span>privateGetDeclaredFields<\/span>(<\/span>Class<\/span>.<\/span>java<\/span>:<\/span>2583<\/span>)<\/span>\r\n\tat<\/span> java<\/span>.<\/span>lang<\/span>.<\/span>Class<\/span>.<\/span>getDeclaredField<\/span>(<\/span>Class<\/span>.<\/span>java<\/span>:<\/span>2068<\/span>)<\/span>\r\n\tat<\/span> java<\/span>.<\/span>util<\/span>.<\/span>concurrent<\/span>.<\/span>atomic<\/span>.<\/span>AtomicReferenceFieldUpdater<\/span>$AtomicReferenceFieldUpdaterImpl<\/span>$<\/span>1<\/span>.<\/span>run<\/span>(<\/span>AtomicReferenceFieldUpdater<\/span>.<\/span>java<\/span>:<\/span>316<\/span>)<\/span>\r\n\tat<\/span> java<\/span>.<\/span>util<\/span>.<\/span>concurrent<\/span>.<\/span>atomic<\/span>.<\/span>AtomicReferenceFieldUpdater<\/span>$AtomicReferenceFieldUpdaterImpl<\/span>$<\/span>1<\/span>.<\/span>run<\/span>(<\/span>AtomicReferenceFieldUpdater<\/span>.<\/span>java<\/span>:<\/span>314<\/span>)<\/span>\r\n\tat<\/span> java<\/span>.<\/span>security<\/span>.<\/span>AccessController<\/span>.<\/span>doPrivileged<\/span>(<\/span>Native<\/span> Method<\/span>)<\/span>\r\n\tat<\/span> java<\/span>.<\/span>util<\/span>.<\/span>concurrent<\/span>.<\/span>atomic<\/span>.<\/span>AtomicReferenceFieldUpdater<\/span>$AtomicReferenceFieldUpdaterImpl<\/span>.<<\/span>init<\/span>>(<\/span>AtomicReferenceFieldUpdater<\/span>.<\/span>java<\/span>:<\/span>313<\/span>)<\/span>\r\n\tat<\/span> java<\/span>.<\/span>util<\/span>.<\/span>concurrent<\/span>.<\/span>atomic<\/span>.<\/span>AtomicReferenceFieldUpdater<\/span>.<\/span>newUpdater<\/span>(<\/span>AtomicReferenceFieldUpdater<\/span>.<\/span>java<\/span>:<\/span>109<\/span>)<\/span>\r\n\tat<\/span> java<\/span>.<\/span>sql<\/span>.<\/span>SQLException<\/span>.<<\/span>clinit<\/span>>(<\/span>SQLException<\/span>.<\/span>java<\/span>:<\/span>372<\/span>)<\/span>\r\n\tat<\/span> org<\/span>.<\/span>postgresql<\/span>.<\/span>core<\/span>.<\/span>v3<\/span>.<\/span>QueryExecutorImpl<\/span>.<\/span>processResults<\/span>(<\/span>QueryExecutorImpl<\/span>.<\/span>java<\/span>:<\/span>1817<\/span>)<\/span>\r\n\tat<\/span> org<\/span>.<\/span>postgresql<\/span>.<\/span>core<\/span>.<\/span>v3<\/span>.<\/span>QueryExecutorImpl<\/span>.<\/span>execute<\/span>(<\/span>QueryExecutorImpl<\/span>.<\/span>java<\/span>:<\/span>257<\/span>)<\/span>\r\n\tat<\/span> org<\/span>.<\/span>postgresql<\/span>.<\/span>jdbc2<\/span>.<\/span>AbstractJdbc2Statement<\/span>.<\/span>execute<\/span>(<\/span>AbstractJdbc2Statement<\/span>.<\/span>java<\/span>:<\/span>500<\/span>)<\/span>\r\n\tat<\/span> org<\/span>.<\/span>postgresql<\/span>.<\/span>jdbc2<\/span>.<\/span>AbstractJdbc2Statement<\/span>.<\/span>executeWithFlags<\/span>(<\/span>AbstractJdbc2Statement<\/span>.<\/span>java<\/span>:<\/span>388<\/span>)<\/span>\r\n\tat<\/span> org<\/span>.<\/span>postgresql<\/span>.<\/span>jdbc2<\/span>.<\/span>AbstractJdbc2Statement<\/span>.<\/span>executeQuery<\/span>(<\/span>AbstractJdbc2Statement<\/span>.<\/span>java<\/span>:<\/span>273<\/span>)<\/span>\r\n\tat<\/span> tig<\/span>.<\/span>exp<\/span>.<\/span>App<\/span>.<\/span>main<\/span>(<\/span>App<\/span>.<\/span>java<\/span>:<\/span>37<\/span>)<\/span>\r\n<\/code><\/pre>\n
            \u901a\u8fc7\u5c06 Connection#setAutoCommit \u8bbe\u7f6e\u4e3a false \u6765\u5b9e\u73b0\u4e86\u907f\u514d\u3002\u56e0\u4e3a\u6211\u53ea\u662f\u60f3\u8981\u8fdb\u884c\u6570\u636e\u5e93\u7684\u67e5\u8be2\uff0c\u6240\u4ee5\u4e00\u5f00\u59cb\u5e76\u6ca1\u6709\u8fdb\u884c\u8bbe\u7f6e\u3002\u4f46\u662f\u5982\u679c\u4e0d\u8bbe\u7f6e\u7684\u8bdd\uff0cStatement#setFetchSize \u7684\u8bbe\u7f6e\u4f1a\u88ab\u7981\u7528\uff0c\u800c\u4e14\u4f3c\u4e4e\u662f\u4f1a\u4fdd\u7559\u6240\u6709\u8bb0\u5f55\u7684\u89c4\u683c\u3002<\/p>\n
            \t\tConnection<\/span> con<\/span> =<\/span> DriverManager<\/span>.<\/span>getConnection<\/span>(<\/span>\"jdbc:postgresql:\/\/<host>:<ip>\/<sid>\"<\/span>,<\/span> \"<user>\"<\/span>,<\/span> \"<pass>\"<\/span>);<\/span>\r\n\t\tcon<\/span>.<\/span>setAutoCommit<\/span>(<\/span>false<\/span>);<\/span>\r\n<\/code><\/pre>\n
            \u5f53\u8bbe\u7f6eStatement\u7684fetchSize\u65f6\uff0c\u6211\u4eec\u53d1\u73b0\u5728\u8bbe\u7f6econ.setAutoCommit(false)\u4ee5\u53castmt.setFetchSize(Integer.MAX_VALUE)\u7b49\u53c2\u6570\u540e\uff0c\u6b63\u5982\u9884\u671f\u7684\u90a3\u6837\uff0c\u5b83\u80fd\u591f\u6709\u6548\u5730\u907f\u514dOutOfMemory\u9519\u8bef\u3002<\/p>\n
            \u6700\u7d42\u7ed3\u679c\u662f<\/h1>\n
            \u4f7f\u7528Oracle\u7ea63\u30014\u5e74\uff0c\u4f46\u5728\u529f\u80fd\u65b9\u9762\uff0c\u5373\u4f7f\u5728\u4f7f\u7528PostgreSQL\u65f6\u4e5f\u6ca1\u6709\u9047\u5230\u4ec0\u4e48\u5927\u95ee\u9898\uff0c\u53ef\u4ee5\u987a\u5229\u4f7f\u7528\u3002<\/p>\n
            \u6bd5\u7adf\uff0c\u5b83\u53ea\u662f\u4e00\u79cdSQL\u6846\u67b6\uff0c\u6ca1\u6709\u50cf\u8fc7\u7a0b\u5f0f\u8bed\u8a00\u90a3\u6837\u4e30\u5bcc\u591a\u6837\uff0c\u6240\u4ee5\u6211\u60f3\u7ee7\u7eed\u4f7f\u7528\u800c\u4e0d\u4f1a\u592a\u5728\u610f\u3002<\/p>\n
            \u975e\u529f\u80fd\u5dee\u5f02\u65b9\u9762\uff0c\u50cfPgCon\u7684\u8d44\u6599\u4f3c\u4e4e\u5f88\u6709\u8da3\u3002\u8fd9\u662f\u4e00\u4efd\u5f88\u68d2\u7684\u8d44\u6599\u3002
            \nhttps:\/\/www.pgecons.org\/<\/p>\n","protected":false},"excerpt":{"rendered":"
            \u9996\u5148 \u901a\u8fc7\u5728PostgreSQL\u4e2d\u8fdb\u884c\u805a\u5408\u548c\u5206\u6790\u6570\u767e\u4e07\u6761\u6570\u636e\u7684\u5de5\u4f5c\uff0c\u6211\u4eec\u603b\u7ed3\u51fa\u4ee5\u4e0b\u7684\u7ecf\u9a8c\u3002\u6211\u4eec\u6839\u636e\u611f\u89c9\u5230\u7684\u5dee\u8ddd […]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-42170","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\n\u6211\u5bf9\u5b66\u4e60PostgreSQL\u768418\u4e2a\u5dee\u8ddd\u7684\u521d\u6b65\u611f\u53d7 - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/\u6211\u5bf9\u5b66\u4e60postgresql\u768418\u4e2a\u5dee\u8ddd\u7684\u521d\u6b65\u611f\u53d7\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u6211\u5bf9\u5b66\u4e60PostgreSQL\u768418\u4e2a\u5dee\u8ddd\u7684\u521d\u6b65\u611f\u53d7\" \/>\n<meta property=\"og:description\" content=\"\u9996\u5148 \u901a\u8fc7\u5728PostgreSQL\u4e2d\u8fdb\u884c\u805a\u5408\u548c\u5206\u6790\u6570\u767e\u4e07\u6761\u6570\u636e\u7684\u5de5\u4f5c\uff0c\u6211\u4eec\u603b\u7ed3\u51fa\u4ee5\u4e0b\u7684\u7ecf\u9a8c\u3002\u6211\u4eec\u6839\u636e\u611f\u89c9\u5230\u7684\u5dee\u8ddd […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/\u6211\u5bf9\u5b66\u4e60postgresql\u768418\u4e2a\u5dee\u8ddd\u7684\u521d\u6b65\u611f\u53d7\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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