{"id":31647,"date":"2022-12-12T08:45:57","date_gmt":"2023-12-14T03:26:10","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8java%e8%bf%9e%e6%8e%a5%e5%88%b0postgresql%e6%95%b0%e6%8d%ae%e5%ba%93\/"},"modified":"2024-04-29T04:54:30","modified_gmt":"2024-04-28T20:54:30","slug":"%e4%bd%bf%e7%94%a8java%e8%bf%9e%e6%8e%a5%e5%88%b0postgresql%e6%95%b0%e6%8d%ae%e5%ba%93","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8java%e8%bf%9e%e6%8e%a5%e5%88%b0postgresql%e6%95%b0%e6%8d%ae%e5%ba%93\/","title":{"rendered":"\u4f7f\u7528Java\u8fde\u63a5\u5230PostgreSQL\u6570\u636e\u5e93"},"content":{"rendered":"<h1>\u9996\u5148<\/h1>\n<p>\u7531\u4e8e\u6700\u8fd1\u63a5\u89e6\u5404\u79cd\u7a0b\u5e8f\u8fde\u63a5\u5230PostgreSQL\u7684\u673a\u4f1a\u589e\u591a\uff0c\u6240\u4ee5\u6211\u6574\u7406\u4e86\u4e00\u4e0b\u6b65\u9aa4\u3002<br \/>\n\u7531\u4e8e\u7bc7\u5e45\u8f83\u957f\uff0c\u672c\u6b21\u5c06\u5c1d\u8bd5\u8fde\u63a5Java\u548cPostgreSQL\u3002<br \/>\n\u6b64\u5916\uff0c\u672c\u6587\u5305\u542b\u4e86\u572812\/16\uff08\u516d\uff09\u4e3e\u529e\u7684PostgreSQL\u975e\u5b98\u65b9\u4f1a\u8bae\u4e0a\u7684\u6f14\u8bb2\u5185\u5bb9\u3002<br \/>\n\u5f53\u5929\u7684\u8d44\u6599\u53ef\u4ee5\u5728\u8fd9\u91cc\u67e5\u770b\u3002<\/p>\n<p>[2018\/11\/20\u66f4\u65b0]<br \/>\n\u6211\u5df2\u7ecf\u53d1\u5e03\u4e86\u4e00\u7bc7\u5173\u4e8eC#\u7684\u6587\u7ae0\uff0c\u5bf9\u5f53\u5929\u516c\u5e03\u7684\u5185\u5bb9\u505a\u4e86\u4e00\u4e9b\u989d\u5916\u7684\u8865\u5145\u3002<br \/>\n\u5982\u679c\u60a8\u60f3\u4e86\u89e3\u6709\u5173C#\u8fde\u63a5\u65b9\u6cd5\u7684\u4fe1\u606f\uff0c\u8bf7\u53c2\u9605\u90a3\u7bc7\u6587\u7ae0\u3002<\/p>\n<p>[2019\/2\/20\u4fee\u6b63\u53ca\u8ffd\u52a0]<br \/>\n\u611f\u8b1d@takuya-fujiwara\u63d0\u4f9b\u7684\u8bc4\u8bba\uff0c\u6211\u4fee\u6539\u4e86JDBC\u9a71\u52a8\u7a0b\u5e8f\u7684\u52a0\u8f7d\u90e8\u5206\u3002<br \/>\n\u975e\u5e38\u611f\u8c22\u60a8\u7684\u6307\u6b63\u3002<br \/>\n\u5173\u4e8e\u4fee\u6b63\u7684\u8be6\u7ec6\u4fe1\u606f\uff0c\u8bf7\u53c2\u9605\u8ffd\u52a0\u5185\u5bb9\u3002<\/p>\n<h1>\u8fde\u63a5Java\u5230PostgreSQL\u3002<\/h1>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u74b0\u5883\u60c5\u5831<\/ul>\n<\/li>\n<\/ul>\n<p>OS:Windows 10<br \/>\nPostgreSQL: 10.1<br \/>\nJava\uff1a1.8<br \/>\nJDBC\uff1a4.2<\/p>\n<p>\u9996\u5148\uff0c\u5047\u8bbePostgreSQL\u548cJava\u7684\u73af\u5883\u5df2\u7ecf\u5b89\u88c5\u597d\u3002<br \/>\n\u8981\u4eceJava\u8fde\u63a5\u5230PostgreSQL\uff0c\u9996\u5148\u9700\u8981\u83b7\u53d6PostgreSQL\u7684JDBC\u9a71\u52a8\u7a0b\u5e8f\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">PostgreSQL JDBC Driver<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">https:\/\/jdbc.postgresql.org\/download.html<\/ul>\n<p>\u5728Eclipse\u4e2d\uff0c\u53f3\u952e\u5355\u51fb\u8981\u521b\u5efa\u7684\u9879\u76ee\u5e76\u9009\u62e9&#8221;\u6784\u5efa\u8def\u5f84&#8221; -&gt; &#8220;\u914d\u7f6e\u6784\u5efa\u8def\u5f84&#8221;\u3002<br \/>\n\u7136\u540e\uff0c\u5728&#8221;\u5e93&#8221;\u9009\u9879\u5361\u4e2d\u9009\u62e9&#8221;\u6dfb\u52a0\u5916\u90e8JAR&#8221;\uff0c\u5e76\u6dfb\u52a0\u4ece\u4e0a\u8ff0\u6765\u6e90\u83b7\u53d6\u7684PostgreSQL JDBC\u3002<\/p>\n<p>\u7136\u540e\uff0c\u6211\u5199\u4e0b\u4e86\u4ee5\u4e0b\u4ee3\u7801\u4ee5\u8fde\u63a5\u5230PostgreSQL\u3002<br \/>\n\u4f5c\u4e3a\u6d4b\u8bd5\uff0c\u6211\u4eec\u5c06\u6267\u884cSELECT\u548cINSERT\u8bed\u53e5\u7684\u4e8b\u52a1\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kn\">import<\/span> <span class=\"nn\">java.sql.Connection<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">java.sql.DriverManager<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">java.sql.ResultSet<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">java.sql.SQLException<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">java.sql.Statement<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Sample_pos_conn<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"nc\">Connection<\/span> <span class=\"n\">conn<\/span> <span class=\"o\">=<\/span> <span class=\"kc\">null<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"nc\">Statement<\/span> <span class=\"n\">stmt<\/span> <span class=\"o\">=<\/span> <span class=\"kc\">null<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"nc\">ResultSet<\/span> <span class=\"n\">rset<\/span> <span class=\"o\">=<\/span> <span class=\"kc\">null<\/span><span class=\"o\">;<\/span>\r\n\r\n        <span class=\"c1\">\/\/\u63a5\u7d9a\u6587\u5b57\u5217<\/span>\r\n        <span class=\"nc\">String<\/span> <span class=\"n\">url<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"jdbc:postgresql:\/\/123.45.67.89:5432\/postgres\"<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"nc\">String<\/span> <span class=\"n\">user<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"postgres\"<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"nc\">String<\/span> <span class=\"n\">password<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"password\"<\/span><span class=\"o\">;<\/span>\r\n\r\n        <span class=\"k\">try<\/span><span class=\"o\">{<\/span>\r\n            <span class=\"c1\">\/\/PostgreSQL\u3078\u63a5\u7d9a<\/span>\r\n            <span class=\"n\">conn<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">DriverManager<\/span><span class=\"o\">.<\/span><span class=\"na\">getConnection<\/span><span class=\"o\">(<\/span><span class=\"n\">url<\/span><span class=\"o\">,<\/span> <span class=\"n\">user<\/span><span class=\"o\">,<\/span> <span class=\"n\">password<\/span><span class=\"o\">);<\/span>\r\n\r\n            <span class=\"c1\">\/\/\u81ea\u52d5\u30b3\u30df\u30c3\u30c8OFF<\/span>\r\n            <span class=\"n\">conn<\/span><span class=\"o\">.<\/span><span class=\"na\">setAutoCommit<\/span><span class=\"o\">(<\/span><span class=\"kc\">false<\/span><span class=\"o\">);<\/span>\r\n\r\n            <span class=\"c1\">\/\/SELECT\u6587\u306e\u5b9f\u884c<\/span>\r\n            <span class=\"n\">stmt<\/span> <span class=\"o\">=<\/span> <span class=\"n\">conn<\/span><span class=\"o\">.<\/span><span class=\"na\">createStatement<\/span><span class=\"o\">();<\/span>\r\n            <span class=\"nc\">String<\/span> <span class=\"n\">sql<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"SELECT 1\"<\/span><span class=\"o\">;<\/span>\r\n            <span class=\"n\">rset<\/span> <span class=\"o\">=<\/span> <span class=\"n\">stmt<\/span><span class=\"o\">.<\/span><span class=\"na\">executeQuery<\/span><span class=\"o\">(<\/span><span class=\"n\">sql<\/span><span class=\"o\">);<\/span>\r\n\r\n            <span class=\"c1\">\/\/SELECT\u7d50\u679c\u306e\u53d7\u3051\u53d6\u308a<\/span>\r\n            <span class=\"k\">while<\/span><span class=\"o\">(<\/span><span class=\"n\">rset<\/span><span class=\"o\">.<\/span><span class=\"na\">next<\/span><span class=\"o\">()){<\/span>\r\n                <span class=\"nc\">String<\/span> <span class=\"n\">col<\/span> <span class=\"o\">=<\/span> <span class=\"n\">rset<\/span><span class=\"o\">.<\/span><span class=\"na\">getString<\/span><span class=\"o\">(<\/span><span class=\"mi\">1<\/span><span class=\"o\">);<\/span>\r\n                <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"n\">col<\/span><span class=\"o\">);<\/span>\r\n            <span class=\"o\">}<\/span>\r\n\r\n            <span class=\"c1\">\/\/INSERT\u6587\u306e\u5b9f\u884c<\/span>\r\n            <span class=\"n\">sql<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"INSERT INTO jdbc_test VALUES (1, 'AAA')\"<\/span><span class=\"o\">;<\/span>\r\n            <span class=\"n\">stmt<\/span><span class=\"o\">.<\/span><span class=\"na\">executeUpdate<\/span><span class=\"o\">(<\/span><span class=\"n\">sql<\/span><span class=\"o\">);<\/span>\r\n            <span class=\"n\">conn<\/span><span class=\"o\">.<\/span><span class=\"na\">commit<\/span><span class=\"o\">();<\/span>\r\n        <span class=\"o\">}<\/span>\r\n        <span class=\"k\">catch<\/span> <span class=\"o\">(<\/span><span class=\"nc\">SQLException<\/span> <span class=\"n\">e<\/span><span class=\"o\">){<\/span>\r\n            <span class=\"n\">e<\/span><span class=\"o\">.<\/span><span class=\"na\">printStackTrace<\/span><span class=\"o\">();<\/span>\r\n        <span class=\"o\">}<\/span>\r\n        <span class=\"k\">finally<\/span> <span class=\"o\">{<\/span>\r\n            <span class=\"k\">try<\/span> <span class=\"o\">{<\/span>\r\n                <span class=\"k\">if<\/span><span class=\"o\">(<\/span><span class=\"n\">rset<\/span> <span class=\"o\">!=<\/span> <span class=\"kc\">null<\/span><span class=\"o\">)<\/span><span class=\"n\">rset<\/span><span class=\"o\">.<\/span><span class=\"na\">close<\/span><span class=\"o\">();<\/span>\r\n                <span class=\"k\">if<\/span><span class=\"o\">(<\/span><span class=\"n\">stmt<\/span> <span class=\"o\">!=<\/span> <span class=\"kc\">null<\/span><span class=\"o\">)<\/span><span class=\"n\">stmt<\/span><span class=\"o\">.<\/span><span class=\"na\">close<\/span><span class=\"o\">();<\/span>\r\n                <span class=\"k\">if<\/span><span class=\"o\">(<\/span><span class=\"n\">conn<\/span> <span class=\"o\">!=<\/span> <span class=\"kc\">null<\/span><span class=\"o\">)<\/span><span class=\"n\">conn<\/span><span class=\"o\">.<\/span><span class=\"na\">close<\/span><span class=\"o\">();<\/span>\r\n            <span class=\"o\">}<\/span>\r\n            <span class=\"k\">catch<\/span> <span class=\"o\">(<\/span><span class=\"nc\">SQLException<\/span> <span class=\"n\">e<\/span><span class=\"o\">){<\/span>\r\n                <span class=\"n\">e<\/span><span class=\"o\">.<\/span><span class=\"na\">printStackTrace<\/span><span class=\"o\">();<\/span>\r\n            <span class=\"o\">}<\/span>\r\n\r\n        <span class=\"o\">}<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>\u6211\u4f1a\u4f9d\u6b21\u89e3\u91ca\u4e0a\u9762\u4ee3\u7801\u4e2d\u7684\u5173\u952e\u90e8\u5206\u3002<\/p>\n<h2>\u8fde\u63a5\u81f3PostgreSQL\u6570\u636e\u5e93<\/h2>\n<p>\u660e\u786e\u6307\u5b9a\u8981\u8fde\u63a5\u7684\u6570\u636e\u5e93\u3002<br \/>\n\u8fd9\u662f\u8fde\u63a5\u5230PostgreSQL\u7684\u60c5\u51b5\uff08\u5b57\u7b26\u4e32\u4e2d\u5305\u542b\u4e86\u201cpostgres\u201d\u4e4b\u7c7b\u7684\uff09\u3002<br \/>\n\u56e0\u6b64\uff0c\u5982\u679c\u8981\u8fde\u63a5\u5176\u4ed6\u6570\u636e\u5e93\uff0c\u5b57\u7b26\u4e32\u5f53\u7136\u662f\u4e0d\u540c\u7684\u3002<br \/>\n\u6362\u53e5\u8bdd\u8bf4\uff0c\u53ea\u8981\u91cd\u65b0\u89e3\u91ca\u8fde\u63a5\u76f8\u5173\u5b57\u7b26\u4e32\uff0c\u5bf9\u4e8e\u76f8\u540c\u7684RDBMS\uff0c\u53ef\u4ee5\u7528JDBC\u505a\u7684\u4e8b\u60c5\u548c\u884c\u4e3a\u662f\u7c7b\u4f3c\u7684\u3002<\/p>\n<h3>\u94fe\u63a5\u5b57\u7b26\u4e32<\/h3>\n<pre class=\"post-pre\"><code><span class=\"nc\">String<\/span> <span class=\"n\">url<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"jdbc:postgresql:\/\/&lt;\u63a5\u7d9a\u5148DB\u30b5\u30fc\u30d0\u306eIP or \u30db\u30b9\u30c8\u540d&gt;:&lt;DB\u306e\u30dd\u30fc\u30c8\u756a\u53f7&gt;\/&lt;DB\u540d&gt;\"<\/span><span class=\"o\">;<\/span>\r\n<\/code><\/pre>\n<p>\u4ee5\u4e0b\u662f\u8fde\u63a5\u5230PostgreSQL\u7684\u4fe1\u606f\u3002\u6b64\u6b21\u662f\u4e00\u4e2a\u793a\u4f8b\uff0c\u4f46\u6839\u636e\u73af\u5883\u4e0d\u540c\uff0c\u5c06\u63d0\u4f9b\u4e0a\u8ff0\u4fe1\u606f\u3002<br \/>\n\u8bf7\u53c2\u8003\u6700\u521d\u7684\u793a\u4f8b\u4ee3\u7801\u4ee5\u83b7\u53d6\u5177\u4f53\u793a\u4f8b\u3002<\/p>\n<h2>\u6267\u884cSQL\u6587<\/h2>\n<p>\u5728Java\u4e2d\u6267\u884cSQL\u8bed\u53e5\u65f6\uff0c\u6709\u4e24\u79cd\u65b9\u6cd5\uff0c\u5206\u522b\u662f&#8221;Statement&#8221;\u548c&#8221;PreparedStatement&#8221;\u3002<br \/>\n&#8220;Statement&#8221;\u662f\u76f4\u63a5\u6267\u884c\u8f93\u5165\u7684\u5b57\u7b26\u4e32\uff0c\u975e\u5e38\u7b80\u5355\u3002<br \/>\n&#8220;PreparedStatement&#8221;\u662f\u9884\u7f16\u8bd1\u5e76\u4f18\u5316\u8fc7\u7684\uff0c\u8fd8\u53ef\u4ee5\u540e\u7eed\u66f4\u6539\u53c2\u6570\uff0c\u975e\u5e38\u4f18\u79c0\u3002<br \/>\n\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u5982\u679c\u4f7f\u7528\u76f8\u540c\u7684SQL\u8bed\u53e5\uff0c\u6211\u4eec\u57fa\u672c\u4e0a\u4f1a\u4f7f\u7528&#8221;PreparedStatement&#8221;\u3002<br \/>\n\u4e0d\u8fc7\u8fd9\u6b21\u6211\u4eec\u5c06\u4f7f\u7528\u7b80\u5355\u7684&#8221;Statement&#8221;\u3002<\/p>\n<h3>\u67e5\u8be2\u8bed\u53e5<\/h3>\n<pre class=\"post-pre\"><code><span class=\"nc\">Statement<\/span> <span class=\"n\">stmt<\/span> <span class=\"o\">=<\/span> <span class=\"n\">conn<\/span><span class=\"o\">.<\/span><span class=\"na\">createStatement<\/span><span class=\"o\">();<\/span>\r\n\r\n<span class=\"nc\">String<\/span> <span class=\"n\">sql<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"SELECT 1\"<\/span><span class=\"o\">;<\/span>\r\n<span class=\"n\">rset<\/span> <span class=\"o\">=<\/span> <span class=\"n\">stmt<\/span><span class=\"o\">.<\/span><span class=\"na\">executeQuery<\/span><span class=\"o\">(<\/span><span class=\"n\">sql<\/span><span class=\"o\">);<\/span>\r\n\r\n<span class=\"c1\">\/\/SELECT\u7d50\u679c\u306e\u53d7\u3051\u53d6\u308a<\/span>\r\n<span class=\"k\">while<\/span><span class=\"o\">(<\/span><span class=\"n\">rset<\/span><span class=\"o\">.<\/span><span class=\"na\">next<\/span><span class=\"o\">()){<\/span>\r\n    <span class=\"nc\">String<\/span> <span class=\"n\">col<\/span> <span class=\"o\">=<\/span> <span class=\"n\">rset<\/span><span class=\"o\">.<\/span><span class=\"na\">getString<\/span><span class=\"o\">(<\/span><span class=\"mi\">1<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"n\">col<\/span><span class=\"o\">);<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>\u4e3a\u4e86\u6267\u884cSQL\u8bed\u53e5\uff0c\u6211\u4eec\u901a\u8fc7&#8221;createStatement&#8221;\u65b9\u6cd5\u521d\u59cb\u5316&#8221;Statement&#8221;\u3002\u5c3d\u7ba1\u5b83\u4eec\u770b\u8d77\u6765\u76f8\u4f3c\uff0c\u4f46\u901a\u8fc7\u4f20\u9012\u7ed9&#8221;createStatement&#8221;\u65b9\u6cd5\u7684\u53c2\u6570\u53ef\u4ee5\u6539\u53d8SELECT\u7ed3\u679c\u7684\u63a5\u6536\u65b9\u5f0f\u3002\u5728\u4e0b\u9762\u7ed9\u51fa\u4e86\u7b80\u5355\u7684\u8bf4\u660e\uff0c\u4f46\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u60a8\u65e0\u9700\u6307\u5b9a\u53c2\u6570\uff0c\u53ea\u9700\u4f7f\u7528\u9ed8\u8ba4\u503c\u5373\u53ef\u3002<\/p>\n<div>\n<div class=\"post-table\">\u7b2c1\u5f15\u6570\u8aac\u660eResultSet.TYPE_FORWARD_ONLY\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u3002<br \/>\n\u30ab\u30fc\u30bd\u30eb\u306f\u9806\u65b9\u5411\u306b\u306e\u307f\u79fb\u52d5\u53ef\u80fd\u3002<br \/>\nResultSet\u306elast()\u3001first()\u7b49\u306f\u4f7f\u7528\u3067\u304d\u306a\u3044\u3002ResultSet.TYPE_FORWARD_ONLY\u30ab\u30fc\u30bd\u30eb\u306f\u9806\u65b9\u5411\u30fb\u9006\u65b9\u5411\u306b\u79fb\u52d5\u53ef\u80fd\u3002<br \/>\n\u30c7\u30fc\u30bf\u53d6\u5f97\u5f8c\u306b\u3001\u4ed6\u306e\u63a5\u7d9a\u306b\u3088\u3063\u3066\u5909\u66f4\u3055\u308c\u305f\u30c7\u30fc\u30bf\u3092\u53cd\u6620\u3057\u306a\u3044\u3002ResultSet.TYPE_SCROLL_INSENSITIVE\u30ab\u30fc\u30bd\u30eb\u306f\u9806\u65b9\u5411\u30fb\u9006\u65b9\u5411\u306b\u79fb\u52d5\u53ef\u80fd\u3002<br \/>\n\u30c7\u30fc\u30bf\u53d6\u5f97\u5f8c\u306b\u3001\u4ed6\u306e\u63a5\u7d9a\u306b\u3088\u3063\u3066\u5909\u66f4\u3055\u308c\u305f\u30c7\u30fc\u30bf\u3092\u53cd\u6620\u3059\u308b\u3002<br \/>\n\u8aad\u307f\u53d6\u308a\u4e00\u8cab\u6027\u304c\u4fdd\u8a3c\u3055\u308c\u306a\u304f\u306a\u308b\u305f\u3081\u975e\u63a8\u5968\u3002<\/div>\n<\/div>\n<div>\n<div class=\"post-table\">\u7b2c1\u5f15\u6570\u8aac\u660eResultSet.CONCUR_READ_ONLY\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u3002<br \/>\nResultSet\u306b\u3088\u308b\u66f4\u65b0\u4e0d\u53ef\u3002ResultSet.CONCUR_UPDATABLEResultSet\u306b\u3088\u308b\u66f4\u65b0\u53ef\u80fd\u3002<br \/>\nupdateXXX()\u7b49\u304c\u4f7f\u7528\u3067\u304d\u308b\u3002<\/div>\n<\/div>\n<p>\u5728 SELECT \u8bed\u53e5\u4e2d\uff0c\u4f7f\u7528 &#8220;ResultSet&#8221; \u7c7b\u6765\u63a5\u6536\u7ed3\u679c\u3002<br \/>\n\u57fa\u672c\u4e0a\uff0c\u53ef\u4ee5\u4f7f\u7528 next() \u65b9\u6cd5\u6309\u987a\u5e8f\u63d0\u53d6\u83b7\u53d6\u5230\u7684\u6570\u636e\u3002<br \/>\n\u5728\u6700\u540e\u4e00\u884c\u6570\u636e\u4e4b\u540e\u518d\u6267\u884c next() \u65b9\u6cd5\uff0c\u7ed3\u679c\u5c06\u53d8\u4e3a null\uff0c\u56e0\u6b64\u53ef\u4ee5\u4f7f\u7528 while \u5faa\u73af\u6765\u83b7\u53d6\u5168\u90e8\u6570\u636e\u3002<br \/>\n\u5f53\u4ece ResultSet \u4e2d\u63d0\u53d6\u6570\u636e\u65f6\uff0c\u9700\u8981\u6307\u5b9a\u5217\u3002<br \/>\n\u6307\u5b9a\u5217\u7684\u65b9\u6cd5\u53ef\u4ee5\u662f\u5217\u7684\u7d22\u5f15\uff08\u4ece\u7b2c 0 \u5217\u5f00\u59cb\uff09\uff0c\u6216\u8005\u662f\u5217\u7684\u540d\u79f0\u3002<\/p>\n<p>\u5982\u679c\u53ea\u60f3\u83b7\u53d6\u6700\u540e\u4e00\u6761\u6216\u7b2c\u4e00\u6761\u6570\u636e\uff0c\u53ef\u4ee5\u4f7f\u7528last()\u548cfirst()\u65b9\u6cd5\u3002\u4f46\u662f\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u8fd9\u4e24\u4e2a\u65b9\u6cd5\u9700\u8981\u5728&#8221;createStatement&#8221;\u65b9\u6cd5\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\u4e2d\u4f20\u9012ResultSet.TYPE_FORWARD_ONLY\u3002<\/p>\n<h3>DML\uff08\u63d2\u5165\u3001\u5220\u9664\u3001\u66f4\u65b0\uff09\u64cd\u4f5c\u8bed\u53e5<\/h3>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/INSERT\u6587\u306e\u5b9f\u884c<\/span>\r\n<span class=\"n\">sql<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"INSERT INTO jdbc_test VALUES (1, 'AAA')\"<\/span><span class=\"o\">;<\/span>\r\n<span class=\"n\">stmt<\/span><span class=\"o\">.<\/span><span class=\"na\">executeUpdate<\/span><span class=\"o\">(<\/span><span class=\"n\">sql<\/span><span class=\"o\">);<\/span>\r\n<span class=\"n\">conn<\/span><span class=\"o\">.<\/span><span class=\"na\">commit<\/span><span class=\"o\">();<\/span>\r\n<\/code><\/pre>\n<p>DML\u4e0eSELECT\u4e0d\u540c\uff0c\u4e0d\u63a5\u6536\u7ed3\u679c\uff0c\u6240\u4ee5\u4e0d\u4f7f\u7528ResultSet\u3002<br \/>\n\u56e0\u6b64\uff0c\u5728\u4f7f\u7528\u300ccreateStatement\u300d\u65b9\u6cd5\u65f6\u4e0d\u9700\u8981\u6307\u5b9a\u53c2\u6570\u3002<br \/>\n\u4f46\u662f\uff0c\u5fc5\u987b\u4f7f\u7528\u300cexecuteUpdate()\u300d\u65b9\u6cd5\u6765\u6267\u884cSQL\u8bed\u53e5\u3002<br \/>\n\u53e6\u5916\uff0c\u81ea\u52a8\u63d0\u4ea4\u662f\u5173\u95ed\u7684\u60c5\u51b5\u4e0b\uff0c\u9700\u8981\u4f7f\u7528commit()\u65b9\u6cd5\u8fdb\u884c\u63d0\u4ea4\uff0c\u540e\u9762\u4f1a\u8be6\u7ec6\u8bf4\u660e\u3002<\/p>\n<h3>\u521b\u5efa\u8bed\u53e5\uff08CREATE &#8230;\uff09<\/h3>\n<p>\u8fd9\u6b21\u7684\u793a\u4f8b\u4e2d\u6ca1\u6709\u5305\u542b\uff0c\u4f46\u662f\u53ef\u4ee5\u4f7f\u7528\u4e0e DML \u8bed\u53e5\u76f8\u540c\u7684\u65b9\u6cd5\u6267\u884c\u3002<br \/>\n\u5bf9\u4e8e PostgreSQL \u6765\u8bf4\uff0cDDL \u8bed\u53e5\u4e0d\u4f1a\u81ea\u52a8\u63d0\u4ea4\uff0c\u6240\u4ee5\u5728\u81ea\u52a8\u63d0\u4ea4\u5173\u95ed\u7684\u60c5\u51b5\u4e0b\uff0c\u9700\u8981\u50cf DML \u8bed\u53e5\u4e00\u6837\u663e\u5f0f\u5730\u63d0\u4ea4\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/CREATE\u6587\u306e\u5b9f\u884c<\/span>\r\n<span class=\"n\">sql<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"CREATE TABLE hoge (col1 integer)\"<\/span><span class=\"o\">;<\/span>\r\n<span class=\"n\">stmt<\/span><span class=\"o\">.<\/span><span class=\"na\">executeUpdate<\/span><span class=\"o\">(<\/span><span class=\"n\">sql<\/span><span class=\"o\">);<\/span>\r\n<span class=\"n\">conn<\/span><span class=\"o\">.<\/span><span class=\"na\">commit<\/span><span class=\"o\">();<\/span>\r\n<\/code><\/pre>\n<h3>\u63d0\u4ea4\uff0c\u56de\u6eda<\/h3>\n<p>\u6b63\u5982\u524d\u9762\u63d0\u5230\u7684\uff0c\u53ef\u4ee5\u901a\u8fc7\u51fd\u6570\u6267\u884cCOMMIT\u548cROLLBACK\u64cd\u4f5c\u3002<br \/>\n\u56e0\u6b64\uff0c\u4e0d\u518d\u9700\u8981\u7f16\u5199SQL\u8bed\u53e5\u4e86\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/COMMIT\u306e\u5b9f\u884c<\/span>\r\n<span class=\"n\">conn<\/span><span class=\"o\">.<\/span><span class=\"na\">commit<\/span><span class=\"o\">();<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/ROLLBACK\u306e\u5b9f\u884c<\/span>\r\n<span class=\"n\">conn<\/span><span class=\"o\">.<\/span><span class=\"na\">rollback<\/span><span class=\"o\">();<\/span>\r\n<\/code><\/pre>\n<h2>\u4ea4\u6613<\/h2>\n<h3>\u81ea\u52a8\u63d0\u4ea4<\/h3>\n<p>\u5728\u4f7f\u7528JDBC\u65f6\uff0c\u9ed8\u8ba4\u60c5\u51b5\u4e0b\u4f1a\u542f\u7528\u81ea\u52a8\u63d0\u4ea4\u529f\u80fd\u3002\u5bf9\u4e8e\u4f7f\u7528PostgreSQL\u7684\u4eba\u6765\u8bf4\uff0c\u8fd9\u6ca1\u6709\u95ee\u9898\uff0c\u4f46\u5bf9\u4e8e\u5176\u4ed6\u5173\u7cfb\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\u6765\u8bf4\uff0c\u5219\u9700\u8981\u6ce8\u610f\u3002\u8bf7\u6ce8\u610f\uff0c\u7531\u4e8ePostgreSQL\u4e5f\u9ed8\u8ba4\u542f\u7528\u81ea\u52a8\u63d0\u4ea4\u529f\u80fd\u3002<\/p>\n<p>\u81ea\u52a8\u63d0\u4ea4\u7684\u542f\u7528\/\u7981\u7528\u662f\u901a\u8fc7setAutoCommit()\u65b9\u6cd5\u6765\u5b9e\u73b0\u7684\u3002<br \/>\n\u5f53\u4e3atrue\u65f6\u4e3a\u542f\u7528(\u9ed8\u8ba4)\uff0c\u5f53\u4e3afalse\u65f6\u4e3a\u7981\u7528\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/\u81ea\u52d5\u30b3\u30df\u30c3\u30c8OFF<\/span>\r\n<span class=\"n\">conn<\/span><span class=\"o\">.<\/span><span class=\"na\">setAutoCommit<\/span><span class=\"o\">(<\/span><span class=\"kc\">false<\/span><span class=\"o\">);<\/span>\r\n<\/code><\/pre>\n<p>\u5982\u679c\u60f3\u5728Java\u4e2d\u8fdb\u884c\u4e8b\u52a1\u5904\u7406\uff0c\u901a\u5e38\u8981\u7981\u7528\u81ea\u52a8\u63d0\u4ea4\u3002\u7531\u4e8e\u540e\u7eed\u7684\u539f\u56e0\uff0c\u5f88\u5c11\u9700\u8981\u8f93\u5165SQL\u8bed\u53e5\u7684BEGIN\u3002<\/p>\n<h3>\u5f53\u81ea\u52a8\u63d0\u4ea4\u88ab\u5173\u95ed\u65f6\u7684\u4e8b\u52a1\u5904\u7406<\/h3>\n<p>\u5982\u679c\u81ea\u52a8\u63d0\u4ea4\u88ab\u5173\u95ed\u7684\u60c5\u51b5\u4e0b\uff0cJDBC\u4f1a\u5728SQL\u5f00\u59cb\u65f6\u81ea\u52a8\u8f93\u5165BEGIN\u3002\u56e0\u6b64\uff0c\u5982\u679c\u660e\u786e\u5730\u5199\u51faBEGIN\uff0c\u5219\u6570\u636e\u5e93\u4e2d\u4f1a\u6267\u884c\u4e24\u6b21BEGIN\u3002\u7531\u4e8eCOMMIT\u548cROLLBACK\u4e5f\u662f\u901a\u8fc7\u51fd\u6570\u63d0\u4f9b\u7684\uff0c\u56e0\u6b64\u5728\u4f7f\u7528Java\u8fdb\u884c\u4e8b\u52a1\u5904\u7406\u65f6\uff0c\u5f88\u5c11\u4f1a\u6709\u673a\u4f1a\u8f93\u5165\u4e0e\u4e8b\u52a1\u76f8\u5173\u7684SQL\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/BEGIN\u6587\u306e\u5b9f\u884c<\/span>\r\n<span class=\"n\">stmt<\/span> <span class=\"o\">=<\/span> <span class=\"n\">conn<\/span><span class=\"o\">.<\/span><span class=\"na\">createStatement<\/span><span class=\"o\">();<\/span>\r\n<span class=\"nc\">String<\/span> <span class=\"n\">sql<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"BEGIN\"<\/span><span class=\"o\">;<\/span>\r\n<span class=\"n\">rset<\/span> <span class=\"o\">=<\/span> <span class=\"n\">stmt<\/span><span class=\"o\">.<\/span><span class=\"na\">executeQuery<\/span><span class=\"o\">(<\/span><span class=\"n\">sql<\/span><span class=\"o\">);<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"n\">LOG<\/span><span class=\"p\">:<\/span>  <span class=\"k\">execute<\/span> <span class=\"o\">&lt;<\/span><span class=\"k\">unnamed<\/span><span class=\"o\">&gt;<\/span><span class=\"p\">:<\/span> <span class=\"k\">BEGIN<\/span>\r\n<span class=\"n\">LOG<\/span><span class=\"p\">:<\/span>  <span class=\"k\">execute<\/span> <span class=\"o\">&lt;<\/span><span class=\"k\">unnamed<\/span><span class=\"o\">&gt;<\/span><span class=\"p\">:<\/span> <span class=\"k\">BEGIN<\/span>\r\n<span class=\"n\">WARNING<\/span><span class=\"p\">:<\/span>  <span class=\"n\">there<\/span> <span class=\"k\">is<\/span> <span class=\"n\">already<\/span> <span class=\"n\">a<\/span> <span class=\"n\">transaction<\/span> <span class=\"k\">in<\/span> <span class=\"n\">progress<\/span>\r\n<\/code><\/pre>\n<p>\u6211\u5df2\u5c06PostgreSQL\u53c2\u6570log_statement\u8bbe\u7f6e\u4e3a&#8217;all&#8217;\u3002<\/p>\n<h1>\u9644\u6ce8\uff1a\u6709\u5173\u52a0\u8f7dJDBC\u9a71\u52a8\u7a0b\u5e8f\u7684\u8865\u5145\u4fe1\u606f\u3002<\/h1>\n<p>\u5982\u679c\u662fJDBC 4.0\u4e4b\u524d\u7684\u7248\u672c\uff0c\u9700\u8981\u901a\u8fc7Class.forName\u6765\u660e\u786e\u52a0\u8f7dJDBC\u9a71\u52a8\u7a0b\u5e8f\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">try<\/span><span class=\"o\">{<\/span>\r\n    <span class=\"nc\">Class<\/span><span class=\"o\">.<\/span><span class=\"na\">forName<\/span><span class=\"o\">(<\/span><span class=\"s\">\"org.postgresql.Driver\"<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"err\">\u2026<\/span>\r\n<span class=\"o\">}<\/span>\r\n<span class=\"k\">catch<\/span> <span class=\"o\">(<\/span><span class=\"nc\">ClassNotFoundException<\/span> <span class=\"n\">e<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"err\">\u2026<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>\u5bf9\u4e8e\u4e0d\u540c\u79cd\u7c7b\u7684JDBC\u9a71\u52a8\u7a0b\u5e8f\uff0c\u4e0a\u8ff0\u5b57\u7b26\u4e32\u7684\u63cf\u8ff0\u662f\u4e0d\u540c\u7684\u3002<br \/>\n\u5982\u679c\u8981\u58f0\u660e\u5b83\uff0c\u5c31\u9700\u8981\u8fdb\u884cClassNotFoundException\u7684\u5f02\u5e38\u5904\u7406\u3002<\/p>\n<p>\u7136\u800c\uff0c\u81ea\u4eceJDBC 4.0\uff08=Java 1.6\uff09\u4ee5\u540e\uff0c\u5b83\u4f1a\u81ea\u52a8\u52a0\u8f7d\uff0c\u56e0\u6b64\u4e0d\u518d\u9700\u8981\u4e0a\u8ff0\u7684\u624b\u52a8\u52a0\u8f7d\u3002<\/p>\n<blockquote><p>\u5728\u4ee5\u524d\u7248\u672c\u7684JDBC\u4e2d\uff0c\u8981\u83b7\u53d6\u4e00\u4e2a\u8fde\u63a5\uff0c\u60a8\u9996\u5148\u9700\u8981\u901a\u8fc7\u8c03\u7528\u65b9\u6cd5Class.forName\u6765\u521d\u59cb\u5316JDBC\u9a71\u52a8\u7a0b\u5e8f\u3002\u8fd9\u4e2a\u65b9\u6cd5\u9700\u8981\u4e00\u4e2ajava.sql.Driver\u7c7b\u578b\u7684\u5bf9\u8c61\u3002\u6bcf\u4e2aJDBC\u9a71\u52a8\u7a0b\u5e8f\u5305\u542b\u4e00\u4e2a\u6216\u591a\u4e2a\u5b9e\u73b0java.sql.Driver\u63a5\u53e3\u7684\u7c7b\u3002Java DB\u7684\u9a71\u52a8\u7a0b\u5e8f\u662forg.apache.derby.jdbc.EmbeddedDriver\u548corg.apache.derby.jdbc.ClientDriver\uff0c\u800cMySQL Connector\/J\u7684\u9a71\u52a8\u7a0b\u5e8f\u662fcom.mysql.jdbc.Driver\u3002\u8bf7\u67e5\u9605\u60a8\u7684DBMS\u9a71\u52a8\u7a0b\u5e8f\u7684\u6587\u6863\u4ee5\u83b7\u53d6\u5b9e\u73b0java.sql.Driver\u63a5\u53e3\u7684\u7c7b\u7684\u540d\u79f0\u3002<\/p>\n<p>\u4efb\u4f55\u5728\u60a8\u7684\u7c7b\u8def\u5f84\u4e2d\u627e\u5230\u7684JDBC 4.0\u9a71\u52a8\u7a0b\u5e8f\u90fd\u4f1a\u88ab\u81ea\u52a8\u52a0\u8f7d\u3002\uff08\u4f46\u662f\uff0c\u5728JDBC 4.0\u4e4b\u524d\u60a8\u5fc5\u987b\u624b\u52a8\u52a0\u8f7d\u4efb\u4f55\u9a71\u52a8\u7a0b\u5e8f\uff0c\u53ef\u4ee5\u4f7f\u7528\u65b9\u6cd5Class.forName\uff09\u3002<\/p><\/blockquote>\n<hr \/>\n<blockquote><p>\u5728\u65e9\u671f\u7684JDBC\u7248\u672c\u4e2d\uff0c\u8981\u83b7\u53d6\u8fde\u63a5\uff0c\u9996\u5148\u9700\u8981\u8c03\u7528Class.forName\u65b9\u6cd5\u6765\u521d\u59cb\u5316JDBC\u9a71\u52a8\u7a0b\u5e8f\u3002\u8fd9\u4e2a\u65b9\u6cd5\u9700\u8981\u4e00\u4e2ajava.sql.Driver\u7c7b\u578b\u7684\u5bf9\u8c61\u3002\u6bcf\u4e2aJDBC\u9a71\u52a8\u7a0b\u5e8f\u90fd\u5305\u542b\u4e00\u4e2a\u6216\u591a\u4e2a\u5b9e\u73b0java.sql.Driver\u63a5\u53e3\u7684\u7c7b\u3002\u5bf9\u4e8eJava DB\uff0c\u9a71\u52a8\u7a0b\u5e8f\u662forg.apache.derby.jdbc.EmbeddedDriver\u548corg.apache.derby.jdbc.ClientDriver\uff1b\u5bf9\u4e8eMySQL Connector \/ J\uff0c\u9a71\u52a8\u7a0b\u5e8f\u662fcom.mysql.jdbc.Driver\u3002\u8981\u83b7\u53d6\u5b9e\u73b0java.sql.Driver\u63a5\u53e3\u7684\u7c7b\u7684\u540d\u79f0\uff0c\u8bf7\u53c2\u8003DBMS\u9a71\u52a8\u7a0b\u5e8f\u7684\u624b\u518c\u3002<\/p>\n<p>\u5728\u7c7b\u8def\u5f84\u4e2d\u7684JDBC 4.0\u9a71\u52a8\u7a0b\u5e8f\u5c06\u81ea\u52a8\u52a0\u8f7d\u3002\uff08\u7136\u800c\uff0c\u60a8\u4ecd\u9700\u8981\u4f7f\u7528Class.forName\u65b9\u6cd5\u624b\u52a8\u52a0\u8f7dJDBC 4.0\u4e4b\u524d\u7684\u9a71\u52a8\u7a0b\u5e8f\u3002\uff09<\/p><\/blockquote>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">JDBC Basics Tutorial \uff5eEstablishing a Connection\uff5e\u3088\u308a\u5f15\u7528<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">https:\/\/docs.oracle.com\/javase\/tutorial\/jdbc\/basics\/connecting.html#drivermanager<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u53c2\u8003\uff1aThe PostgreSQL JDBC Interface \uff5eChapter 3. Initializing the Driver\uff5e<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">https:\/\/jdbc.postgresql.org\/documentation\/head\/load.html<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u9996\u5148 \u7531\u4e8e\u6700\u8fd1\u63a5\u89e6\u5404\u79cd\u7a0b\u5e8f\u8fde\u63a5\u5230PostgreSQL\u7684\u673a\u4f1a\u589e\u591a\uff0c\u6240\u4ee5\u6211\u6574\u7406\u4e86\u4e00\u4e0b\u6b65\u9aa4\u3002 \u7531\u4e8e\u7bc7\u5e45\u8f83\u957f\uff0c\u672c\u6b21\u5c06\u5c1d [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-31647","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u4f7f\u7528Java\u8fde\u63a5\u5230PostgreSQL\u6570\u636e\u5e93 - 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