How to convert Clob type to string in Oracle?

2 years ago
Sophia Anderson
1 minute

In Oracle, you can use the DBMS_LOB.SUBSTR function to convert a CLOB type to a string.

Here is an example code:

DECLARE
  v_clob CLOB;
  v_string VARCHAR2(4000);
BEGIN
  -- 假设v_clob是一个CLOB类型的变量
  
  -- 将CLOB类型转换为字符串
  v_string := DBMS_LOB.SUBSTR(v_clob, 4000, 1);
  
  -- 输出字符串
  DBMS_OUTPUT.PUT_LINE(v_string);
END;

In the example above, the DBMS_LOB.SUBSTR function takes three parameters: a CLOB type variable, the length to truncate, and the starting position. The function will return a VARCHAR2 type string that represents the content of the CLOB at the specified length and starting position.

Please note that the maximum return length of the DBMS_LOB.SUBSTR function is 4000 characters. If the CLOB content exceeds this length, you can obtain the complete string by calling the function multiple times and concatenating the results.

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