How to convert clob to string in oracle

In Oracle, you can use the "dbms_lob.substr()" method to convert clob data into a string. This method is used to convert the corresponding field into a string. The syntax is "select dbms_lob.substr(clob) from table;"; but when the length of the specified field in this method exceeds a certain value, an error will be reported.

The operating environment of this tutorial: Windows 10 system, Oracle version 12c, Dell G3 computer.

How to convert clob to string in oracle

Use the dbms_lob.substr() method to convert the corresponding field into a string as follows:

select dbms_lob.substr(content) from table;

This method has a disadvantage. When the length of the content field exceeds a certain value, an error will be reported.

Extended knowledge:

Summary: Oracle's wm_concat syntax is used in the sql statement, which shows that the query field returned through the java call is of clob type, which requires Convert clob type to string. Divided into two methods. The above is the first method, and the following is the second method, which is to convert the clob type to the String type in the java code. This method has no length limit:

The next focus is to convert the object of this field obtained from the database into a Clob object, as follows:

String content = ClobToString((Clob)obj[1]);

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