当字符超过 32K 时，Oracle XMLAGG 不起作用

Question

为存储过程中声明的 clob 变量赋值时出现以下错误。当我运行查询 SQL Developer.

时同样有效

这是我目前在我的存储过程中使用的查询：

SELECT 
    RTRIM(XMLAGG(XMLELEMENT(E, col1, chr(10)).EXTRACT('//text()')).GetClobVal(),',') 
        INTO CLOB_VAR 
FROM Table1**

我不明白为什么它会导致诸如数字或值错误之类的错误。

错误报告-

ORA-06502: PL/SQL: numeric or value error
ORA-06512: at "XXXXXX.TMP_STORED_PROC", line 39
ORA-06512: at line 1
06502. 00000 - "PL/SQL: numeric or value error%s"
*Cause: An arithmetic, numeric, string, conversion, or constraint error occurred. For example, this error occurs if an attempt is made to assign the value NULL to a variable declared NOT NULL, or if an attempt is made to assign an integer larger than 99 to a variable declared NUMBER(2).
*Action: Change the data, how it is manipulated, or how it is declared so that values do not violate constraints.

存储过程：

create or replace PROCEDURE TMP_STORE_PROC  () IS
    CLOB_TEXT CLOB;
    start_timestamp TIMESTAMP WITH TIME ZONE := SYSTIMESTAMP;
    ERR_CODE VARCHAR2(20);
    ERR_MSG VARCHAR2(500);
    BEGIN
        SAVEPOINT startTransaction;

        SELECT RTRIM(XMLAGG(XMLELEMENT(E, col1, chr(10)).EXTRACT('//text()')).GetClobVal(),',') INTO CLOB_TEXT FROM Table1

        DBMS_OUTPUT.PUT_LINE('################ String length -- '||TO_CHAR(CLOB_TEXT));

        COMMIT;
      NULL;
     EXCEPTION 
        WHEN OTHERS THEN
            ERR_CODE := SQLCODE;
            ERR_MSG := SQLERRM;
            DBMS_OUTPUT.PUT_LINE('Stored procedure failed in execution. Error Message : '||ERR_CODE||' -- MSG --  '||ERR_MSG);
            ROLLBACK TO startTransaction;
            RAISE;
    END;

Answer 1

替换

DBMS_OUTPUT.PUT_LINE('################ String length -- '||TO_CHAR(CLOB_TEXT));

与以下

DBMS_OUTPUT.put_line ( '################ String length -- ' || length(clob_text));

程序

CREATE OR REPLACE PROCEDURE tmp_store_proc
IS
   clob_text         CLOB;
   start_timestamp   TIMESTAMP WITH TIME ZONE := SYSTIMESTAMP;
   err_code          VARCHAR2 (20);
   err_msg           VARCHAR2 (500);
BEGIN
   SAVEPOINT starttransaction;

   SELECT RTRIM (
             XMLAGG (XMLELEMENT (e, col1, CHR (10)).EXTRACT ('//text()')).getclobval (),
             ',')
     INTO clob_text
     FROM table1;


   DBMS_OUTPUT.put_line (
      '################ String length -- ' || LENGTH (clob_text));

   COMMIT;
   NULL;
EXCEPTION
   WHEN OTHERS
   THEN
      err_code := SQLCODE;
      err_msg := SQLERRM;
      DBMS_OUTPUT.put_line (
            'Stored procedure failed in execution. Error Message : '
         || err_code
         || ' -- MSG --  '
         || err_msg);
      ROLLBACK TO starttransaction;
      RAISE;
END;

通过

执行程序

exec tmp_store_proc

输出

########## String length -- 18224744

如果您想打印 CLOB，请查看 this

当字符超过 32K 时，Oracle XMLAGG 不起作用

Oracle XMLAGG doesn't work when characters are more than 32K

plsql

stored-procedures

clob

oracle11g