获取错误ORA-06502:PL/SQL:数字或值错误

Question

我得到

ORA-06502:PL/SQL:以下代码中的数字或值错误：

record_state := record_state || 'Inserting record Entry for student: ' || 
roll_no || ' for date: ' || To_Char(admission_date,'yyyymmdd') ||
' @ ' || TO_CHAR(SYSDATE, 'YYYY-MM-DD HH24:MI:SS') || CHR(10);

以下是数据类型：

roll_no        - NUMBER(10,0)
admission_date - TIMESTAMP(6)
record_state   - CLOB

Answer 1

您需要使用to_clob将字符串转换为clob，然后可以按如下方式连接两个clob：

record_state := record_state || 
to_clob(
'Inserting record Entry for student: ' || roll_no || ' for date: ' || To_Char(admission_date,'yyyymmdd') || ' @ ' || TO_CHAR(SYSDATE, 'YYYY-MM-DD HH24:MI:SS') || CHR(10)
);

干杯！！

Answer 2

如果您有lob对象，我建议使用DBMS_LOB库。

DECLARE
record_state  CLOB;  
BEGIN
DBMS_LOB.CREATETEMPORARY(record_state);  
-- here you should make sure that the string is not too long (max 32K), otherwise the concatenation with pipes will not work. There will be an exception.
DBMS_LOB.append (record_state , 'Inserting record Entry for student: ' || roll_no || ' for date: ' || To_Char(admission_date,'yyyymmdd') || ' @ ' || TO_CHAR(SYSDATE, 'YYYY-MM-DD HH24:MI:SS') || CHR(10)); 
-- do more operations
dbms_lob.freetemporary(record_state);
END ;
/