Replace a string single quote(') with underscore(_)

Question

I have more than 100 tables in a schema.
I have to find out if a string has a single quote in the column and replace it with an underscore.
I have 2 columns CREATE_USER and UPDATE_USER in all the tables. Now i want to update the values if the string has a single quote in it.
I tried it with execute immediate but it is not allowing underscore in the statement.
DECLARE
   v_table_name    VARCHAR2 (30);
   v_column_name   VARCHAR2 (30);
   CURSOR c_name
   IS
      SELECT DISTINCT table_name, column_name
                 FROM user_tab_cols
                WHERE column_name IN ('LOGIN', 'CREATE_USER', 'UPDATE_USER')
                  AND table_name NOT LIKE '%JN';
BEGIN
   FOR rec IN c_name
   LOOP
      v_table_name     := rec.table_name;
      v_column_name    := rec.column_name;
      EXECUTE IMMEDIATE    'update '
                        || v_table_name
                        || ' set '
                        || v_column_name
                        || ' = REPLACE('
                        || v_column_name
                        || ','''',"_") where '
                        || v_column_name
                        || ' like "%''%"';
   END LOOP;
END;
/i am getting the below error:
ORA-00904: "%'%": invalid identifier
ORA-06512: at line 17Can anyone let me know what is the error in the statement and how to overcome it

Answer 1

please try to replace your execute immediate with:
EXECUTE IMMEDIATE  'update '
                        || v_table_name
                        || ' set '
                        || v_column_name
                        || ' = REPLACE('
                        || v_column_name
                        || ','''''''',''_'') where '
                        || v_column_name
                        || ' like ''%''''%''';You can check the statement when you take a look at the construction before like this:
declare
  v_sql varchar2(1000);
begin
   v_sql:= 'update '
                        || v_table_name
                        || ' set '
                        || v_column_name
                        || ' = REPLACE('
                        || v_column_name
                        || ','''''''',''_'') where '
                        || v_column_name
                        || ' like ''%''''%''';
   dbms_output.put_line(v_sql);
   execute immediate v_sql;
   ...Edited by: hm on 23.11.2010 01:43