Oracle 在所有表的所有列中搜索字符串

Question

这个问题已经有答案了:

Search All Fields In All Tables For A Specific Value (Oracle) (17 个回答)

已关闭 9 年前。

我需要在 Oracle 数据库中搜索所有表和列中的字符串。我在网上找到了以下查询，但是当我执行它时，出现以下错误

感谢任何帮助

ORA-06550: line 6, column 31:
PL/SQL: ORA-00904: "COLUMN_NAME": invalid identifier
ORA-06550: line 6, column 12:
PL/SQL: SQL Statement ignored
ORA-06550: line 8, column 30:
PLS-00364: loop index variable 'T' use is invalid
ORA-06550: line 7, column 4:
PL/SQL: Statement ignored
ORA-06550: line 12, column 38:
PLS-00364: loop index variable 'T' use is invalid
ORA-06550: line 12, column 16:
PL/SQL: Statement ignored

BEGIN  
  FOR t IN (SELECT table_name, column_name FROM all_tables) LOOP   
   EXECUTE IMMEDIATE    
    'SELECT COUNT(*) FROM '||t.table_name||' WHERE '||t.column_name||' = :1'   
     INTO match_count  
       USING v_search_string; 
          IF match_count > 0 THEN 
               dbms_output.put_line( t.table_name ||' '||t.column_name||' '||match_count );
           END IF; 
  END LOOP;
END;
/

Answer 1

至少，您需要查询 ALL_TAB_COLUMNS，而不是 ALL_TABLES

DECLARE
  match_count integer;
  v_search_string varchar2(4000) := <<string you want to search for>>;
BEGIN  
  FOR t IN (SELECT owner, table_name, column_name FROM all_tab_columns) LOOP   
    EXECUTE IMMEDIATE    
      'SELECT COUNT(*) FROM '||t.owner || '.' || t.table_name||
      ' WHERE '||t.column_name||' = :1'   
       INTO match_count  
      USING v_search_string; 
    IF match_count > 0 THEN 
      dbms_output.put_line( t.owner || '.' || t.table_name ||' '||t.column_name||' '||match_count );
    END IF; 
  END LOOP;
END;
/

但是，如果您正在查找字符串，那么您几乎肯定会希望将自己限制为查找可以存储字符串的列。例如，在 DATE 列中搜索字符串是没有意义的。除非您对 BLOB 列包含的内容有大量先验知识，并且能够解析 BLOB 列的二进制格式，否则在 BLOB 列中搜索字符串是没有意义的。鉴于此，我怀疑您想要更像的东西

DECLARE
  match_count integer;
  v_search_string varchar2(4000) := <<string you want to search for>>;
BEGIN  
  FOR t IN (SELECT owner,
                   table_name, 
                   column_name 
              FROM all_tab_columns
             WHERE data_type in ('CHAR', 'VARCHAR2', 'NCHAR', 'NVARCHAR2', 
                                 'CLOB', 'NCLOB') ) 
  LOOP   
    BEGIN
      EXECUTE IMMEDIATE    
        'SELECT COUNT(*) FROM '||t.owner || '.' || t.table_name||
        ' WHERE '||t.column_name||' = :1'   
         INTO match_count  
        USING v_search_string; 
      IF match_count > 0 THEN 
        dbms_output.put_line( t.owner || '.' || t.table_name ||' '||t.column_name||' '||match_count );
      END IF; 
    EXCEPTION
      WHEN others THEN
        dbms_output.put_line( 'Error encountered trying to read ' ||
                              t.column_name || ' from ' || 
                              t.owner || '.' || t.table_name );
    END;
  END LOOP;
END;
/

当然，这会非常慢——对于表中的每个字符串列，您都需要对每个表进行一次全面扫描。对于中等大小的表和中等数量的字符串列，这可能需要相当长的时间。