在 MySQL 中显示过程代码

Question

我试图显示一个名为的存储过程的 SQL 代码add_pixel：

mysql> SHOW PROCEDURE CODE add_pixel;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1

我已确保该程序存在：

mysql> CALL add_pixel();
ERROR 1318 (42000): Incorrect number of arguments for PROCEDURE pixels.add_pixel; expected 3, got 0

和SHOW CREATE PROCEDURE作品：

mysql> SHOW CREATE PROCEDURE add_pixel;
+-----------+----------+------------------+----------------------+----------------------+--------------------+
| Procedure | sql_mode | Create Procedure | character_set_client | collation_connection | Database Collation |
+-----------+----------+------------------+----------------------+----------------------+--------------------+
| add_pixel |          | NULL             | utf8                 | utf8_general_ci      | utf8_unicode_ci    |
+-----------+----------+------------------+----------------------+----------------------+--------------------+
1 row in set (0.00 sec)

并且我的 MySQL 版本支持`SHOW PROCEDURE（在 MySQL 5.0.17 中添加了 SHOW PROCEDURE CODE）。

如何查看程序的源 SQL 代码？

Answer 1

编辑

令人惊讶的是，INFORMATION_SCHEMA.ROUTINES 它没有 param-list 列。

您可以使用mysql.proc. 例如，看我的一个程序：

SELECT * FROM mysql.proc WHERE name='run' \G
*************************** 1. row ***************************
                  db: common_schema
                name: run
                type: PROCEDURE
       specific_name: run
            language: SQL
     sql_data_access: MODIFIES_SQL_DATA
    is_deterministic: YES
       security_type: INVOKER
          param_list:
  in query_script text

             returns:
                body: main_body: begin
  if (LEFT(query_script, 1) in ('/', '\\')) and (LEFT(query_script, 2) != '/*') then
    begin
          declare query_script_file_name text;

      set query_script_file_name := query_script;
      set query_script := LOAD_FILE(query_script_file_name);
      if query_script is null then
        call throw(CONCAT('Cannot load script file: ', query_script_file_name));
      end if;
    end;
  end if;
  call _interpret(query_script, TRUE);
end
             definer: root@localhost
             created: 2012-08-17 17:24:46
            modified: 2012-08-17 17:24:46
            sql_mode:
             comment: Run given QueryScript text
character_set_client: utf8
collation_connection: utf8_general_ci
        db_collation: latin1_swedish_ci
           body_utf8: main_body: begin
  if (LEFT(query_script, 1) in ('/', '\')) and (LEFT(query_script, 2) != '/*') then
    begin
          declare query_script_file_name text;

      set query_script_file_name := query_script;
      set query_script := LOAD_FILE(query_script_file_name);
      if query_script is null then
        call throw(CONCAT('Cannot load script file: ', query_script_file_name));
      end if;
    end;
  end if;
  call _interpret(query_script, TRUE);
end

寻找param_list专栏（我相信这是您的主要关注点）。还要寻找db, name, type。

==================

或者，可以使用INFORMATION_SCHEMA.ROUTINES. 例如，看我的一个程序：

SELECT * FROM INFORMATION_SCHEMA.ROUTINES WHERE ROUTINE_NAME='run' \G
*************************** 1. row ***************************
       SPECIFIC_NAME: run
     ROUTINE_CATALOG: NULL
      ROUTINE_SCHEMA: common_schema
        ROUTINE_NAME: run
        ROUTINE_TYPE: PROCEDURE
      DTD_IDENTIFIER: NULL
        ROUTINE_BODY: SQL
  ROUTINE_DEFINITION: main_body: begin
  if (LEFT(query_script, 1) in ('/', '\')) then
    begin
          declare query_script_file_name text;

      set query_script_file_name := query_script;
      set query_script := LOAD_FILE(query_script_file_name);
      if query_script is null then
        call throw(CONCAT('Cannot load script file: ', query_script_file_name));
      end if;
    end;
  end if;
  call _interpret(query_script, TRUE);
end
       EXTERNAL_NAME: NULL
   EXTERNAL_LANGUAGE: NULL
     PARAMETER_STYLE: SQL
    IS_DETERMINISTIC: YES
     SQL_DATA_ACCESS: MODIFIES SQL DATA
            SQL_PATH: NULL
       SECURITY_TYPE: INVOKER
             CREATED: 2012-08-17 17:24:46
        LAST_ALTERED: 2012-08-17 17:24:46
            SQL_MODE: 
     ROUTINE_COMMENT: Run given QueryScript text
             DEFINER: root@localhost
CHARACTER_SET_CLIENT: utf8
COLLATION_CONNECTION: utf8_general_ci
  DATABASE_COLLATION: latin1_swedish_ci

特别是，查看列ROUTINE_SCHEMA, ROUTINE_NAME, ROUTINE_TYPE, ROUTINE_DEFINITION。这些提供了大部分有趣的数据。