MySQL中建立操作函数和存储过程的命令

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1. 建立存储过程
CREATE PROCEDURE p (OUT ver_param VARCHAR(25), INOUT incr_param INT)
BEGIN
# Set value of OUT parameter
SELECT VERSION() INTO ver_param;
# Increment value of INOUT parameter
SET incr_param = incr_param + 1;
END;

2. 对存储过程调用
mysql> SET @increment = 10;
mysql> CALL p(@version, @increment);
mysql> SELECT @version, @increment;

3. 建立函数
mysql> CREATE FUNCTION metaphon RETURNS STRING SONAME 'udf_example.so';
mysql> CREATE FUNCTION myfunc_double RETURNS REAL SONAME 'udf_example.so';
mysql> CREATE FUNCTION myfunc_int RETURNS INTEGER SONAME 'udf_example.so';
mysql> CREATE FUNCTION lookup RETURNS STRING SONAME 'udf_example.so';
mysql> CREATE FUNCTION reverse_lookup
-> RETURNS STRING SONAME 'udf_example.so';
mysql> CREATE AGGREGATE FUNCTION avgcost
-> RETURNS REAL SONAME 'udf_example.so';

4. 删除函数或者存储过程

DROP {PROCEDURE | FUNCTION} [IF EXISTS] sp_name
mysql> DROP FUNCTION metaphon;
mysql> DROP FUNCTION myfunc_double;
mysql> DROP FUNCTION myfunc_int;
mysql> DROP FUNCTION lookup;
mysql> DROP FUNCTION reverse_lookup;
mysql> DROP FUNCTION avgcost;

5. 修改存储过程何函数

ALTER {PROCEDURE | FUNCTION} sp_name [characteristic ...]

{ CONTAINS SQL | NO SQL | READS SQL DATA | MODIFIES SQL DATA }
| SQL SECURITY { DEFINER | INVOKER }
| COMMENT 'string'