mysql sp_add_Index 先判断有没有索引 没有就添加

DELIMITER $$

CREATE PROCEDURE `sp_add_Index`(

IN p_tablename VARCHAR (100),

IN p_indexType VARCHAR(100),

IN p_indexcolumnList VARCHAR (200),

IN p_idxname VARCHAR(70)

)

BEGIN

DECLARE p_dbname VARCHAR(50);

SET @p_dbname = DATABASE();

SET @p_idxname = p_idxname; -- 索引名不能超过64字节

CASE p_indexType

WHEN 'primary' THEN

SET @p_idxname = 'primary';

SET @add_index = CONCAT('ALTER TABLE ', p_tablename, ' ADD ', 'primary key(', p_indexcolumnList ,');');

WHEN 'unique' THEN

IF LENGTH(@p_idxname) = 0 THEN

SET @p_idxname = CONCAT('uni_idx_',p_tablename,'_',REPLACE(p_indexcolumnList,',','_'));

END IF;

SET @add_index = CONCAT('ALTER TABLE ', p_tablename, ' ADD ', p_indexType,' ',@p_idxname ,'(', p_indexcolumnList ,');');

ELSE

IF LENGTH(@p_idxname) = 0 THEN

SET @p_idxname = CONCAT('IDX_',p_tablename,'_',REPLACE(p_indexcolumnList,',','_'));

END IF;

SET @add_index = CONCAT('ALTER TABLE ', p_tablename, ' ADD ', p_indexType,' ',@p_idxname ,'(', p_indexcolumnList ,');');

END CASE;

SELECT

COUNT(*) INTO @cnt

FROM

information_schema.statistics

WHERE

TABLE_SCHEMA = @p_dbname

AND table_name = p_tablename

AND index_name = @p_idxname;

IF @cnt = 0 THEN

PREPARE stmt FROM @add_index; EXECUTE stmt;

END IF;

END$$

DELIMITER ;