MySQL 带INOUT参数执行搜索提示的存储过程

DELIMITER $$

USE `b10k`$$

DROP PROCEDURE IF EXISTS `sp_suggest`$$

CREATE DEFINER=`luth`@`%` PROCEDURE `sp_suggest`(
IN 	query_column	VARCHAR(100),   /*被检索的字段名*/
IN      keyword		VARCHAR(100),	/*检索的关键字*/
IN 	table_name	VARCHAR(100),	/*被检索的表名*/
INOUT 	result_count	INT		/*要取出匹配记录的数量*/
)
COMMENT '执行关键字搜索'
BEGIN
/*定义变量*/
DECLARE m_begin_row INT DEFAULT 0;
DECLARE m_where_string CHAR(128);
DECLARE m_order_string CHAR(128);
DECLARE m_limit_string CHAR(64);

/*构造语句*/
SET m_begin_row = result_count;
SET m_where_string = CONCAT(' WHERE ', query_column, ' LIKE \'', keyword, '%\' ');
SET m_order_string = CONCAT(' ORDER BY ', query_column);
SET m_limit_string = CONCAT(' LIMIT ', result_count);

SET @COUNT_STRING = CONCAT('SELECT DISTINCT COUNT(*) INTO @ROWS_TOTAL FROM ', table_name, ' ', m_where_string, ' ', m_order_string, ' ', m_limit_string);
SET @MAIN_STRING = CONCAT('SELECT DISTINCT ', query_column, ' FROM ', table_name, ' ', m_where_string, ' ', m_order_string, ' ', m_limit_string);

/*预处理*/
PREPARE count_stmt FROM @COUNT_STRING;
EXECUTE count_stmt;
DEALLOCATE PREPARE count_stmt;
SET result_count = @ROWS_TOTAL;

PREPARE main_stmt FROM @MAIN_STRING;
EXECUTE main_stmt;
DEALLOCATE PREPARE main_stmt;
END$$

DELIMITER ;

/*调用*/
SET @aa=10;
CALL sp_suggest('latin_name','A','species',@aa);
SELECT @aa;