MySQL INOUTパラメータによる検索プロンプトの格納プロセス

DELIMITER $$

USE `b10k`$$

DROP PROCEDURE IF EXISTS `sp_suggest`$$

CREATE DEFINER=`luth`@`%` PROCEDURE `sp_suggest`(
	IN 	query_column	VARCHAR(100),   /*       */
	IN      keyword		VARCHAR(100),	/*      */
	IN 	table_name	VARCHAR(100),	/*      */
	INOUT 	result_count	INT		/*          */
    )
COMMENT '       '
BEGIN
    /*    */
    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);

    
    /*    */    
    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);
    
    /*   */
    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 ;

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