DROP PROCEDURE IF EXISTS pr_pager;
CREATE PROCEDURE pr_pager(
IN p_table_name VARCHAR(1024),
IN p_fields VARCHAR(1024),
IN p_page_size INT,
IN p_page_now INT,
IN p_order_string VARCHAR(128),
IN p_where_string VARCHAR(1024),
OUT p_out_rows INT
)
NOT DETERMINISTIC
SQL SECURITY DEFINER
COMMENT '分页存储过程'
BEGIN
/*定义变量*/
DECLARE m_begin_row INT DEFAULT 0;
DECLARE m_limit_string CHAR(64);
/*构造语句*/
SET m_begin_row = (p_page_now - 1) * p_page_size;
SET m_limit_string = CONCAT(' LIMIT ', m_begin_row, ', ', p_page_size);
SET @COUNT_STRING = CONCAT('SELECT COUNT(*) INTO @ROWS_TOTAL FROM ', p_table_name, ' ', p_where_string);
SET @MAIN_STRING = CONCAT('SELECT ', p_fields, ' FROM ', p_table_name, ' ', p_where_string, ' ', p_order_string, m_limit_string);
/*预处理*/
PREPARE count_stmt FROM @COUNT_STRING;
EXECUTE count_stmt;
DEALLOCATE PREPARE count_stmt;
SET p_out_rows = @ROWS_TOTAL;
PREPARE main_stmt FROM @MAIN_STRING;
EXECUTE main_stmt;
DEALLOCATE PREPARE main_stmt;
END