mysql 存储过程动态执行sql语句

之前经常在程序中拼接sql语句，其实我们也可以在存储过程中拼接sql 语句，动态的执行~~

代码如下：

DROP PROCEDURE IF EXISTS SearchByDoctor;
CREATE PROCEDURE SearchByDoctor(
IN DoctorId VARCHAR(50),
IN deptId VARCHAR(50),
IN beginDate VARCHAR(20),
IN endDate VARCHAR(20),
IN StandDeptId VARCHAR(50),
IN OperationFlag VARCHAR(50),
IN SsczflId VARCHAR(50),
OUT OperNum INT,
OUT AvgDangerIndex DOUBLE,
OUT OperGrCase INT
)
BEGIN
DECLARE cal1 VARCHAR(800);
DECLARE cal2 VARCHAR(800);

SET cal1="SELECT COUNT(1),AVG(DANGER_INDEX) INTO @para1,@para2 FROM yw_ssxxb WHERE 1=1 ";
SET cal2="SELECT COUNT(1) INTO @para3 FROM gr_grbw WHERE OPE_RELID IN (SELECT RELID FROM yw_ssxxb WHERE 1=1";

#拼接医生id
SET cal1=CONCAT(cal1," ","AND OPEDOC_ID = ","'",DoctorId,"'");
SET cal2=CONCAT(cal2," ","AND OPEDOC_ID = ","'",DoctorId,"'");

#拼接科室id
IF deptId <>'' THEN
SET cal1=CONCAT(cal1,"AND DEPT_ID =","'",deptId,"'");
END IF;

#拼接开始结束日期
IF beginDate<>'' AND endDate <>'' THEN
SET cal1=CONCAT(cal1," ","AND OPER_AT BETWEEN ","'",beginDate,"'"," AND ","'",endDate,"'");
END IF;

#拼接标准科室
IF StandDeptId<>'' THEN
SET cal1=CONCAT(cal1," ","AND DEPT_ID IN ( SELECT ID FROM department WHERE STAND_DEPT_ID = ","'",StandDeptId,"'",")");
END IF;

#拼接数据来源
IF OperationFlag <>'' THEN
SET cal1=CONCAT(cal1," ","AND OPEPARTKINDID IN (SELECT ID FROM zh_ssczfl WHERE FLAG= ","'",OperationFlag,"'",")");
END IF;

#拼接手术操作类别
IF SsczflId <> '' THEN
SET cal1=CONCAT(cal1," ","AND OPEPARTKINDID = ","'",SsczflId,"'");
END IF;

SET cal2 =CONCAT(cal2,")");

SET @sql1=cal1;
SET @sql2=cal2;

PREPARE stmt1 FROM @sql1;
EXECUTE stmt1;
DEALLOCATE PREPARE stmt1 ;

PREPARE stmt2 FROM @sql2;
EXECUTE stmt2;
DEALLOCATE PREPARE stmt2 ;

SET OperNum=@para1;
SET AvgDangerIndex=@para2;
SET OperGrCase=@para3;

END;

涉及到的具体的业务逻辑就不介绍了，语法方面还是可以参照下的。