MyBatis调用存储过程执行CRUD

Posted 2020-12-13 myyismyy

输入对象为HashMap:

where stuage=#{stuAge}

用map中的key的值匹配占位符#{stuAge}，如果匹配成功就用map的value替换占位符

Map<String, Object> studentMap=new HashMap<>();
        studentMap.put("stuAge", 23);
        studentMap.put("stuName","lss");
        
        List<Student> students = studentMapper.queryStudentByStuageOrStunameWtihHashMap(studentMap);


<select id="queryStudentByStuageOrStunameWtihHashMap" parameterType="HashMap" resultType="student">
    select stuno,stuname,stuage from student1 where stuage=#{stuAge} or stuname like ‘%${stuName}%‘
</select>

MyBatis调用存储过程

mapper.xml->mapper接口->测试方法

1.查询某个年级的学生总数

输入:年级

输出:该年级的学生总数

create or replace procedure queryCountByGradeWithProcedure(gName in varchar,scount out number)
as begin
select count(1) into scount from student1 where graname=gname;
end;
/
//创建存储过程

<select id="queryCountByGradeWithProcedure" statementType="CALLABLE"  parameterType="HashMap">
        {
            CALL queryCountByGradeWithProcedure(
            #{gName,jdbcType=VARCHAR,mode=IN},
            #{sCount,jdbcType=INTEGER,mode=OUT}
            )
        }
</select>

//其中通过statementType="CALLABLE"设置Sql的执行方式是存储过程，存储过程的输出参数gName需要通过HashMap

Map<String, Object> params=new HashMap<>();
            params.put("gName", "g1");//指定存储过程的输入参数的gName的值是g1
            
studentMapper.queryCountByGradeWithProcedure(params);
//获取存储过程的输出参数
int count=(int) params.get("sCount");

//在使用时,通过hashmap的put方法传入输入参数的值，通过hashmap的get方法获取输出参数的值

No enum constant org.apache.ibatis.type.JdbcType.xxx，则说明mybatis不支持xx类型,需要查表

2.根据学号删除学生

create or replace procedure deleteBysnoWithProcedure(sno in number)
as
begin
delete from student1 where stuno=sno;
end;
/

存储过程无论输入参数是什么值,语法上都需要map来传递该值

只要是<transactionManager type="JDBC"/>，则增删改都需要手工commit

<!--通过存储过程删除  -->
<delete id="deleteBysnoWithProcedure" statementType="CALLABLE" parameterType="HashMap">
    {
        CALL deleteBysnoWithProcedure(
            #{sno,jdbcType=INTEGER,mode=IN}
        )
    }
</delete>


Map<String, Object> map=new HashMap<>();
map.put("sno", "3");
                
studentMapper.deleteBysnoWithProcedure(map);
session.commit();