MyBatis映射文件（集合数据的添加与获取，条件查询，模糊查询）

MyBatis映射文件（集合数据的添加与获取，条件查询，模糊查询）

继续上次的MyBatis的映射文件，

EmployeeMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.cn.mybatis.dao.EmployeeMapper">

   <!-- public List<Employee> getEmpsByLastNameLike(String name); -->
         <!-- restuletType: 如果返回的是一个集合，要写集合元素的类型 -->
         <select id="getEmpsByLastNameLike" resultType="com.cn.zhu.bean.Employee">
	  select * from tbl_employee
		where  last_name like  #{lastName}
	</select>
	<!--
		namespace: 名称空间 id：唯一标识 resultType： 返回值类型 #{id} 从传递过来的参数中取出id
	-->
	<select id="getEmpByMap" resultType="com.cn.zhu.bean.Employee">
	  select * from tbl_employee
		where id = #{id} and last_name=#{lastName}
	</select>
	
	<select id="getEmpByIdAndLastName" resultType="com.cn.zhu.bean.Employee">
	  select * from tbl_employee
		where id = #{id} and last_name=#{lastName}
	</select>
	
	<select id="getEmpById" resultType="com.cn.zhu.bean.Employee">
		select * from tbl_employee
		where id = #{id}
</select>
  <!-- 
      mysql自增主键，主键主键值的获取，mybatis也是利用statement.getGenreatedKeys()
       useGeneratedKeys="true"  使用自增主键获取主键值策略
       keyProperty:  指定对应的主键属性，也就是mybatis获取到主键值以后，将这个
                 值封装到javaBean的哪个属性
   -->
	<insert id="addEmp" parameterType="com.cn.zhu.bean.Employee"
	 useGeneratedKeys="true" keyProperty="id">
	   insert into tbl_employee(last_name,gender,email) values(#{lastName},#{gender},#{email})
	</insert>
	<!-- 
	   Orcal不支持自增，Orcal使用序列来模拟自增
	   每次插入的数据的主键是从序列中拿到的值，如何获取到这个值	
	 -->
	  <insert id="">
	    <!-- keyProperty  查出的主键值封装给javaBean哪个属性 
	         order="BEFORE" ：当前sql插在sql之前运行
	         resultType : 查出数据的返回值类型
	    -->
	    <selectKey keyProperty="id" order="BEFORE" resultType="integer">
	       <!-- 编写主键的sql语句 -->
	       
	       select EMPLOYEES_SEQ.nextval  from dual
	    </selectKey>
	    <!-- 插入时的主键是从序列中拿到的 -->
	      insert into  employees(EMPLOYEE_ID,LAST_NAME,EMATL)
	      VALUES (#{ID},#{lastname},#{email})
	  </insert>
	 
	<update id="updateEmp">
	  update tbl_employee set last_name=#{lastName},gender=#{gender},email=#{email}
	   where id=#{id}
	</update>
	<delete id="deleteEmp">
	   delete  from tbl_employee where id=#{id}
	</delete>
</mapper>

EmployeeMapper.java

package com.cn.mybatis.dao;

import java.util.List;
import java.util.Map;

import org.apache.ibatis.annotations.Param;

import com.cn.zhu.bean.Employee;

public interface EmployeeMapper {
	public Employee getEmpById(int  id);
	public long addEmp(Employee  employee);
	public Boolean updateEmp(Employee  employee);
	public void deleteEmp(int  id);
	//根据两个参数进行查询
	public Employee getEmpByIdAndLastName(@Param("id")Integer id,@Param("lastName")String lastName);
    public Employee getEmpByMap(Map<String, Object> map);
    
    public List<Employee> getEmpsByLastNameLike(String name);
 }

测试方法：

@Test
	public void test05() throws IOException{
		SqlSessionFactory sqlsessionFactory=getSqlSessionFactory();
		// 1  获取到的sqlsession不会自动提交数据
		SqlSession openSession=sqlsessionFactory.openSession();

		try{
			
			EmployeeMapper mapper=openSession.getMapper(EmployeeMapper.class);
			List<Employee> like=mapper.getEmpsByLastNameLike("%zh%");
			for(Employee employee : like ){
				System.out.println(employee);
			}
			
		}finally{
			openSession.commit();
		}
	}

模糊查询的测试结果：