Mybatis基于注解实现增删查改和多参数列表查询
林炳文Evankaka原创作品。转自https://blog.csdn.net/Evankaka/article/details/45744243
在【Mybatis】Mybatis入门概述及第一个Mybatis实例实现增删改查 和【Mybatis】Mybatis接口编程方式实现增删改查 演示了如何使用XML来操作Mybatis实现CRUD，但是大量的XML配置文件的编写是非常烦人的。因此Mybatis也提供了基于注解的配置方式，下面我们来演示一下使用接口加注解来实现CRUD的的例子。
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一、创建数据库、数据表
-
use
test;
-
create
table t_employeer(
-
employeer_id
int
not
null primary
key AUTO_INCREMENT ,
-
employeer_name
varchar(
50)
default
null,
-
employeer_age
int
default
null,
-
employeer_department
varchar(
100)
default
null,
-
employeer_worktype
varchar(
100)
default
null
-
)
二、创建工程
整个工程目录如下：
记得要导入相应的包！
1、雇员对应的类Employeer.java
-
package com.mucfc.model;
-
/**
-
* 雇员信息类
-
*@author linbingwen
-
*@time 2015.5.11
-
*/
-
public
class Employeer {
-
private Integer employeer_id;
-
private String employeer_name;
-
private Integer employeer_age ;
-
private String employeer_department;
-
private String employeer_worktype;
-
-
public Employeer() {
-
super();
-
}
-
public Integer getEmployeer_id() {
-
return employeer_id;
-
}
-
public void setEmployeer_id(Integer employeer_id) {
-
this.employeer_id = employeer_id;
-
}
-
public String getEmployeer_name() {
-
return employeer_name;
-
}
-
public void setEmployeer_name(String employeer_name) {
-
this.employeer_name = employeer_name;
-
}
-
public Integer getEmployeer_age() {
-
return employeer_age;
-
}
-
public void setEmployeer_age(Integer employeer_age) {
-
this.employeer_age = employeer_age;
-
}
-
public String getEmployeer_department() {
-
return employeer_department;
-
}
-
public void setEmployeer_department(String employeer_department) {
-
this.employeer_department = employeer_department;
-
}
-
public String getEmployeer_worktype() {
-
return employeer_worktype;
-
}
-
public void setEmployeer_worktype(String employeer_worktype) {
-
this.employeer_worktype = employeer_worktype;
-
}
-
@Override
-
public String toString() {
-
return
"Employeer [employeer_id=" + employeer_id +
", employeer_name="
-
+ employeer_name +
", employeer_age=" + employeer_age
-
+
", employeer_department=" + employeer_department
-
+
", employeer_worktype=" + employeer_worktype +
"]";
-
}
-
-
-
-
}
-
xml version="1.0" encoding="UTF-8" ?>
-
-
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
-
<mapper namespace="com.mucfc.dao.EmployeerMapper">
-
-
-
<resultMap type="Employeer" id="employeerResultMap">
-
<id property="employeer_id" column="employeer_id"/>
-
<result property="employeer_name" column="employeer_name"/>
-
<result property="employeer_age" column="employeer_age"/>
-
<result property="employeer_department" column="employeer_department"/>
-
<result property="employeer_worktype" column="employeer_worktype"/>
-
resultMap>
-
-
mapper>
2、配置mybatis-config.xml
-
xml version="1.0" encoding="UTF-8" ?>
-
-
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
-
"http://mybatis.org/dtd/mybatis-3-config.dtd">
-
-
<configuration>
-
-
<typeAliases>
-
<typeAlias alias="Employeer" type="com.mucfc.model.Employeer"/>
-
typeAliases>
-
-
-
<environments default="development">
-
<environment id="development">
-
<transactionManager type="JDBC" />
-
<dataSource type="POOLED">
-
<property name="driver" value="com.mysql.jdbc.Driver"/>
-
<property name="url" value="jdbc:mysql://localhost:3306/test?characterEncoding=UTF-8"/>
-
<property name="username" value="root"/>
-
<property name="password" value="christmas258@"/>
-
dataSource>
-
environment>
-
environments>
-
-
-
<mappers>
-
<mapper resource="com/mucfc/model/Employeer.xml" />
-
mappers>
-
configuration>
3、EmployeerMapper.java在添加Sql映射语句，使用注解的方式来实现
-
package com.mucfc.dao;
-
-
import java.util.List;
-
import java.util.Map;
-
-
import org.apache.ibatis.annotations.Delete;
-
import org.apache.ibatis.annotations.Insert;
-
import org.apache.ibatis.annotations.ResultMap;
-
import org.apache.ibatis.annotations.Select;
-
import org.apache.ibatis.annotations.SelectKey;
-
import org.apache.ibatis.annotations.Update;
-
-
import com.mucfc.model.Employeer;
-
-
/**
-
* SQL语句映射类
-
* @author linbingwen
-
* @time 2015.5.11
-
*/
-
public
interface EmployeerMapper {
-
@Select(
"select * from `t_employeer` where employeer_name like #{employeer_name}")
-
@ResultMap(
"employeerResultMap")
-
public List
findEmployeerByName(String employeer_name) ;
-
-
@Select(
"select* from `t_employeer` where employeer_name=#{0} and employeer_department=#{1}")
-
@ResultMap(
"employeerResultMap")
-
-
public List
findEmployeerByNameandDep(String employeer_name,String employeer_department) ;
-
@ResultMap(
"employeerResultMap")
-
@Select(
"select* from `t_employeer` where employeer_name=#{key1} and employeer_department=#{key2}")
-
public List
findEmployeerByNameandDep1(Map map) ;
-
-
-
-
@Select(
"select* from `t_employeer` where employeer_id =#{id}")
-
@ResultMap(
"employeerResultMap")
-
public Employeer findEmployeerByID(int id);
-
-
@Insert(
" insert into `t_employeer`(employeer_name,employeer_age,employeer_department,employeer_worktype) values(#{employeer_name},#{employeer_age},#{employeer_department},#{employeer_worktype})")
-
public void addEmployeer(Employeer employeer);
-
-
@Delete(
"delete from `t_employeer` where employeer_id = #{employeer_id}")
-
public void deleteEmployeer(int id);
-
-
@Update(
" update t_employeer set employeer_name = #{employeer_name},employeer_age= #{employeer_age},employeer_department = #{employeer_department} ,employeer_worktype=#{employeer_worktype} where employeer_id = #{employeer_id} ")
-
public void updateEmployeer(Employeer employeer);
-
-
}
（1）单参数查找
-
/**
-
* 查找
-
*/
-
public static Employeer findEmployeerById(int id) {
-
SqlSession session =
null;
-
Employeer employeer=
null;
-
try {
-
session = sqlSessionFactory.openSession();
-
EmployeerMapper employeerMapper=session.getMapper(EmployeerMapper.class);
-
employeer=employeerMapper.findEmployeerByID(id);
-
}
finally {
-
session.close();
-
}
-
return employeer;
-
}
-
@Select(
"select* from `t_employeer` where employeer_id =#{id}")
-
@ResultMap(
"employeerResultMap")
-
public Employeer findEmployeerByID(int id);
调用：
-
System.out.println(findEmployeerById(
10));
-
System.out.println(findEmployeerById(
11));
结果：
（2） 添加
-
/**
-
* 增加
-
*/
-
public static void addEmployeer(Employeer employeer){
-
SqlSession session =
null;
-
try {
-
session = sqlSessionFactory.openSession();
-
EmployeerMapper employeerMapper=session.getMapper(EmployeerMapper.class);
-
employeerMapper.addEmployeer(employeer);
-
session.commit() ;
-
}
finally {
-
session.close();
-
}
-
-
}
-
@Insert(
" insert into `t_employeer`(employeer_name,employeer_age,employeer_department,employeer_worktype) values(#{employeer_name},#{employeer_age},#{employeer_department},#{employeer_worktype})")
-
public void addEmployeer(Employeer employeer);
-
（3）更改
-
/**
-
* 更改
-
*/
-
public static void updateEmployeer(Employeer employeer){
-
SqlSession session =
null;
-
try {
-
session = sqlSessionFactory.openSession();
-
EmployeerMapper employeerMapper=session.getMapper(EmployeerMapper.class);
-
employeerMapper.updateEmployeer(employeer);
-
session.commit() ;
-
}
finally {
-
session.close();
-
}
-
-
}
-
-
@Update(
" update t_employeer set employeer_name = #{employeer_name},employeer_age= #{employeer_age},employeer_department = #{employeer_department} ,employeer_worktype=#{employeer_worktype} where employeer_id = #{employeer_id} ")
-
public void updateEmployeer(Employeer employeer);
（4）删除
-
/**
-
* 删除
-
*
-
*/
-
public static void deleteEmployeer(int id){
-
SqlSession session =
null;
-
try {
-
session = sqlSessionFactory.openSession();
-
EmployeerMapper employeerMapper=session.getMapper(EmployeerMapper.class);
-
employeerMapper.deleteEmployeer(id);
-
session.commit() ;
-
}
finally {
-
session.close();
-
}
-
}
对应SQL语句：
-
@Delete(
"delete from `t_employeer` where employeer_id = #{employeer_id}")
-
public void deleteEmployeer(int id);
（5）列表查询
-
/**
-
* 单参数查询列表
-
*/
-
public static List
getEmployeerList(String employeer_name) {
-
SqlSession session =
null;
-
List
employeers=
null;
-
try {
-
session = sqlSessionFactory.openSession();
-
EmployeerMapper employeerMapper=session.getMapper(EmployeerMapper.class);
-
employeers = employeerMapper.findEmployeerByName(employeer_name);
-
session.commit() ;
-
}
finally {
-
session.close();
-
}
-
return employeers;
-
-
}
-
/**
-
* 多参数查询列表
-
*/
-
public static List
getEmployeerList(String employeer_name,String employeer_department) {
-
SqlSession session =
null;
-
List
employeers=
null;
-
try {
-
session = sqlSessionFactory.openSession();
-
EmployeerMapper employeerMapper=session.getMapper(EmployeerMapper.class);
-
employeers = employeerMapper.findEmployeerByNameandDep(employeer_name, employeer_department);
-
session.commit() ;
-
}
finally {
-
session.close();
-
}
-
return employeers;
-
-
}
-
/**
-
* 多参数查询列表，使用map
-
*/
-
public static List
getEmployeerList(Map map) {
-
SqlSession session =
null;
-
List
employeers=
null;
-
try {
-
session = sqlSessionFactory.openSession();
-
EmployeerMapper employeerMapper=session.getMapper(EmployeerMapper.class);
-
employeers = employeerMapper.findEmployeerByNameandDep1(map);
-
session.commit() ;
-
}
finally {
-
session.close();
-
}
-
return employeers;
-
-
}
-
@Select(
"select * from `t_employeer` where employeer_name like #{employeer_name}")
-
@ResultMap(
"employeerResultMap")
-
public List
findEmployeerByName(String employeer_name) ;
-
-
@Select(
"select* from `t_employeer` where employeer_name=#{0} and employeer_department=#{1}")
-
@ResultMap(
"employeerResultMap")
-
public List
findEmployeerByNameandDep(String employeer_name,String employeer_department) ;
-
@ResultMap(
"employeerResultMap")
-
@Select(
"select* from `t_employeer` where employeer_name=#{key1} and employeer_department=#{key2}")
-
public List
findEmployeerByNameandDep1(Map map) ;
-
-
-
@Select(
"select* from `t_employeer` where employeer_id =#{id}")
-
@ResultMap(
"employeerResultMap")
-
public Employeer findEmployeerByID(int id);
测试：
-
System.out.println(
"=========================使用单参数查询===========================");
-
List
employeers=getEmployeerList(
"张三");
-
for(Employeer employeer:employeers){
-
System.out.println(employeer);
-
}
-
System.out.println(
"=========================使用多单参数查询===========================");
-
List
employeers1=getEmployeerList(
"张三",
"产品二部");
-
for(Employeer employeer1:employeers1){
-
System.out.println(employeer1);
-
}
-
System.out.println(
"=========================使用多单参数map方式查询===========================");
-
Map
map =
new HashMap();
-
map.put(
"key1",
"明明");
-
map.put(
"key2",
"财会部");
-
List
employeers2=getEmployeerList(map);
-
for(Employeer employeer2:employeers2){
-
System.out.println(employeer2);
-
}
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