MyBatis框架学习之增删改查

一、MyBatis jar包

下载mybatis的jar包，本文中使用maven进行管理，配置如下：

<!-- 导入mybatis jar包 -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.2.8</version>
</dependency>
<!-- 导入oraclejar包 -->
<dependency>
<groupId>com.oracle</groupId>
<artifactId>ojdbc6</artifactId>
<version>10.2.0.1.0</version>
</dependency>

其中对于oracle的jar包，需要使用mvn install命令进行安装，需要提前下载好所需要的oraclejar包，具体命令如下：

mvn install:install-file -Dfile=jar包的位置 -DgroupId=pom中groupId -DartifactId=pom中artifactId -Dversion=pom中version -Dpackaging=jar

二、Mybatis xml配置

1、配置数据源mybatis-config.xml：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC"/>
<dataSource type="POOLED">
<property name="driver" value="oracle.jdbc.driver.OracleDriver"/>
<property name="url" value="jdbc:oracle:thin:@localhost:1521:orcl"/>
<property name="username" value="****"/>
<property name="password" value="***"/>
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource="com/mybatis/entity/userMapping.xml"/><!-- 映射文件路径 -->
</mappers>
</configuration>

2、配置实体映射文件userMapping.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="mybatis.testcurd">
<!-- 以下使用实体来进行增删改查 -->
<!-- 插入语句 -->
<insert id="insertUser" parameterType="com.mybatis.entity.User"><!-- 传入的参数的类型 -->
<selectKey resultType="java.lang.Long" keyProperty="id" order="BEFORE">
SELECT user_t_seq.nextval FROM DUAL
</selectKey>
insert into user_t(id,username,password,birthday,email,zipcode,address)
values(#{id},#{username},#{password},#{birthday},#{email},#{zipcode},#{address})
</insert>

<!-- 查询 语句,返回值为list集合-->
<select id="queryUserInfoById" parameterType="long" resultType="com.mybatis.entity.User">
select * from user_t where id = #{id}
</select>

<!-- 更新语句 -->
<update id="updateUserById" parameterType="com.mybatis.entity.User">
update user_t set username=#{username} where id=#{id}
</update>

<!-- 删除语句 -->
<delete id="deleteUserById" parameterType="long">
delete user_t where id = #{id}
</delete>

<!-- 使用map来进行增删改查 -->
<insert id="insertUserByMap" parameterType="map">
<selectKey keyColumn="id" keyProperty="id" order="BEFORE" resultType="java.lang.Long">
select user_t_seq.nextval from dual
</selectKey>
insert into user_t(id,username,password,birthday,email,zipcode,address)
values(#{id},#{username},#{password},#{birthday},#{email},#{zipcode},#{address})
</insert>

<!--使用map传递参数  -->
<select id="selectUserByMap" parameterType="map" resultType="map">
select * from user_t
</select>

<select id="selectOneUserByMap" parameterType="map" resultType="map">
select * from user_t where id= #{id}
</select>

<update id="updateUserByMap" parameterType="map">
update user_t set username=#{username} where id=#{id}
</update>

<delete id="deleteUserByMap" parameterType="map">
delete from user_t where id = #{id}
</delete>
</mapper>

3、进行测试，测试代码如下：

private SqlSession session = null;

@Before
public void before(){
SqlSessionFactory factory = SqlSessionFactoryUtil.getSqlSessionFactory();
if(factory != null){
session = factory.openSession();
}
}

@Test
public void insert(){
User user = new User();
user.setUsername("张三");
user.setPassword("zhangsan123");
user.setAddress("上海市浦东新区周家渡");
try {
user.setBirthday(new SimpleDateFormat("yyyy-MM-dd").parse("1990-08-03"));
} catch (ParseException e) {
e.printStackTrace();
}
user.setZipcode("217651");
user.setEmail("zhangsan@126.com");
if(session != null){
session.insert("mybatis.testcurd.insertUser",user);
}
}

@Test
public void testQueryById(){
if(session != null){
List<User> lists = session.selectList("mybatis.testcurd.queryUserInfoById", 1L);
for(User user:lists){
System.out.println("id:" + user.getId() + ",username:" + user.getUsername() + ",password："+
user.getPassword() + ",address:" + user.getAddress() +
",email:" + user.getEmail() + ",zipcode:" + user.getZipcode());
}
}
}

@Test
public void testUpdateById(){
User user = new User();
user.setId(1);
user.setUsername("张三三");
if(session != null){
session.update("mybatis.testcurd.updateUserById", user);
}
}

@Test
public void testDeleteById(){
if(session != null){
session.delete("mybatis.testcurd.deleteUserById",1l);
}
}

//使用map来进行数据的增 删 改 查
@Test
public void testInsertUserMap(){
Map map = new HashMap();
map.put("username", "lisi");
map.put("password", "lisi123");
map.put("address", "上海市黄浦区南京东路");
map.put("email", "lisi@126.com");
map.put("zipcode", "123456");
try {
map.put("birthday", new SimpleDateFormat("yyyy-MM-dd").parse("1990-08-02"));
} catch (ParseException e) {
e.printStackTrace();
}
if(session != null){
session.insert("mybatis.testcurd.insertUserByMap", map);
}
}
//使用map进行查询
@Test
public void testSelectUserByMap(){
if(session != null){
//查询所有
Map map = session.selectMap("mybatis.testcurd.selectUserByMap","username");
Set<String> keys = map.keySet();
for(String key:keys){
Map mapValue = (Map) map.get(key);
System.out.println("id:" + mapValue.get("ID") + ",username:" + mapValue.get("USERNAME") + ",password："+
mapValue.get("PASSWORD") + ",address:" + mapValue.get("ADDRESS") +
",email:" + mapValue.get("EMAIL") + ",zipcode:" + mapValue.get("ZIPCODE"));
}
Map condition = new HashMap();
condition.put("id", 21);
Map oneMap = session.selectMap("mybatis.testcurd.selectOneUserByMap", condition,"username");
Set<String> oneMapKeys = map.keySet();
for(String key:oneMapKeys){
Map mapValue = (Map) map.get(key);
System.out.println("id:" + mapValue.get("ID") + ",username:" + mapValue.get("USERNAME") + ",password："+
mapValue.get("PASSWORD") + ",address:" + mapValue.get("ADDRESS") +
",email:" + mapValue.get("EMAIL") + ",zipcode:" + mapValue.get("ZIPCODE"));
}
}
}

//使用map进行更新
@Test
public void testUpdateUserByMap(){
Map map = new HashMap();
map.put("id",22);
map.put("username", "李四");
if(session != null){
session.update("mybatis.testcurd.updateUserByMap", map);
}
}

@Test
public void testDeleteUserByMap(){
Map map = new HashMap();
map.put("id",22);
if(session != null){
session.delete("mybatis.testcurd.deleteUserByMap",map);
}
}

@After
public void after(){
if(session != null){
session.commit();//session需要commit 否则无法尽心提交
session.close();
}
}

4、mybatis的结构如下图所示：