Mybatis Mapper动态代理(示例)
1.创建工程
2.在文件中创建lib文件夹，并引入相关jar包
3.创建数据表![]()
4.创建与表对应的关系映射(domain包)
package com.helong.domain;
import lombok.setter;
import lombok.getter;
@Setter@Getter
public class Customer {
private Integer custId;
private String custName;
private String custProfession;
private String custPhone;
private String email;
@Override
public String toString() {
return "Customer{" +
"custId=" + custId +
", custName='" + custName + '\'' +
", custProfession='" + custProfession + '\'' +
", custPhone='" + custPhone + '\'' +
", email='" + email + '\'' +
'}';
}
}
5.创建资源文件夹，并引入相关配置文件
db.properties:
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis?characterEncoding=utf-8
jdbc.username=root
jdbc.password=xxxxxx
SqlMappingConfig.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>
<!--定义属性及读取配置文件-->
<properties resource="db.properties"/>
<!--配置sql打印-->
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
<!--开启驼峰命名法-->
<!--开启驼峰映射，为自定义的SQL语句服务-->
<!--设置启用数据库字段下划线映射到java对象的驼峰式命名属性，默认是false-->
<setting name="mapUnderscoreToCamelCase" value="true"/>
</settings>
<!--定义别名-->
<typeAliases>
<!--单个别名定义-->
<!--<typeAlias alias="Customer" type="com.helong.domain.Customer"/>-->
<!--批量定义别名, 别名为类名-->
<package name="com.helong.domain"/>
</typeAliases>
<!-- spring整合后 environments配置将废除 使用spring中的连接池 -->
<environments default="development">
<environment id="development">
<!-- 使用jdbc事务管理 -->
<transactionManager type="JDBC" />
<!-- 数据库连接池 -->
<dataSource type="POOLED">
<property name="driver" value="${jdbc.driver}" />
<property name="url"
value="${jdbc.url}" />
<property name="username" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
</dataSource>
</environment>
<environment id="test">
<!-- 使用jdbc事务管理 -->
<transactionManager type="JDBC" />
<!-- 数据库连接池 -->
<dataSource type="POOLED">
<property name="driver" value="${jdbc.driver}" />
<property name="url" value="${jdbc.url}" />
<property name="username" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
</dataSource>
</environment>
</environments>
<!--定义数据库厂商-->
<databaseIdProvider type="DB_VENDOR">
<property name="MySQL" value="mysql"/>
<property name="DB2" value="db2"/>
<property name="Oracle" value="oracle" />
<property name="SQL Server" value="sqlserver"/>
</databaseIdProvider>
<!--加载映射文件-->
<mappers>
<!-- <mapper resource="com/helong/domain/Customer.xml"></mapper>-->
<!--
1.名称必须得要和接口名称一致
2.必须得要和mapper接口在同一目录
-->
<!--<mapper class="com.helong.mapper.CustomerMapper"/>-->
<package name="com.helong.mapper"/>
</mappers>
</configuration>
6.创建表所对应的Mapper类以及其所对应的xml文件(mapper包中)
示例：
CustomerMapper接口：
package com.helong.mapper;
import com.helong.domain.Customer;
import org.apache.ibatis.annotations.Param;
import java.util.Map;
public interface CustomerMapper {
public Customer getCustomerWithID1(@Param("id") Integer id, @Param("name") String name);
public Customer getCustomerWithID2(Map<String, Object> map);
public Customer getCustomerWithID3(Customer customer);
}
CustomerMapper.xml文件：
<?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.helong.mapper.CustomerMapper">
<!--查询用户 ID-->
<select id="getCustomerWithID1" resultType="Customer" >
select * from `customer` where cust_id = #{id} and cust_name=#{name}
</select>
<!--查询用户 ID-->
<select id="getCustomerWithID2" resultType="Customer" databaseId="mysql">
select * from `customer` where cust_id = #{id} and cust_name=#{name}
</select>
<!--查询用户 ID-->
<select id="getCustomerWithID3" resultType="Customer" databaseId="mysql">
select * from `customer` where cust_id = #{custId} and cust_name=#{custName}
</select>
</mapper>
7.创建MybatisUtils工具（utils），便于操作数据库
package com.helong.utils;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import java.io.IOException;
import java.io.InputStream;
public class MybatisUtils {
public static final SqlSessionFactory sessionFactory;
static {
//1.sqlSessionFactoryBuilder 加载配置文件
SqlSessionFactoryBuilder sqlSessionFactoryBuilder = new SqlSessionFactoryBuilder();
//2.读取配置文件
InputStream resourceAsStream = null;
try {
resourceAsStream = Resources.getResourceAsStream("SqlMappingConfig.xml");
} catch (IOException e) {
e.printStackTrace();
}
//3.获取session工厂
sessionFactory = sqlSessionFactoryBuilder.build(resourceAsStream);
}
public static SqlSession openSession(){
return sessionFactory.openSession();
}
}
8.创建测试类（test包）
package com.helong.test;
import com.helong.domain.Customer;
import com.helong.mapper.CustomerMapper;
import com.helong.utils.MybatisUtils;
import org.apache.ibatis.session.SqlSession;
import org.junit.Test;
import java.util.HashMap;
public class MyTest {
@Test
public void test1(){
SqlSession sqlSession = MybatisUtils.openSession();
CustomerMapper mapper = sqlSession.getMapper(CustomerMapper.class);
Customer customer = mapper.getCustomerWithID1(13, "何鑫林");
System.out.println(customer);
sqlSession.close();
}
@Test
public void test2(){
SqlSession sqlSession = MybatisUtils.openSession();
CustomerMapper mapper = sqlSession.getMapper(CustomerMapper.class);
HashMap<String, Object> customerHashMap = new HashMap<>();
customerHashMap.put("id",14);
customerHashMap.put("name","XX");
Customer customer = mapper.getCustomerWithID2(customerHashMap);
System.out.println(customer);
sqlSession.close();
}
@Test
public void test3(){
SqlSession sqlSession = MybatisUtils.openSession();
CustomerMapper mapper = sqlSession.getMapper(CustomerMapper.class);
Customer customer = new Customer();
customer.setCustId(13);
customer.setCustName("何鑫林");
Customer customer1 = mapper.getCustomerWithID3(customer);
System.out.println(customer1);
sqlSession.close();
}
}