?目錄
一、創建資料庫
二、創建mybatis核心組態檔
三、配置pom.xml
四、創建pojo
五、創建工具類獲取SqlSession物件
六、創建Dao層介面
七、創建Dao層所對應的xml檔案
八、撰寫測驗類進行測驗
一、創建資料庫
CREATE DATABASE `mybatis_db` USE `mybatis_db` CREATE TABLE `user`( `id` int(20), `name` VARCHAR(30), `pwd` VARCHAR(30), PRIMARY KEY(`id`) )ENGINE=INNODB DEFAULT CHARSET=utf8; INSERT INTO `user` VALUES (1, 'hongyyds', '123123'), (2, 'shiyu', '110000'), (3, 'feiyu', '666321')
二、創建mybatis核心組態檔
2.1、在maven的資源目錄（resource）中創建mybatis核心組態檔
<?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">
<!--id 標識-->
<environment id="development">
<transactionManager type="JDBC"/>
<dataSource type="POOLED">
<!--mysql驅動程式-->
<property name="driver" value="https://www.cnblogs.com/hongyyds/p/com.mysql.jdbc.Driver"/>
<!--資料庫URL地址-->
<property name="url" value="https://www.cnblogs.com/hongyyds/p/jdbc:mysql://localhost:3306/mybatis_db?useSSl=true&useUnicode=true&characterEncoding=utf-8"/>
<!--mysql賬號-->
<property name="username" value="https://www.cnblogs.com/hongyyds/p/root"/>
<!--mysql密碼-->
<property name="password" value="https://www.cnblogs.com/hongyyds/p/root"/>
</dataSource>
</environment>
</environments>
<!--每一個xml組態檔都需要在mybatis的核心組態檔中注冊才能生效-->
<mappers>
<mapper resource="cong/hong/mapper/UserMapper.xml"/>
</mappers>
</configuration>
三、配置pom.xml
3.1、配置插件junit、mysql和mybatis
<dependencies>
<!-- mysql驅動 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.28</version>
</dependency>
<!-- mybatis驅動 -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.9</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.13</version>
<scope>test</scope>
</dependency>
</dependencies>
3.2、組態檔目錄過濾（解決maven專案檔案不輸出的情況）
<!--解決maven專案檔案不輸出的情況-->
<build>
<resources>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.xml</include>
<include>**/*.properties</include>
</includes>
</resource>
<resource>
<directory>src/main/resources</directory>
<includes>
<include>**/*.xml</include>
<include>**/*.properties</include>
</includes>
</resource>
</resources>
</build>
四、創建pojo
package cong.hong.pojo;
import java.io.Serializable;
public class User implements Serializable {
private String id;
private String name;
private String pwd;
@Override
public String toString() {
return "User{" +
"id='" + id + '\'' +
", name='" + name + '\'' +
", pwd='" + pwd + '\'' +
'}';
}
public User() {
}
public User(String id, String name, String pwd) {
this.id = id;
this.name = name;
this.pwd = pwd;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPwd() {
return pwd;
}
public void setPwd(String pwd) {
this.pwd = pwd;
}
}
五、創建工具類獲取SqlSession物件
package cong.hong.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 {
private static InputStream inputStream;
private static SqlSessionFactory sqlSessionFactory;
static {
try {
//mybatis核心組態檔路徑
String resource = "config.xml";
//讀取組態檔
inputStream = Resources.getResourceAsStream(resource);
//構建SqlSessionFactory類物件
sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
} catch (IOException e) {
e.printStackTrace();
}finally {
if(inputStream != null){
try {
inputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
/**
* @return SqlSession物件
*/
public static SqlSession getSqlSession(){
return sqlSessionFactory.openSession();
}
}
六、創建Dao層介面
package cong.hong.mapper;
import cong.hong.pojo.User;
import java.util.List;
public interface UserMapper {
//或如用戶串列
public List<User> getUserList();
}
七、創建Dao層所對應的xml檔案
7.1、創建xml檔案實作查詢功能
<?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">
<!-- namespace 系結的作業區 Java檔案-->
<mapper namespace="cong.hong.mapper.UserMapper">
<!--select：查詢， id：介面中的要實作的方法名， resultType：回傳值的型別（泛型中的型別） -->
<select id="getUserList" resultType="cong.hong.pojo.User">
select * from mybatis_db.user
</select>
</mapper>
7.2、在MyBatis核心組態檔中注冊xml檔案
注：每一個Dao層介面物件對應的xml檔案都需要在MyBatis的核心組態檔中進行才能生效！！
<?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">
<!--id 標識-->
<environment id="development">
<transactionManager type="JDBC"/>
<dataSource type="POOLED">
<!--mysql驅動程式-->
<property name="driver" value="https://www.cnblogs.com/hongyyds/p/com.mysql.jdbc.Driver"/>
<!--資料庫URL地址-->
<property name="url" value="https://www.cnblogs.com/hongyyds/p/jdbc:mysql://localhost:3306/mybatis_db?useSSl=true&useUnicode=true&characterEncoding=utf-8"/>
<!--mysql賬號-->
<property name="username" value="https://www.cnblogs.com/hongyyds/p/root"/>
<!--mysql密碼-->
<property name="password" value="https://www.cnblogs.com/hongyyds/p/root"/>
</dataSource>
</environment>
</environments>
<!--注意：每一個xml組態檔都需要在mybatis的核心組態檔中注冊才能生效-->
<mappers>
<mapper resource="cong/hong/mapper/UserMapper.xml"/>
</mappers>
</configuration>
八、撰寫測驗類進行測驗
8.1、測驗代碼：
package cong.hong.mapper;
import cong.hong.pojo.User;
import cong.hong.utils.MybatisUtils;
import org.apache.ibatis.session.SqlSession;
import org.junit.Test;
public class UserMapperTest {
@Test
public void test(){
SqlSession session = new MybatisUtils().getSqlSession();
UserMapper mapper = session.getMapper(UserMapper.class);
for (User user : mapper.getUserList()) {
System.out.println(user);
}
if(session!=null){
session.close();
}
}
}
8.2、運行結果
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標籤：Java