Mybatis-使用注解
作者：互联网
创建数据库的一张表 表名为User
我们新建一个普通的maven项目
1 <?xml version="1.0" encoding="UTF-8"?> 2 <project xmlns="http://maven.apache.org/POM/4.0.0" 3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 4 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> 5 <modelVersion>4.0.0</modelVersion> 6 7 <groupId>org.west</groupId> 8 <artifactId>MybatisLove</artifactId> 9 <version>1.0-SNAPSHOT</version> 10 11 <dependencies> 12 <!--单元测试--> 13 <dependency> 14 <groupId>junit</groupId> 15 <artifactId>junit</artifactId> 16 <version>4.11</version> 17 </dependency> 18 19 <!--mybatis的包--> 20 <dependency> 21 <groupId>org.mybatis</groupId> 22 <artifactId>mybatis</artifactId> 23 <version>3.5.1</version> 24 </dependency> 25 26 <!--连接数据库的驱动包--> 27 <dependency> 28 <groupId>mysql</groupId> 29 <artifactId>mysql-connector-java</artifactId> 30 <version>5.1.47</version> 31 </dependency> 32 33 <!--LOG4J日志包--> 34 <dependency> 35 <groupId>log4j</groupId> 36 <artifactId>log4j</artifactId> 37 <version>1.2.17</version> 38 </dependency> 39 40 </dependencies> 41 42 <build> 43 <!--希望maven在导出项目的时,能够将我们的配置及资源导出--> 44 <resources> 45 <resource> 46 <directory>src/main/java</directory> 47 <includes> 48 <include>**/*.properties</include> 49 <include>**/*.xml</include> 50 </includes> 51 <filtering>false</filtering> 52 </resource> 53 <resource> 54 <directory>src/main/resources</directory> 55 <includes> 56 <include>**/*.properties</include> 57 <include>**/*.xml</include> 58 </includes> 59 <filtering>false</filtering> 60 </resource> 61 </resources> 62 </build> 63 64 65 </project>
然后在建一个实体类pojo
1 package org.west.pojo;
2
3 public class User {
4 private int id;
5 private String name;
6 private String pwd;
7
8 public User() {
9 }
10
11 public int getId() {
12 return id;
13 }
14
15 public void setId(int id) {
16 this.id = id;
17 }
18
19 public String getName() {
20 return name;
21 }
22
23 public void setName(String name) {
24 this.name = name;
25 }
26
27 public String getPwd() {
28 return pwd;
29 }
30
31 public void setPwd(String pwd) {
32 this.pwd = pwd;
33 }
34
35 @Override
36 public String toString() {
37 return "User{" +
38 "id=" + id +
39 ", name='" + name + '\'' +
40 ", pwd='" + pwd + '\'' +
41 '}';
42 }
43 }
编写一个工具类
1 package org.west.utils;
2
3 import org.apache.ibatis.io.Resources;
4 import org.apache.ibatis.session.SqlSession;
5 import org.apache.ibatis.session.SqlSessionFactory;
6 import org.apache.ibatis.session.SqlSessionFactoryBuilder;
7
8 import java.io.IOException;
9 import java.io.InputStream;
10
11 public class MybatisUtils {
12 public static SqlSessionFactory sqlSessionFactory;
13
14 static {
15
16 try {
17 String resource="mybatis-config.xml";
18 InputStream inputStream = Resources.getResourceAsStream(resource);
19 sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
20 } catch (IOException e) {
21 e.printStackTrace();
22 }
23 }
24 public static SqlSessionFactory getSqlSessionFactory(){
25
26 return sqlSessionFactory;
27 }
28 public static SqlSession getSqlSession(){
29
30 return sqlSessionFactory.openSession(true);
31
32 }
33
34 }
编写核心配置文件xml
1 <?xml version="1.0" encoding="UTF-8" ?>
2 <!DOCTYPE configuration
3 PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
4 "http://mybatis.org/dtd/mybatis-3-config.dtd">
5 <configuration>
6 <!--数据配置文件-->
7 <properties resource="db.properties"/>
8
9 <!--日志-->
10 <settings>
11 <setting name="logImpl" value="LOG4J"/>
12 </settings>
13
14 <!--别名优化-->
15 <typeAliases>
16 <package name="org.westos.pojo"/>
17 </typeAliases>
18
19
20 <environments default="development">
21 <environment id="development">
22 <transactionManager type="JDBC"/>
23 <dataSource type="POOLED">
24 <property name="driver" value="${driver}"/>
25 <property name="url" value="${url}"/>
26 <property name="username" value="${username}"/>
27 <property name="password" value="${password}"/>
28 </dataSource>
29 </environment>
30 </environments>
31 <mappers>
32 <mapper class="org.west.dao.UserDao"/>
33 </mappers>
34
35 </configuration>
编写接口 使用注解
package org.west.dao;
import org.apache.ibatis.annotations.Select;
import org.west.pojo.User;
import java.util.List;
public interface UserDao {
@Select("select *from user")
List<User> getUserList();
}
编写测试类
package org.west;
import org.apache.ibatis.session.SqlSession;
import org.junit.Test;
import org.west.dao.UserDao;
import org.west.pojo.User;
import org.west.utils.MybatisUtils;
import java.util.List;
public class TestDao {
@Test
public void test(){
SqlSession sqlSession = MybatisUtils.getSqlSession();
UserDao mapper = sqlSession.getMapper(UserDao.class);
List<User> userList = mapper.getUserList();
for (User user : userList) {
System.out.println(user);
}
}
}
项目整体目录
运行结果:
标签：String,import,使用,west,org,Mybatis,注解,public,name 来源： https://www.cnblogs.com/xiaoqiqistudy/p/11246868.html