項目檔案位置(暫時這樣放實際開發不是這樣的)
Configuration.xml 檔案mybatis配置
<?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>
<typeAliases>
<typeAlias alias="User" type="bean.User"/>
</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://127.0.0.1:3306/test1"/>
<property name="username" value="root"/>
<property name="password" value=""/>
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource="model/User.xml"/>
</mappers>
</configuration>
pom.xml檔案相關依賴
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.7</maven.compiler.source>
<maven.compiler.target>1.7</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.47</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.1</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>4.2.5.RELEASE</version>
</dependency>
</dependencies>
User.xml檔案 寫sql的檔案
<?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="mapper.UserMapper">
<select id="selectUserById" parameterType="int" resultType="User">
select * from user where id=#{id}
</select>
</mapper>
User實體類檔案
package bean;
public class User {
private int id;
private String userName;
private String userAge;
private String userAddress;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getUserAge() {
return userAge;
}
public void setUserAge(String userAge) {
this.userAge = userAge;
}
public String getUserAddress() {
return userAddress;
}
public void setUserAddress(String userAddress) {
this.userAddress = userAddress;
}
@Override
public String toString() {
return "User [id=" + id + ", userName=" + userName + ", userAge="
+ userAge + ", userAddress=" + userAddress + "]";
}
}
test.java測試類
package controller;
import java.io.Reader;
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 bean.User;
public class Test {
private static SqlSessionFactory sqlSessionFactory;
private static Reader reader;
static{
try {
reader = Resources.getResourceAsReader("Configuration.xml");
sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
} catch (Exception e) {
e.printStackTrace();
}
}
public static SqlSessionFactory getSession(){
return sqlSessionFactory;
}
public static void main(String[] args) {
SqlSession session = sqlSessionFactory.openSession();
try {
User user = session.selectOne("mapper.UserMapper.selectUserById", 1);//沒有使用接口程式設計
System.out.println(user.getUserAge());
System.out.println(user.getUserAddress());
System.out.println(user.getUserName());
} finally {
session.close();
}
}
}
注意如果使用的是接口變成方式,那就要把User.xml中的命名空間改為接口的路徑.