MyBatis 实战

数据库

文件目录：

代码：User.xml(配置文件)

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://myb atis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="test"><select id="getUserById" parameterType="int" resultType="com.neuedu.model.User">select * from user where usersid = #{usersid}</select><select id="getAllUsers" resultType="com.neuedu.model.User">select * from user</select></mapper>

sqlMapConfig.xml（配置文件）

<?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>   <!-- 和spring整合后 environments配置将废除--><environments default="development"><environment id="development"><!-- 使用jdbc事务管理，事务控制由mybatis--><transactionManager type="JDBC" /><!-- 数据库连接池，由mybatis管理--><dataSource type="POOLED"><property name="driver" value="com.mysql.jdbc.Driver" /><property name="url" value="jdbc:mysql://localhost:3306/exam" /><property name="username" value="root" /><property name="password" value="439901" /></dataSource></environment></environments><!-- 加载 映射文件 --><mappers><mapper resource="sqlMap/User.xml"></mapper></mappers>
</configuration>

User.java

package com.neuedu.model;public class User {private int usersid;private String username;private String password;private int phone;private String email;public int getUserid() {return usersid;}public void setUserid(int userid) {this.usersid = userid;}public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}public int getPhone() {return phone;}public void setPhone(int phone) {this.phone = phone;}public String getEmail() {return email;}public void setEmail(String email) {this.email = email;}@Overridepublic String toString() {return "User [usersid=" + usersid + ", username=" + username + ", password=" + password + ", phone=" + phone+ ", email=" + email + "]";}}

UserTest.java

package com.neuedu.test;import java.io.IOException;
import java.io.InputStream;
import java.util.List;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 com.neuedu.model.User;
public class UserTest {public static void main(String[] args) throws IOException {InputStream inputStream = Resources.getResourceAsStream("sqlMapConfig.xml");SqlSessionFactory ssf = new SqlSessionFactoryBuilder().build(inputStream);SqlSession session = ssf.openSession();/*  User user =(User)session.selectOne("test.getUserById",1);System.out.println(user);*/List<User> users = session.selectList("test.getAllUsers");for(User user : users) {System.out.println(user);}}
}

jdbc.properties

jdbc.driver=oracle.jdbc.driver.OracleDriver
jdbc.url=jdbc:oracle:thin:@localhost:1521:orcl
jdbc.username=oaec
jdbc.password=oaec

log4j.properties

# Global logging configuration
#\u5728\u5f00\u53d1\u73af\u5883\u4e0b\u65e5\u5fd7\u7ea7\u522b\u8981\u8bbe\u7f6e\u6210DEBUG\uff0c\u751f\u4ea7\u73af\u5883\u8bbe\u7f6e\u6210info\u6216error
log4j.rootLogger=DEBUG, stdout
# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n

输出：

二、mybatis_Mapper代理方法

文件目录：

代码：User.xml(配置文件)

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://myb atis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.neuedu.mapper.UserMapper"><select id="getUserById" parameterType="int" resultType="com.neuedu.model.User">select * from user where usersid = #{usersid}</select><select id ="getAllUsers" resultType="com.neuedu.model.User">select * from user</select></mapper>

sqlMapConfig.xml（配置文件）

<?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><!-- 和spring整合后 environments配置将废除--><environments default="development"><environment id="development"><!-- 使用jdbc事务管理，事务控制由mybatis--><transactionManager type="JDBC" /><!-- 数据库连接池，由mybatis管理--><dataSource type="POOLED"><property name="driver" value="com.mysql.jdbc.Driver" /><property name="url" value="jdbc:mysql://localhost:3306/exam" /><property name="username" value="root" /><property name="password" value="439901" /></dataSource></environment></environments><!-- 加载 映射文件 --><mappers><mapper resource="sqlMap/User.xml"></mapper></mappers>
</configuration>

User.java

package com.neuedu.model;public class User {private int usersid;private String username;private String password;private int phone;private String email;public int getUserid() {return usersid;}public void setUserid(int userid) {this.usersid = userid;}public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}public int getPhone() {return phone;}public void setPhone(int phone) {this.phone = phone;}public String getEmail() {return email;}public void setEmail(String email) {this.email = email;}@Overridepublic String toString() {return "User [usersid=" + usersid + ", username=" + username + ", password=" + password + ", phone=" + phone+ ", email=" + email + "]";}}

UserMapper.java

package com.neuedu.mapper;import java.util.List;import com.neuedu.model.User;public interface UserMapper {public User getUserById(int usersid);public List<User> getAllUsers();
}

UserMapperTest.java

package com.neuedu.test;import java.io.IOException;
import java.io.InputStream;
import java.util.List;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 com.neuedu.mapper.UserMapper;
import com.neuedu.model.User;public class UserMapperTest {public static void main(String[] args) throws IOException {InputStream inputStream = Resources.getResourceAsStream("sqlMapConfig.xml");SqlSessionFactory ssf = new SqlSessionFactoryBuilder().build(inputStream);SqlSession session = ssf.openSession();UserMapper mapper = session.getMapper(UserMapper.class);/*User user = mapper.getUserById(1);System.out.println(user);*/List<User> users = mapper.getAllUsers();for(User user : users) {System.out.println(user);}}}

UserTest.java

package com.neuedu.test;import java.io.IOException;
import java.io.InputStream;
import java.util.List;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 com.neuedu.model.User;
public class UserTest {public static void main(String[] args) throws IOException {InputStream inputStream = Resources.getResourceAsStream("sqlMapConfig.xml");SqlSessionFactory ssf = new SqlSessionFactoryBuilder().build(inputStream);SqlSession session = ssf.openSession();/*  User user =(User)session.selectOne("test.getUserById",1);System.out.println(user);*/List<User> users = session.selectList("test.getAllUsers");for(User user : users) {System.out.println(user);}}
}

输出：