mybatis框架入门学习教程

<?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>
  <!--配置数据源,环境-->
  <!--可以配置多个环境,一个测试时候用的,一个上线时候用的-->
  <environments default="test">
    <!--测试环境-->
    <environment id="test">
      <!--配置事务 : JDBC事务/MANAGED交给容器的事务-->
      <transactionManager type="JDBC"></transactionManager>
      <!--数据源 : POOLED池化/UNPOOLED非池化/JNDI密码加密,安全性高-->
      <dataSource type="POOLED">
        <property name="driver" value="oracle.jdbc.OracleDriver"/>
        <property name="url" value="jdbc:oracle:thin:@localhost:1521:orcl"/>
        <property name="username" value="scott"/>
        <property name="password" value="luogg"/>
      </dataSource>
    </environment>
    <!--服务器环境-->
    <environment id="deploy">
      <transactionManager type="JDBC"></transactionManager>
      <dataSource type="POOLED">
        <property name="driver" value="oracle.jdbc.OracleDriver"/>
        <property name="url" value="jdbc:oracle:thin:@localhost:1521:orcl"/>
        <property name="username" value="scott"/>
        <property name="password" value="luogg"/>
      </dataSource>
    </environment>
  </environments>
  <mappers>
    <mapper resource="com/luogg/mapper/PersonMapper.xml"/>
  </mappers>
</configuration>

package test;
import com.luogg.domain.Person;
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 org.junit.Test;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
/**
 * Created by luogg on 2017/2/17.
 */
public class TestMybatis {
  @Test
  public void init() throws IOException {
    /**
     * 测试数据库的连接
     * 1.定义一个String类型的变量resource,指向刚才配置的连接数据库的xml文件
     * 2.创建一个输入流,来读取我们的数据库配置文件
     * 3.输入流创建工厂.
     * 4.有了工厂之后open工厂
     */
    String resource = "sqlMapConfig.xml";
    InputStream is = Resources.getResourceAsStream(resource);
    SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(is);
    SqlSession session = factory.openSession();
}

CREATE TABLE person(
   ID NUMBER(2),
   NAME VARCHAR2(20),
   sex NUMBER(2),
   age NUMBER(3)
)
-- 写入数据,点击下方锁子按钮,然后点击＋
SELECT * FROM person FOR UPDATE

package com.luogg.domain;
/**
 * Created by luogg on 2017/2/17.
 */
public class Person {
  private String name;
  private int sex;
  private int age;
  private int id;
  @Override
  public String toString() {
    return "Person{" +
        "name='" + name + '\'' +
        ", sex=" + sex +
        ", age=" + age +
        ", id=" + id +
        '}';
  }
  public int getId() {
    return id;
  }
  public void setId(int id) {
    this.id = id;
  }
  public String getName() {
    return name;
  }
  public void setName(String name) {
    this.name = name;
  }
  public int getSex() {
    return sex;
  }
  public void setSex(int sex) {
    this.sex = sex;
  }
  public int getAge() {
    return age;
  }
  public void setAge(int age) {
    this.age = age;
  }
}

<?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">
<!--配置命名空间,命名空间+ .id 是唯一的sql语句标示符-->
<mapper namespace="com.luogg.mapper.PersonMapper">
  <!--查询所有数据,参数有id,resultType结果集,parameterType参数-->
  <!--注意 : sql语句中如果有要填写集合的,比如查询所有数据,返回一个Person的结果集,那么resultType参数直接写 路径+集合的类型
    比如: 返回一个Person集合,那么就填写Person Bean所在的路径+Person-->
  <select id="find" resultType="com.luogg.domain.Person">
    SELECT * from person
  </select>
</mapper>

<?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>
  <!--配置数据源,环境-->
  <!--可以配置多个环境,一个测试时候用的,一个上线时候用的-->
  <environments default="test">
    <!--测试环境-->
    <environment id="test">
      <!--配置事务 : JDBC事务/MANAGED交给容器的事务-->
      <transactionManager type="JDBC"></transactionManager>
      <!--数据源 : POOLED池化/UNPOOLED非池化/JNDI密码加密,安全性高-->
      <dataSource type="POOLED">
        <property name="driver" value="oracle.jdbc.OracleDriver"/>
        <property name="url" value="jdbc:oracle:thin:@localhost:1521:orcl"/>
        <property name="username" value="scott"/>
        <property name="password" value="luogg"/>
      </dataSource>
    </environment>
    <!--服务器环境-->
    <environment id="deploy">
      <transactionManager type="JDBC"></transactionManager>
      <dataSource type="POOLED">
        <property name="driver" value="oracle.jdbc.OracleDriver"/>
        <property name="url" value="jdbc:oracle:thin:@localhost:1521:orcl"/>
        <property name="username" value="scott"/>
        <property name="password" value="luogg"/>
      </dataSource>
    </environment>
  </environments>
  <!--映射文件mapper-->
  <mappers>
    <mapper resource="com/luogg/mapper/PersonMapper.xml"/>
  </mappers>
</configuration>

package test;
import com.luogg.domain.Person;
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 org.junit.Test;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
/**
 * Created by luogg on 2017/2/17.
 */
public class TestMybatis {
  @Test
  public void init() throws IOException {
    /**
     * 测试数据库的连接
     * 1.定义一个String类型的变量resource,指向刚才配置的连接数据库的xml文件
     * 2.创建一个输入流,来读取我们的数据库配置文件
     * 3.输入流创建工厂.
     * 4.有了工厂之后open工厂
     * 5.通过session访问配置文件中的sql语句
     */
    String resource = "sqlMapConfig.xml";
    InputStream is = Resources.getResourceAsStream(resource);
    SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(is);
    SqlSession session = factory.openSession();
    //如何访问PersonMapper.xml中的sql语句呢? 命名空间+ .id
    List<Person> list = session.selectList("com.luogg.mapper.PersonMapper.find");
    System.out.println(list.size());
    for(Person p : list){
      System.out.println(p);
    }
  }
}