eclipse中配置myBatis

eclipse string user sqlserver 数据库 encoding

首先去myBatis的官网下载jar包，地址：点击打开链接，该地址中还有个MyBatis-3-User-Guide-Simplified-Chinese.pdf的说明文档，建议一起下载。

下载完成后打开eclipse新建项目MyBatis，添加myBatis的jar包和mySQL的jar包，如果你使用的是其他数据库添加其他jar包。

新建User.java

 package com.myBatis.bean;

 import java.io.Serializable;
 import java.sql.Date;
 import java.util.Set;

 public class User implements Serializable{

     /**
      *
      */
     private static final long serialVersionUID = 1L;
     private String id;
     private String name;
     private String pasw;
     private String sex;
     private String email;
     private String degree;
     private String hobby;
     private Date birthDate;


     public String getDegree() {
         return degree;
     }
     public void setDegree(String degree) {
         this.degree = degree;
     }
     public void setHobby(String hobby) {
         this.hobby = hobby;
     }
     public String getSex() {
         return sex;
     }
     public void setSex(String sex) {
         this.sex = sex;
     }
     public String getEmail() {
         return email;
     }
     public void setEmail(String email) {
         this.email = email;
     }
     public String getHobby() {
         return hobby;
     }
     public Date getBirthDate() {
         return birthDate;
     }
     public void setBirthDate(Date birthDate) {
         this.birthDate = birthDate;
     }
     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 getPasw() {
         return pasw;
     }
     public void setPasw(String pasw) {
         this.pasw = pasw;
     }
 }

新建configuration.xml

 xml version="1.0" encoding="UTF-8" ?>

 "http://mybatis.org/dtd/mybatis-3-config.dtd">
 <configuration>

     <properties resource="properties/dataBase.properties">properties>
     <typeAliases>

         <typeAlias type="com.myBatis.bean.User" alias="User" />
     typeAliases>
     <environments default="development">
         <environment id="development">
             <transactionManager type="JDBC" />
             <dataSource type="POOLED">

                 <property name="driver" value="${driver}" />
                 <property name="url" value="${url}" />
                 <property name="username" value="${username}" />
                 <property name="password" value="${password}" />
             dataSource>
         environment>
     environments>

     <mappers>

         <mapper resource="conf/User.xml" />
     mappers>
 configuration>

新建dataBase.properties文件

在这个文件里，你可以配置oracle、sqlServer等等的配置信息，但是要通过名称区分开来，例如mysql.driver、orcl.driver等等，同时，如果跟换数据库时，configuration.xml中的${ }中的名字也要改变。

 driver = org.gjt.mm.mysql.Driver
 url = jdbc:mysql://localhost:3306/bbs
 username = root
 password = root

新建User.xml

 xml version="1.0" encoding="UTF-8" ?>

 PUBLIC "-//ibatis.apache.org//DTD Mapper 3.0//EN"
 "http://ibatis.apache.org/dtd/ibatis-3-mapper.dtd">
     <mapper namespace="User">
         <resultMap id="userResultMap" type="User">

             <id property="id" column="id" />
             <result property="name" column="name" />
             <result property="pasw" column="pasw" />
             <result property="email" column="email"/>
             <result property="birthDate" column="birthDate" />
             <result property="sex" column="sex" />
             <result property="degree" column="degree"/>
             <result property="hobby" column="hobby"/>

         resultMap>


         <select id="selectUser" resultType="User" resultMap="userResultMap">
             select * from user order by id;
         select>

     mapper>

新建UserDaoTest.java来测试

 package com.myBatis.dao;

 import java.io.Reader;
 import java.sql.SQLException;
 import java.util.ArrayList;
 import java.util.Iterator;
 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.myBatis.bean.User;

 public class UserDaoTest {

     public static List getAllUsers() throws SQLException {

         List users = new ArrayList();
         try {
             /*
              * 下面的内容在MyBatis-3-User-Guide-Simplified-Chinese.pdf中有详细的解释
              */
             String resource = "com/myBatis/data/configuration.xml";//加载配置文件
             Reader reader = Resources.getResourceAsReader(resource);
             SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder();
             SqlSessionFactory factory = builder.build(reader);
             SqlSession session = factory.openSession();
             users = session.selectList("User.selectUser");//配置文件中的namespace.select id
         } catch (Exception e) {
             e.printStackTrace();
         }
         return users;
     }

     public static void main(String[] args) {
         List users = new ArrayList();
         try {
             users = UserDaoTest.getAllUsers();
             Iterator iterator = users.iterator();
             while (iterator.hasNext()) {
                 User user = (User) iterator.next();
                 System.out.println(user.getName());
             }
         } catch (SQLException e) {
             e.printStackTrace();
         }
     }
 }

总结：

    一共3个配置文件，要注意xml文件中双引号是否是英文状态下输入的，如果对配置文件中的标签有不理解的话可以看pdf文档，相当详细还是中文的。