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Mybatis 入門之MyBatis環(huán)境搭建(第一篇)

更新時(shí)間：2021年04月01日 15:38:46 作者：lijianhua

Mybatis的前身叫iBatis，本是apache的一個(gè)開源項(xiàng)目, 2010年這個(gè)項(xiàng)目由apache software foundation 遷移到了google code，并且改名為MyBatis。這篇文章主要介紹了Mybatis入門第一篇之MyBaits環(huán)境搭建，需要的朋友參考下

Mybatis簡介

MyBatis的前身叫iBatis，本是apache的一個(gè)開源項(xiàng)目, 2010年這個(gè)項(xiàng)目由apache software foundation 遷移到了google code，并且改名為MyBatis。

MyBatis是支持普通SQL查詢，存儲(chǔ)過程和高級(jí)映射的優(yōu)秀持久層框架。MyBatis消除了幾乎所有的JDBC代碼和參數(shù)的手工設(shè)置以及結(jié)果集的檢索。MyBatis使用簡單的XML或注解用于配置和原始映射，將接口和Java的POJOs（Plan Old Java Objects，普通的Java對(duì)象）映射成數(shù)據(jù)庫中的記錄。

下面分步驟給搭建介紹mybatis 環(huán)境搭建。

1)在工程下引入mybatis-3.4.1.jar包，再引入數(shù)據(jù)庫（mysql,mssql..）包.

2)在src下新建一個(gè)配置文件conf.xml

<?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>
<!-- 引入外部配置文件 -->
 <properties resource="jdbc.properties" />
 <!-- 配置mybatis運(yùn)行環(huán)境 -->
 <environments default="development">
 <environment id="development">
 <!-- type="JDBC" 代表使用JDBC的提交和回滾來管理事務(wù) -->
 <transactionManager type="JDBC" /> 
 <!-- mybatis提供了3種數(shù)據(jù)源類型，分別是：POOLED,UNPOOLED,JNDI -->
 <!-- POOLED 表示支持JDBC數(shù)據(jù)源連接池 -->
 <!-- UNPOOLED 表示不支持?jǐn)?shù)據(jù)源連接池 -->
 <!-- JNDI 表示支持外部數(shù)據(jù)源連接池 -->
 <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="userMapper.xml"/>
 </mappers> 
</configuration>

這里是通過外部配置文件來存儲(chǔ)數(shù)據(jù)庫存信息的，所以加入一個(gè)jdbc.properties的數(shù)據(jù)庫存信息

driver=com.microsoft.sqlserver.jdbc.SQLServerDriver
url=jdbc:sqlserver://127.0.0.1;databaseName=test
username=sa
password=123456

3)建立一個(gè)映射文件 userMapper.xml

<?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="hw.com.ser.IUser">
 <!-- 查詢?nèi)坑脩?-->
 <select id="queryUsers" resultType="hw.com.pojo.User">
 select * from MS_User
 </select>
 <selectid="queryUserById" resultType="hw.com.pojo.User" parameterType="int">
 Select * From Ms_User Where id=#{id}
 </select> 
</mapper>

(這里要注意的是，namespace屬性，因?yàn)?，此?shí)例是通過接口映射的方式，所以，namespace屬性一點(diǎn)要寫成接口的路徑)附圖：

4)建一個(gè)映射接口類

package hw.com.ser;
import java.util.List;
import hw.com.pojo.User;
public interface IUser {
 public List<User> queryUsers();
 public User queryUserById(int id);
}

5）建立一個(gè)SqlSessionFactory

package hw.com.util;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.util.Properties;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
public class SqlSessionFactoryUtil {
 private static SqlSessionFactory sqlSessionFactory = null;
 private static final Class CLASS_LOCK = SqlSessionFactoryUtil.class;
 private SqlSessionFactoryUtil() {
 }
 public static SqlSessionFactory initSqlSessionFactory() {
 String resource = "conf.xml";
 InputStream inputStream = null;
 try {
 inputStream = Resources.getResourceAsStream(resource); 
 } catch (IOException e) {
 e.printStackTrace();
 }
 synchronized (CLASS_LOCK) {
 if (sqlSessionFactory == null) {
 sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
 }
 }
 return sqlSessionFactory;
 }
 public static SqlSession openSqlSession(){
 if(sqlSessionFactory==null){
 initSqlSessionFactory();
 }
 return sqlSessionFactory.openSession();
 }
}

6)建一個(gè)pojo

package hw.com.pojo;
import java.util.Date;
public class User {
 private String Id;
 private String UserName;
 private String UserPwd;
 private int DeptmentId;
 private String UserTrueName;
 private String Email;
 private int LearnCenterId;
 private Date CreateDate;
 private Date LastModifyDate;
 private int UserStatus;
 public User() {
 super();
 // TODO Auto-generated constructor stub
 }
 public String getId() {
 return Id;
 }
 public void setId(String id) {
 Id = id;
 }
 public String getUserName() {
 return UserName;
 }
 public void setUserName(String userName) {
 UserName = userName;
 }
 public String getUserPwd() {
 return UserPwd;
 }
 public void setUserPwd(String userPwd) {
 UserPwd = userPwd;
 }
 public int getDeptmentId() {
 return DeptmentId;
 }
 public void setDeptmentId(int deptmentId) {
 DeptmentId = deptmentId;
 }
 public String getUserTrueName() {
 return UserTrueName;
 }
 public void setUserTrueName(String userTrueName) {
 UserTrueName = userTrueName;
 }
 public String getEmail() {
 return Email;
 }
 public void setEmail(String email) {
 Email = email;
 }
 public int getLearnCenterId() {
 return LearnCenterId;
 }
 public void setLearnCenterId(int learnCenterId) {
 LearnCenterId = learnCenterId;
 }
 public Date getCreateDate() {
 return CreateDate;
 }
 public void setCreateDate(Date createDate) {
 CreateDate = createDate;
 }
 public Date getLastModifyDate() {
 return LastModifyDate;
 }
 public void setLastModifyDate(Date lastModifyDate) {
 LastModifyDate = lastModifyDate;
 }
 public int getUserStatus() {
 return UserStatus;
 }
 public void setUserStatus(int userStatus) {
 UserStatus = userStatus;
 }
 @Override
 public String toString() {
 return "User [Id=" + Id + ", UserName=" + UserName + ", UserPwd=" + UserPwd + ", DeptmentId=" + DeptmentId
 + ", UserTrueName=" + UserTrueName + ", Email=" + Email + ", LearnCenterId=" + LearnCenterId
 + ", CreateDate=" + CreateDate + ", LastModifyDate=" + LastModifyDate + ", UserStatus=" + UserStatus
 + "]";
 }
}

7) 在main方法下做測(cè)試

package hw.com.Day1.main;
import java.util.List;
import org.apache.ibatis.session.SqlSession;
import hw.com.pojo.User;
import hw.com.ser.IUser;
import hw.com.util.SqlSessionFactoryUtil;
public class UserTest {
 public static void main(String[] args) { 
 SqlSession sqlSession=null;
 try {
 sqlSession=SqlSessionFactoryUtil.openSqlSession();
 IUser iUser=sqlSession.getMapper(IUser.class);
 List<User> users=iUser.queryUsers();
 if(users.size()>0){
 for (User user : users) {
  System.out.println(user.toString());
 }
 }
 } catch (Exception e) {
 e.printStackTrace();
 }
 }
}

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