Mybatis 入门之MyBatis环境搭建(第一篇)

Mybatis的前身叫iBatis，本是apache的一个开源项目, 2010年这个项目由apache software foundation 迁移到了google code，并且改名为MyBatis。这篇文章主要介绍了Mybatis入门第一篇之MyBaits环境搭建，需要的朋友参考下

Mybatis简介

MyBatis的前身叫iBatis，本是apache的一个开源项目, 2010年这个项目由apache software foundation 迁移到了google code，并且改名为MyBatis。

MyBatis是支持普通SQL查询，存储过程和高级映射的优秀持久层框架。MyBatis消除了几乎所有的JDBC代码和参数的手工设置以及结果集的检索。MyBatis使用简单的XML或注解用于配置和原始映射，将接口和Java的POJOs（Plan Old Java Objects，普通的Java对象）映射成数据库中的记录。

下面分步骤给搭建介绍mybatis 环境搭建。

1)在工程下引入mybatis-3.4.1.jar包，再引入数据库（mysql,mssql..）包.

2)在src下新建一个配置文件conf.xml

这里是通过外部配置文件来存储数据库存信息的，所以加入一个jdbc.properties的数据库存信息

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

3)建立一个映射文件 userMapper.xml

    Select * From Ms_User Where id=#{id}

(这里要注意的是，namespace属性，因为，此实例是通过接口映射的方式，所以，namespace属性一点要写成接口的路径)附图：

4)建一个映射接口类

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

5）建立一个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)建一个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方法下做测试

 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 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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