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使用mybatis数据库时，需要添加一下jar包：
asm-3.3.1.jar
cglib-2.2.2.jar
javassist-3.17.1-GA.jar
log4j-1.2.17.jar
mybatis-3.2.2.jar
slf4j-api-1.7.5.jar
slf4j-log4j12-1.7.5.jar
当然了，数据库驱动jar包不能忘记添加，mybatis jar包可以从官网上下载。
下面是mybatis的使用：
Dept.java
package com.entity; public class Dept implements java.io.Serializable { private Integer id; private String name; private String location; public Dept() { } // Property accessors public Integer getId() { return this.id; } public void setId(Integer id) { this.id = id; } public String getName() { return this.name; } public void setName(String name) { this.name = name; } public String getLocation() { return this.location; } public void setLocation(String location) { this.location = location; } }
Dao包中的接口DeptDao.java
package com.dao; import java.util.List; import com.entity.Dept; /** * 全新环境下的老代码 * @author * @date 2015年12月3日 下午4:27:36 */ public interface DeptDao { public void insertDept(Dept dept); public void updateDept(Dept dept); public void deleteDept(int id); public List<Dept> selAll(); }
DeptDaoMapper.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="com.dao.DeptDao">
<resultMap id="deptResultMap" type="com.entity.Dept">
<id property="id" column="id" />
<result property="name" column="name" />
<result property="location" column="location" />
<result property="job" column="job" />
</resultMap>
<insert id="insertDept" parameterType="Dept">
insert into dept(id,name,location) values(seq_dept_id.nextval,#{name},#{location})
</insert>
<update id="updateDept" parameterType="Dept">
update dept set name=#{name},location=#{location} where id=#{id}
</update>
<delete id="deleteDept" parameterType="Dept">
delete dept where id=#{id}
</delete>
<select id="selectAll" resultType="Dept">
select * from dept
</select>
</mapper>
DeptDao接口的实现类DeptDaoImpl.java
package com.dao.impl; import java.io.IOException; import java.io.Reader; import java.util.ArrayList; 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.dao.DeptDao; import com.entity.Dept; public class DeptDaoImpl implements DeptDao { @Override //增加 public void insertDept(Dept dept) { //1.指定数据源 String resource="mybatis-config.xml"; //构建sqlsf对象 SqlSessionFactory factory=null; //sqlsession SqlSession session=null; //Reader对象 Reader reader=null; try { //获取reader对象 reader=Resources.getResourceAsReader(resource); //工厂生成器 SqlSessionFactoryBuilder builder=new SqlSessionFactoryBuilder(); //得到工厂 factory=builder.build(reader); //得到session session=factory.openSession(); session.insert("insertDept", dept); //增删改需提交事务 session.commit(); System.out.println("添加成功了"); } catch (Exception e) { e.printStackTrace(); }finally{ try { reader.close(); session.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } @Override //修改 public void updateDept(Dept dept) { //1.指定数据源 String resource="mybatis-config.xml"; //构建sqlsf对象 SqlSessionFactory factory=null; //sqlsession SqlSession session=null; //Reader对象 Reader reader=null; try { //获取reader对象 reader=Resources.getResourceAsReader(resource); //工厂生成器 SqlSessionFactoryBuilder builder=new SqlSessionFactoryBuilder(); //得到工厂 factory=builder.build(reader); //得到session session=factory.openSession(); session.update("updateDept", dept); //增删改需提交事务 session.commit(); System.out.println("修改成功了"); } catch (Exception e) { e.printStackTrace(); }finally{ try { reader.close(); session.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } @Override //删除 public void deleteDept(int id) { //1.指定数据源 String resource="mybatis-config.xml"; //构建sqlsf对象 SqlSessionFactory factory=null; //sqlsession SqlSession session=null; //Reader对象 Reader reader=null; try { //获取reader对象 reader=Resources.getResourceAsReader(resource); //工厂生成器 SqlSessionFactoryBuilder builder=new SqlSessionFactoryBuilder(); //得到工厂 factory=builder.build(reader); //得到session session=factory.openSession(); session.delete("deleteDept", id); //增删改需提交事务 session.commit(); System.out.println("删除成功了"); } catch (Exception e) { e.printStackTrace(); }finally{ try { reader.close(); session.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } @Override //查询所有 public List<Dept> selAll() { List<Dept> list=new ArrayList<Dept>(); //1.指定数据源 String resource="mybatis-config.xml"; //构建sqlsf对象 SqlSessionFactory factory=null; //sqlsession SqlSession session=null; //Reader对象 Reader reader=null; try { //获取reader对象 reader=Resources.getResourceAsReader(resource); //工厂生成器 SqlSessionFactoryBuilder builder=new SqlSessionFactoryBuilder(); //得到工厂 factory=builder.build(reader); //得到session session=factory.openSession(); list=session.selectList("selectAll"); } catch (Exception e) { e.printStackTrace(); }finally{ try { reader.close(); session.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } return list; } }
mybatis-config.xml,配置文件，放在src根目录下
<?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> <typeAliases> <typeAlias alias="Dept" type="com.entity.Dept"/> </typeAliases> <environments default="development"> <environment id="development"> <transactionManager type="JDBC"/> <dataSource type="UNPOOLED"> <property name="driver" value="oracle.jdbc.driver.OracleDriver"/> <property name="url" value="jdbc:oracle:thin:@192.168.40.128:1521:orcl"/> <property name="username" value="thunder"/> <property name="password" value="admin"/> </dataSource> </environment> </environments> <mappers> <mapper resource="com/dao/DeptDaoMapper.xml"/> </mappers> </configuration>
测试方法：
public static void main(String[] args) { DeptDao dd=new DeptDaoImpl(); Dept dept=new Dept(); //添加 // dept.setName("就业部"); // dept.setLocation("柒角旮旯"); // dd.insertDept(dept); //修改 // dept.setId(20); // dept.setName("城管部"); // dept.setLocation("你猜，你猜，猜对了我就告诉你"); // dd.updateDept(dept); //删除 // dd.deleteDept(20); //查询所有 List<Dept> list=dd.selAll(); for (Dept d : list) { System.out.println(d.getName()+"---------"+d.getLocation()); } }
以上就是简单的mybatis使用小例子，当然，项目中的使用会复杂很多，重点是DeptDaoMapper.xml文件中sql语句的设计，以及实现类中传值，其他的应该不是很难。
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原文地址：http://www.cnblogs.com/thrilling/p/5023660.html
