今天终于把它弄清楚了，刚刚学java，挺费劲呀。
在mysql中创建一个数据库mygps,表名为test(id,age,username,password)
(1)先引用mybatis-3.0.2.jar，mysql-connector-java-5.0.8-bin.jar
(2)配置连接数据库xml文件取名叫config.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> <environments default="development"> <environment id="development"> <transactionManager type="JDBC"/> <dataSource type="POOLED"> <property name="driver" value="com.mysql.jdbc.Driver"/> <property name="url" value="jdbc:mysql://localhost:3306/mygps"/>//数据库名为mypgs <property name="username" value="root"/> <property name="password" value="root"/> </dataSource> </environment> </environments> <mappers> <mapper resource="org/mybatis/test/testmapper.xml"/>//写sql语句的xml </mappers> </configuration>
（3）配置sql语句的xml取名叫testmapper.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="testmapper"> <select id="selectbyid" parameterType="int" resultType="org.mybatis.test.test">//test为一个类，用于设置与数据库有关的数据类型 select * from test where test.id=#{id} </select> <insert id="insertvalues" parameterType="org.mybatis.test.test"> insert into test (id,username,password,age) values (#{id},#{username},#{password},#{age}) </insert> <update id="updatevalue" parameterType="org.mybatis.test.test"> update test set username=#{username} where id=#{id} </update>
</mapper>
(4)取出数据库的连接取名叫util 是一个类
package org.mybatis.test;
import java.io.IOException; import java.io.Reader;
import org.apache.ibatis.io.Resources; import org.apache.ibatis.session.SqlSessionFactory; import org.apache.ibatis.session.SqlSessionFactoryBuilder; public class util {
public static SqlSessionFactory sqlmapper=null;
static { String rs="org/mybatis/test/config.xml";//为第二步中的配置文件名 Reader reader=null; try { reader=Resources.getResourceAsReader(rs);
} catch(IOException e) { e.printStackTrace(); } sqlmapper=new SqlSessionFactoryBuilder().build(reader); } public static SqlSessionFactory getSqlSessionFactory() { return sqlmapper; } } (5)执行sql语句取名叫getTest 是一个类
package org.mybatis.test; import org.mybatis.test.util; import org.mybatis.test.test; import org.apache.ibatis.session.SqlSession; public class getTest {
public test getvalue(int id) { SqlSession session= util.getSqlSessionFactory().openSession(); test ts=null; try { ts=(test)session.selectOne("testmapper.selectbyid",id);//为第三步中配置文件中的select id
} catch(Exception e) { e.printStackTrace(); } finally { session.close(); } return ts;
} public void insertvalue(int id, String username,String password,int age) { SqlSession session= util.getSqlSessionFactory().openSession(); test ts=new test(); ts.SetID(id); ts.SetUserName(username); ts.SetPassWord(password); ts.SetAge(age); try { session.selectOne("testmapper.insertvalues",ts);)//为第三步中配置文件中的insert id
} catch(Exception e) { e.printStackTrace(); } finally { session.close(); } } public void updatevalue(int id,String username) { SqlSession session= util.getSqlSessionFactory().openSession(); test ts=new test(); ts.SetID(id); ts.SetUserName(username); try { session.selectOne("testmapper.updatevalue",ts);)//为第三步中配置文件中的update id } catch(Exception e) { e.printStackTrace(); } finally { session.close(); } }
} (6)为数据源编写test类
package org.mybatis.test;
public class test { private int id; private int age; private String username; private String password;
public int getID() { return this.id; } public void SetID(int id) { this.id=id; }
public int getAge() { return this.age ; } public void SetAge(int age) { this.age=age; }
public String getUserName() { return this.username ; } public void SetUserName(String username) { this.username =username; }
public String getPassWord() { return this.password ; } public void SetPassWord(String password) { this.password =password; } }
