1.1 添加jar包

? ? mybatis-3.5.1.jar————mybatis所需jar
? ? mysql-connector-java-5.1.22-bin.jar————用來連接操作mysql數(shù)據(jù)庫的jar包

1.2 編寫配置文件

注意: 配置文件名稱和位置不限,但是通常稱為mybatis-config.xml,存入到src下

<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE configurationPUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration><!--配置環(huán)境--><environments default="development"><environment id="development"><transactionManager type="JDBC"/><dataSource type="POOLED"><property name="driver" value="驅(qū)動器入口類的全名稱"/><property name="url" value="url地址信息"/><property name="username" value="賬戶"/><property name="password" value="密碼"/></dataSource></environment></environments><!--添加映射文件--><mappers><mapper resource="包名1/包名2/.../文件名.xml"/></mappers> </configuration>

1.3 編寫映射文件

<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <!--在當(dāng)前XML中編寫針對User的CURD操作命令--> <mapper namespace="命名空間[類似包的作用]"><select/insert/update/delete id="業(yè)務(wù)標(biāo)記名" resultType="實(shí)體類全名" parameterType="占位符類型">SQL命令</select/insert/update/delete> </mapper>

備注: 映射文件用于實(shí)現(xiàn) 實(shí)體對象與數(shù)據(jù)表字段的映射關(guān)系

(通俗的說,就是對數(shù)據(jù)庫操作的SQL語句要按照規(guī)定的形式,寫在映射文件中,通過相關(guān)命名調(diào)用使用)

1.4?編寫啟動程序

//獲得MyBatis的配置文件: 數(shù)據(jù)庫信息,映射文件信息[SQL]InputStream is=Resources.getResourceAsStream("配置文件位置/配置文件名.xml");//參數(shù)為配置文件的位置: a/mybatis-config.xml//基于配置信息創(chuàng)建SqlSessionFactorySqlSessionFactory factory=new SqlSessionFactoryBuilder().build(is);//獲得SqlSession: 連接數(shù)據(jù)庫SqlSession session=factory.openSession();//數(shù)據(jù)庫操作: CURD//執(zhí)行數(shù)據(jù)庫操作后,可以用其返回的數(shù)據(jù)類型接收結(jié)果類型 對象名 = session.CURD方法名("命名空間.業(yè)務(wù)標(biāo)識名");//映射文件中的命名空間和業(yè)務(wù)標(biāo)識名//執(zhí)行映射文件中的哪個SQL//提交事務(wù)session.commit();//關(guān)閉連接session.close();//關(guān)閉流is.close();

備注:CURD指的是數(shù)據(jù)庫里的:創(chuàng)建（Create）,更新（Update）,讀取（Retrieve）,刪除（Delete） ????操作

1.5 實(shí)例

1.5.1?mybatis-config.xml 配置文件

<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE configurationPUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration><!--配置環(huán)境--><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/mydb"/><property name="username" value="root"/><property name="password" value="123456"/></dataSource></environment></environments><!--添加映射文件--><mappers><mapper resource="bean/UserMapper.xml"/></mappers> </configuration>

1.5.2?UserMapper.xml 對user表操作的映射文件

<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <!--在當(dāng)前XML中編寫針對User的CURD操作命令--> <mapper namespace="my.mybatis"><select id="listUser" resultType="bean.User">select * from user</select><insert id="addUser" parameterType="bean.User" >insert into user(name,sex,age,address) values(#{name},#{sex},#{age},#{address})</insert> </mapper>

1.5.3 user實(shí)體類

package bean;public class User {private int id;private String name;private char sex;private int age;private String address;public User() {}public User(int id, String name, char sex, int age, String address) {this.id = id;this.name = name;this.sex = sex;this.age = age;this.address = address;}@Overridepublic String toString() {return "\nUser{" +"id=" + id +", name='" + name + '\'' +", sex=" + sex +", age=" + age +", address='" + address + '\'' +'}';}public int getId() {return id;}public void setId(int id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public char getSex() {return sex;}public void setSex(char sex) {this.sex = sex;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}public String getAddress() {return address;}public void setAddress(String address) {this.address = address;} }

1.5.4 main方法測試

package test;import bean.User; 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 java.io.IOException; import java.io.InputStream; import java.util.List;public class TestMyBatis {public static void main(String[] args) throws IOException {//獲得MyBatis的配置文件: 數(shù)據(jù)庫信息,映射文件信息[SQL]InputStream is=Resources.getResourceAsStream("mybatis-config.xml");//參數(shù)為配置文件的位置: a/mybatis-config.xml//基于配置信息創(chuàng)建SqlSessionFactorySqlSessionFactory factory=new SqlSessionFactoryBuilder().build(is);//獲得SqlSession: 連接數(shù)據(jù)庫SqlSession session=factory.openSession();//數(shù)據(jù)庫操作: CURDList<User> list=session.selectList("my.mybatis.listUser");System.out.println(list);//提交事務(wù)session.commit();//關(guān)閉連接session.close();} }

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