1.1.1. 第一步：導入包
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1.1.2. 第二步：創建一個總配置文件mybatis-config.xml
| <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "mybatis-3-config.dtd" > <!-- XMLConfigBuilder是總配置文件的構建類 --> <configuration> <!-- 用於配置數據庫的連接參數 ,environments這個標簽可以配置多個數據庫的連接,default表示默認使用的配置--> <environments default="default-msql">
<!-- 數據庫的連接參數 Configuration查看參數--> <!-- 所有框架的靜態屬性都可以在這個框架的類里面找到,不用死記硬背 --> <!-- id:就是一個標識符 --> <environment id="default-msql"> <!-- 事務類型 --> <!-- 事務類型有哪些 JDBC:使用JDBC事務 MANAGED:不用事務 --> <transactionManager type="JDBC"></transactionManager> <!-- 數據源 --> <!-- type表示數據庫的類型 JNDI:使用JNDI獲得數據源. POOLED:使用默認的連接池獲得數據源 UNPOOLED:不用數據源
--> <!-- org.apache.ibatis.datasource.pooled.PooledDataSource --> <dataSource type="POOLED"> <!-- 所有的property對應的是一個set方法 --> <!-- 四要素 --> <property name="driver" value="org.gjt.mm.mysql.Driver"/> <property name="url" value="jdbc:mysql://localhost:3306/school"/> <property name="username" value="root"/> <property name="password" value="123456"/> </dataSource> </environment> </environments> <!-- 加載映射文件 --> <mappers> <!-- class屬性:加載的是使用注解調用方式的接口 --> <mapper class="cn.gzsxt.mapper.StudentMapper"/> </mappers>
</configuration>
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1.1.3. 第三步：創建一個DbUtils,獲得SqlSession操作對象
| package cn.lxm.utils;
import java.io.IOException; import java.io.InputStream;
import org.apache.ibatis.io.Resources; import org.apache.ibatis.session.SqlSession; import org.apache.ibatis.session.SqlSessionFactory; import org.apache.ibatis.session.SqlSessionFactoryBuilder;
/** * 這個一個數據庫連接幫助類,用於獲得操作數據庫的SqlSession對象 * @author Administrator * */ public class DbUtils {
//1.獲得SqlSessionFactory
public static SqlSessionFactory createSqlSessionFactory(){ //1.通過Resources讀取配置文件 try { //獲得一個總配置文件的輸入流 InputStream inputStream = Resources.getResourceAsStream("mybatis-config.xml"); //2.創建一個SqlSessionFactoryBuilder SqlSessionFactoryBuilder builder=new SqlSessionFactoryBuilder(); //獲得會話工廠 SqlSessionFactory sqlSessionFactory = builder.build(inputStream); return sqlSessionFactory; } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); }
return null; }
//2.獲得SqlSession public static SqlSession getSession(){
SqlSessionFactory sqlSessionFactory = DbUtils.createSqlSessionFactory(); return sqlSessionFactory.openSession(); }
public static void main(String[] args) { System.out.println(DbUtils.getSession()); }
}
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1.1.4. 第四步：創建一個映射接口+操作的注解
| package cn.lxm.mapper;
import java.util.List;
import org.apache.ibatis.annotations.Delete; import org.apache.ibatis.annotations.Insert; import org.apache.ibatis.annotations.Select; import org.apache.ibatis.annotations.Update;
import cn.lxm.entity.Student;
public interface StudentMapper {
/** * 插入記錄 * @param entity * @return */ @Insert(value="INSERT INTO student(AID, SNAME, SEX, BIRTHDAY, AGE) VALUES (#{sid}, #{sname}, #{sex}, #{birthday}, #{age})") int insert(Student entity);
/** * 刪除記錄 * @param sid * @return */ @Delete(value="DELETE FROM student WHERE SID=#{sid}") int deleteById(int sid);
/** * 更新記錄 * @param entity * @return */ @Update(value="UPDATE student SET AID=#{aid},SNAME=#{sname},SEX=#{sex},BIRTHDAY=#{birthday},AGE=#{age} WHERE SID=#{sid}") int update(Student entity); /** * 查詢所有的記錄 * @return */ @Select(value="SELECT * FROM student") List<Student> findAll();
}
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1.創建一個實體類
| package cn.lxm.entity;
import java.util.Date;
//ctrl+shift+y 大寫轉小寫 public class Student {
private Integer sid;//int(11) not null auto_increment comment '編號', private Integer aid;//int(11) null default '0', private String sname;//varchar(50) null default null comment '姓名', private String sex;//char(3) null default null comment '性別', private Date birthday;//date null default null comment '生日', private Integer age;//int(11) null default null comment '年齡', public Integer getSid() { return sid; } public void setSid(Integer sid) { this.sid = sid; } public Integer getAid() { return aid; } public void setAid(Integer aid) { this.aid = aid; } public String getSname() { return sname; } public void setSname(String sname) { System.out.println("-輸出名字-"+sname); this.sname = sname; } public String getSex() { return sex; } public void setSex(String sex) { this.sex = sex; } public Date getBirthday() { return birthday; } public void setBirthday(Date birthday) { this.birthday = birthday; } public Integer getAge() { return age; } public void setAge(Integer age) { this.age = age; }
}
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1.1.5. 第五步：測試代碼
| package cn.lxm.test;
import static org.junit.Assert.*;
import java.util.Date; import java.util.List;
import org.apache.ibatis.session.SqlSession; import org.junit.Test;
import cn.lxm.entity.Student; import cn.lxm.mapper.StudentMapper; import cn.lxm.utils.DbUtils;
public class StudentMapperTest {
/* @Test public void insert() { try { //1.獲得操作對象 SqlSession session = DbUtils.getSession(); //2.使用session.獲得映射接口的代理對象,這個代理對象是mybatis通過StudentMapper.xml創建的 StudentMapper studentMapper = session.getMapper(StudentMapper.class); Student student = new Student(); student.setSname("王五"); student.setSex("男"); //調用接口操作數據庫 studentMapper.insert(student); //提交 session.commit(); session.close(); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); }
}*/
/* @Test public void deleteById(){ //1.獲得操作對象 SqlSession session = DbUtils.getSession(); //2.使用session.獲得映射接口的代理對象,這個代理對象是mybatis通過StudentMapper.xml創建的 StudentMapper studentMapper = session.getMapper(StudentMapper.class); int count=studentMapper.deleteById(1); System.out.println(count); session.commit(); session.close(); }*/
/* @Test public void update(){ //1.獲得操作對象 SqlSession session = DbUtils.getSession(); //2.使用session.獲得映射接口的代理對象,這個代理對象是mybatis通過StudentMapper.xml創建的 StudentMapper studentMapper = session.getMapper(StudentMapper.class); Student entity=new Student(); entity.setSname("趙六"); entity.setSex("男"); entity.setAge(20); entity.setBirthday(new Date()); entity.setSid(2);
//更新記錄 int count=studentMapper.update(entity); System.out.println(count); session.commit(); session.close(); }*/
@Test public void findAll(){ //1.獲得操作對象 SqlSession session = DbUtils.getSession(); //2.使用session.獲得映射接口的代理對象,這個代理對象是mybatis通過StudentMapper.xml創建的 StudentMapper studentMapper = session.getMapper(StudentMapper.class); List<Student> list = studentMapper.findAll(); for(Student s:list){ System.out.print("姓名:"+s.getSname()); System.out.print(",年齡:"+s.getAge()); System.out.println(",生日:"+s.getBirthday()); }
session.commit(); session.close(); } }
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