MyBatis(1)---------入门

MyBatis ç®ä»

MyBatis æ¬æ¯apacheçä¸ä¸ªå¼æºé¡¹ç®iBatis, 2010å¹´è¿ä¸ªé¡¹ç®ç±apache software foundation è¿ç§»å°äºgoogle codeï¼å¹¶ä¸æ¹åä¸ºMyBatisï¼æ¯ä¸ä¸ªåºäºJavaçæä¹å±æ¡æ¶ã

æä¹å±ï¼ å¯ä»¥å°ä¸å¡æ°æ®åå¨å°ç£çï¼å·å¤é¿æåå¨è½åï¼åªè¦ç£çä¸æåï¼å¨æçµæèå¶ä»æåµä¸ï¼éæ°å¼å¯ç³»ç»ä»ç¶å¯ä»¥è¯»åå°è¿äºæ°æ®ã
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ç¼ºç¹ï¼æ¢ï¼ç¸å¯¹äºååèè¨ï¼

ä¸ºä»ä¹ä½¿ç¨ MyBatis

å¹¶ä¸ MyBatis æ¯æä½¿ç¨ç®åç XML ææ³¨è§£æ¥éç½®åæ å°åçä¿¡æ¯ï¼å°æ¥å£å Java ç POJOs(Plain Old Java Objects,æ®éç Javaå¯¹è±¡)æ å°ææ°æ®åºä¸çè®°å½ã

æå»º MyBatis ç¯å¢ï¼https://github.com/mybatis/mybatis-3/releasesä¸ä¸è½½mybatis çjarå

ç¬¬ä¸ä¸ªMyBatisç¨åºï¼

1.åå»ºjavaé¡¹ç®ï¼

2.å¯¼å¥æ°æ®åºï¼

create database mybatisï¼

user mybatisï¼

CREATE TABLE student(
      id int(11) NOT NULL AUTO_INCREMENT   PRIMARY KEY ,
studentID int(11) NOT NULL UNIQUE,
        name varchar(255) NOT NULL
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
        Query OK, 0 rows affected (0.15 sec)

        INSERT INTO student VALUES(1,1,"ææ¯ä½ ç¸ç¸");
        INSERT INTO student VALUES(2,2,"ææ¯ä½ ç¸ç¸");
        INSERT INTO student VALUES(3,3,"ææ¯ä½ ç¸ç¸");

Â mybatis-3.5.2.jar

Â mysql-connector-java-8.0.18.jar

4.åå»ºå®ä½ç±»Studentï¼

package pojo;

/**
 * Studentå®ä½ç±»
 * @author lenovo
 */
public class Student {
    int id;
    int studentID;
    String name;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public int getStudentID() {
        return studentID;
    }

    public void setStudentID(int studentID) {
        this.studentID = studentID;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

5.éç½®mybatis-config.xmlæä»¶:æ å°æä»¶å°±æ¯åæçå®ä½ç±»Studentçxmlæä»¶

<?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>

    <!-- å«å -->
    <typeAliases>
        <package name="pojo"/>
    </typeAliases>
    <!-- æ°æ®åºç¯å¢ -->
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.cj.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/mybatis?characterEncoding=UTF-8"/>
                <property name="username" value="root"/>
                <property name="password" value="root"/>
            </dataSource>
        </environment>
    </environments>
    <!-- æ å°æä»¶ -->
    <mappers>
        <mapper resource="pojo/Student.xml"/>
    </mappers>

</configuration>

6.åå»ºStudent.xmlæä»¶

<?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="dao">
<!--    ç±äºå¨mybatis-config.xmlééç½®äº <typeAliases> å«åï¼æä»¥å¨è¿éç resultType å¯ä»¥ç´æ¥å Studentï¼èä¸ç¨åç±»çå¨éå®å pojo.Student-->
<!--    namespace å±æ§å¶å®å°±æ¯å¯¹ SQL è¿è¡åç±»ç®¡çï¼å®ç°ä¸åä¸å¡ç SQL éç¦»-->

    <select id="listStudent" resultType="Student">
        select * from  mybatis.student
    </select>

</mapper>

7.ç¼åæµè¯ç±»ï¼

package test;

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 pojo.Student;

import java.io.IOException;
import java.io.InputStream;
import java.util.List;
/**
 * @author lenovo
 */
public class MybatisTest{

    public static void main(String[] args) throws IOException {
        // æ ¹æ® mybatis-config.xml éç½®çä¿¡æ¯å¾å° sqlSessionFactory
        String resource = "mybatis-config.xml";
        InputStream inputStream = Resources.getResourceAsStream(resource);
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        // ç¶åæ ¹æ® sqlSessionFactory å¾å° session
        SqlSession session = sqlSessionFactory.openSession();
        // æåéè¿ session ç selectList() æ¹æ³è°ç¨ sql è¯å¥ listStudent
        List<Student> listStudent = session.selectList("listStudent");
        for (Student student : listStudent) {
            System.out.println("ID:" + student.getId()  + "NAME:" + student.getName());
        }

    }
}

8.è¿è¡æµè¯ç±»ï¼

ç»æï¼

ID:1NAME:ææ¯ä½ ç¸ç¸

ID:2NAME:ææ¯ä½ ç¸ç¸

ID:3NAME:ææ¯ä½ ç¸ç¸

è¿è¡åçï¼

åºæ¬åç

åºç¨ç¨åºæ¾ MyBatis è¦æ°æ®
MyBatis ä»æ°æ®åºä¸æ¾æ¥æ°æ®

1.éè¿ mybatis-config.xml å®ä½åªä¸ªæ°æ®åºï¼mybatisï¼

2.éè¿ Student.xml æ§è¡å¯¹åºç sql è¯å¥

3.åºäº Student.xml æè¿åçæ°æ®åºå°è£å¨ Student å¯¹è±¡ä¸

4.æå¤ä¸ª Student å¯¹è±¡è£è½½ä¸ä¸ª Student éåä¸
è¿åä¸ä¸ª Student éå

CRUNæä½

1.åå»ºå®ä½ç±»Studentï¼

package pojo;

/**
 * Studentå®ä½ç±»
 * @author lenovo
 */
public class Student {
    int id;
    int studentID;
    String name;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public int getStudentID() {
        return studentID;
    }

    public void setStudentID(int studentID) {
        this.studentID = studentID;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

2.éç½®mybatis-config.xmlæä»¶:æ å°æä»¶å°±æ¯åæçå®ä½ç±»Studentçxmlæä»¶

<?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>

    <!-- å«å -->
    <typeAliases>
        <package name="pojo"/>
    </typeAliases>
    <!-- æ°æ®åºç¯å¢ -->
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.cj.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/mybatis?characterEncoding=UTF-8"/>
                <property name="username" value="root"/>
                <property name="password" value="root"/>
            </dataSource>
        </environment>
    </environments>
    <!-- æ å°æä»¶ -->
    <mappers>
        <mapper resource="pojo/Student.xml"/>
    </mappers>

</configuration>

3.éç½®Student.xmlæ å°

<?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="pojo">
<!--    parameterTypeï¼è¦æ±è¾å¥åæ°çç±»å-->
<!--    resultTypeï¼è¾åºçç±»å-->
    <select id="listStudent" resultType="Student">
        select * from  mybatis.student
    </select>

    <insert id="addStudent" parameterType="Student">
        insert into  mybatis.student (id, studentID, name) values (#{id},#{studentID},#{name})
    </insert>

    <delete id="deleteStudent" parameterType="Student">
        delete from  mybatis.student where id = #{id}
    </delete>

    <select id="getStudent" parameterType="_int" resultType="Student">
        select * from  mybatis.student where id= #{id}
    </select>

    <update id="updateStudent" parameterType="Student">
        update  mybatis.student set name=#{name} where id=#{id}
    </update>
</mapper>

4.å®ç°å¢å æ¹æ¥

package test;

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 pojo.Student;

import java.io.IOException;
import java.io.InputStream;
import java.util.List;

public class MyBatisTest {

    public static void main(String[] args) throws IOException {
        // æ ¹æ® mybatis-config.xml éç½®çä¿¡æ¯å¾å° sqlSessionFactory
        String resource = "mybatis-config.xml";
        InputStream inputStream = Resources.getResourceAsStream(resource);
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        // ç¶åæ ¹æ® sqlSessionFactory å¾å° session
        SqlSession session = sqlSessionFactory.openSession();

        // å¢å å¦ç å äºä¸ä¸ª ID å studentID é½ä¸º 4ï¼ååä¸ºâæ°å¢å çå¦çâ çå¦ç
        Student student1 = new Student();
        student1.setId(4);
        student1.setStudentID(4);
        student1.setName("æ°å¢å çå¦ç");
        session.insert("addStudent", student1);

        // å é¤å¦ç  å é¤äº ID = 1 çå¦ç
        Student student2 = new Student();
        student2.setId(1);
        session.delete("deleteStudent", student2);

        // è·åå¦ç è·åäº ID = 2çå¦ç
        Student student3 = session.selectOne("getStudent", 2);

        // ä¿®æ¹å¦ç å° ID = 2 çå¦ççååä¿®æ¹ä¸º âä¿®æ¹çå¦çâ
        student3.setName("ä¿®æ¹çå¦ç");
        session.update("updateStudent", student3);

        // æåéè¿ session ç selectList() æ¹æ³è°ç¨ sql è¯å¥ listStudent
        List<Student> listStudent = session.selectList("listStudent");
        for (Student student : listStudent) {
            System.out.println("ID:" + student.getId() + ",NAME:" + student.getName());
        }

        // æäº¤ä¿®æ¹  æ¥æäº¤äºå¡ï¼ä¹å¯ä»¥ç®åçè§£ä¸ºæ´æ°å°æ°æ®åº
        session.commit();
        // å³é session
        session.close();
    }
}

5.è¿è¡æµè¯ç±»MyBatisTest

è¿è¡ç»æï¼

ID:2,NAME:ä¿®æ¹çå¦ç

ID:3,NAME:ææ¯ä½ ç¸ç¸

ID:4,NAME:æ°å¢å çå¦ç

æ¨¡ç³æ¥è¯¢ï¼

1.åå»ºå®ä½ç±»Studentï¼

package pojo;

/**
 * Studentå®ä½ç±»
 * @author lenovo
 */
public class Student {
    int id;
    int studentID;
    String name;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public int getStudentID() {
        return studentID;
    }

    public void setStudentID(int studentID) {
        this.studentID = studentID;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

2.éç½®mybatis-config.xmlæä»¶:æ å°æä»¶å°±æ¯åæçå®ä½ç±»Studentçxmlæä»¶

<?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>

    <!-- å«å -->
    <typeAliases>
        <package name="pojo"/>
    </typeAliases>
    <!-- æ°æ®åºç¯å¢ -->
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.cj.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/mybatis?characterEncoding=UTF-8"/>
                <property name="username" value="root"/>
                <property name="password" value="root"/>
            </dataSource>
        </environment>
    </environments>
    <!-- æ å°æä»¶ -->
    <mappers>
        <mapper resource="pojo/Student.xml"/>
    </mappers>

</configuration>

3.éç½®Student.xmlæ å°

<?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="pojo">
<!--    parameterTypeï¼è¦æ±è¾å¥åæ°çç±»å-->
<!--    resultTypeï¼è¾åºçç±»å-->

    <select id="findStudentByName" parameterType="String" resultType="Student">
        SELECT * FROM mybatis.student WHERE name LIKE '%${value}%'
    </select>


</mapper>

4.è¿è¡æµè¯ç±»

package test;

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 org.junit.Test;
import pojo.Student;

import java.io.IOException;
import java.io.InputStream;
import java.util.List;

/**
 * @author lenovo
 */
public class MyBatisTest {

    @Test
    public void test() throws IOException {

        // æ ¹æ® mybatis-config.xml éç½®çä¿¡æ¯å¾å° sqlSessionFactory
        String resource = "mybatis-config.xml";
        InputStream inputStream = Resources.getResourceAsStream(resource);
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        // ç¶åæ ¹æ® sqlSessionFactory å¾å° session
        SqlSession session = sqlSessionFactory.openSession();

        // æ¨¡ç³æ¥è¯¢
        List<Student> students = session.selectList("findStudentByName", "ç¸ç¸");
        for (Student student : students) {
            System.out.println("ID:" + student.getId() + ",NAME:" + student.getName());
        }
    }
}

5.è¿è¡æµè¯ç±»ï¼

ç»æï¼

ID:3,NAME:ææ¯ä½ ç¸ç¸

å¤æ¡ä»¶æ¥è¯¢

1.åå»ºå®ä½ç±»Studentï¼

package pojo;

/**
 * Studentå®ä½ç±»
 * @author lenovo
 */
public class Student {
    int id;
    int studentID;
    String name;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public int getStudentID() {
        return studentID;
    }

    public void setStudentID(int studentID) {
        this.studentID = studentID;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

2.éç½®mybatis-config.xmlæä»¶:æ å°æä»¶å°±æ¯åæçå®ä½ç±»Studentçxmlæä»¶

<?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>

    <!-- å«å -->
    <typeAliases>
        <package name="pojo"/>
    </typeAliases>
    <!-- æ°æ®åºç¯å¢ -->
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.cj.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/mybatis?characterEncoding=UTF-8"/>
                <property name="username" value="root"/>
                <property name="password" value="root"/>
            </dataSource>
        </environment>
    </environments>
    <!-- æ å°æä»¶ -->
    <mappers>
        <mapper resource="pojo/Student.xml"/>
    </mappers>

</configuration>

3.éç½®Student.xmlæ å°

<?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="pojo">
<!--    parameterTypeï¼è¦æ±è¾å¥åæ°çç±»å-->
<!--    resultTypeï¼è¾åºçç±»å-->

    <select id="listCategoryByIdAndName"  parameterType="map" resultType="Student">
        select * from   mybatis.student  where id> #{id}  and name like concat('%',#{name},'%')
    </select>
</mapper>

4.åå»ºæµè¯ç±»ï¼è¿å¥junit.jarå

package test;

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 org.junit.Test;
import pojo.Student;

import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * @author lenovo
 */
public class MyBatisTest {

    @Test
    public void test() throws IOException {

        // æ ¹æ® mybatis-config.xml éç½®çä¿¡æ¯å¾å° sqlSessionFactory
        String resource = "mybatis-config.xml";
        InputStream inputStream = Resources.getResourceAsStream(resource);
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        // ç¶åæ ¹æ® sqlSessionFactory å¾å° session
        SqlSession session = sqlSessionFactory.openSession();

//        å ä¸ºæ¯å¤ä¸ªåæ°ï¼èselectListæ¹æ³ååªæ¥åä¸ä¸ªåæ°å¯¹è±¡ï¼æä»¥éè¦æå¤ä¸ªåæ°æ¾å¨Mapéï¼ç¶åæè¿ä¸ªMapå¯¹è±¡ä½ä¸ºåæ°ä¼ éè¿å»
//        æ¥è¯¢id>1ä¸åååæâææ¯ä½ ç¸âçåå
        Map<String,Object> params = new HashMap<>();
        params.put("id", 1);
        params.put("name", "ææ¯ä½ ç¸");

        List<Student> cs = session.selectList("listCategoryByIdAndName",params);
        for (Student c : cs) {
            System.out.println(c.getName());
        }
    }
}

5.è¿è¡æµè¯ç±»ï¼

ç»æï¼

ææ¯ä½ ç¸ç¸

Â parameterTypeï¼ å°±æ¯ç¨æ¥å¨ SQL æ å°æä»¶ä¸æå®è¾å¥åæ°ç±»åçï¼å¯ä»¥æå®ä¸ºåºæ¬æ°æ®ç±»åï¼å¦ intãfloat çï¼ãåè£æ°æ®ç±»åï¼å¦ StringãInterger çï¼ä»¥åç¨æ·èªå·±ç¼åç JavaBean å°è£ç±»
Â resultTypeï¼ å¨å è½½ SQL éç½®ï¼å¹¶ç»å®æå®è¾å¥åæ°åè¿è¡ SQL ä¹åï¼ä¼å¾å°æ°æ®åºè¿åçååºç»æï¼æ¤æ¶ä½¿ç¨ resultType å°±æ¯ç¨æ¥æå®æ°æ®åºè¿åçä¿¡æ¯å¯¹åºç Java çæ°æ®ç±»åã
Â â#{}â ï¼ å¨ä¼ ç»ç JDBC çç¼ç¨ä¸ï¼å ä½ç¬¦ç¨ â?â æ¥è¡¨ç¤ºï¼ç¶ååå è½½ SQL ä¹åæç§ â?â çä½ç½®è®¾ç½®åæ°ãè â#{}â å¨ MyBatis ä¸ä¹ä»£è¡¨ä¸ç§å ä½ç¬¦ï¼è¯¥ç¬¦å·æ¥åè¾å¥åæ°ï¼å¨å¤§æ¬å·ä¸ç¼ååæ°åç§°æ¥æ¥åå¯¹åºåæ°ãå½ â#{}â æ¥åç®åç±»åæ¶å¯ä»¥ç¨ value æèå¶ä»ä»»æåç§°æ¥è·åã
Â â${}â ï¼ å¨ SQL éç½®ä¸ï¼ææ¶åéè¦æ¼æ¥ SQL è¯å¥ï¼ä¾å¦æ¨¡ç³æ¥è¯¢æ¶ï¼ï¼ç¨ â#{}â æ¯æ æ³è¾¾å°ç®ççãå¨ MyBatis ä¸ï¼â${}â ä»£è¡¨ä¸ä¸ª âæ¼æ¥ç¬¦å·â ï¼å¯ä»¥å¨åæ SQL è¯å¥ä¸æ¼æ¥æ°çç¬¦å SQL è¯æ³çè¯å¥ãä½¿ç¨ â${}â æ¼æ¥ç¬¦å·æ¼æ¥ SQL ï¼ä¼å¼èµ· SQL æ³¨å¥ï¼æä»¥ä¸è¬ä¸å»ºè®®ä½¿ç¨ â${}âã
MyBatis ä½¿ç¨åºæ¯ï¼ å¨è¿è¡ MyBatis å¼åæ¶ï¼å¤§é¨åç²¾åé½æ¾å¨äº SQL æ å°æä»¶ä¸ã MyBatis çç¹ç¹å°±æ¯ä»¥ SQL è¯å¥ä¸ºæ ¸å¿çä¸å®å¨ç ORMï¼å³ç³»åæ å°ï¼æ¡æ¶ãä¸ Hibernate ç¸æ¯ï¼Hibernate çå¦ä¹ ææ¬æ¯è¾é«ï¼è SQL è¯å¥å¹¶ä¸éè¦å¼åäººåå®æï¼åªéè¦è°ç¨ç¸å³ API å³å¯ãè¿å¯¹äºå¼åæçæ¯ä¸ä¸ªä¼å¿ï¼ä½æ¯ç¼ºç¹æ¯æ²¡åæ³å¯¹ SQL è¯å¥è¿è¡ä¼ååä¿®æ¹ãè MyBatis è½ç¶éè¦å¼åäººåèªå·±éç½® SQL è¯å¥ï¼MyBatis æ¥å®ç°æ å°å³ç³»ï¼ä½æ¯è¿æ ·çé¡¹ç®å¯ä»¥éåºç»å¸¸ååçé¡¹ç®éæ±ãæä»¥ä½¿ç¨ MyBatis çåºæ¯æ¯ï¼å¯¹ SQL ä¼åè¦æ±æ¯è¾é«ï¼ææ¯é¡¹ç®éæ±æä¸å¡ç»å¸¸åå¨ã

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MyBatis(1)---------入门

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