Posted 2021-04-16 SpringBoot

璇存槑

MyBatis鐗堟湰锛?.5.1

鐩稿叧鍘嗗彶鏂囩珷锛?/strong>闃呰鏈枃涔嬪墠锛屾偍鍙兘闇€瑕佸厛鐪嬩笅涔嬪墠鐨勭郴鍒?/strong>馃憞锛?/strong>

 

 

 

 

鍓嶈█

       杩愮甯峰箘涔嬩腑锛屽喅鑳滃崈閲屼箣澶栵紝鏄鍋氫釜浜嗙粨浜嗭紝鎶婁綘鐨勫浼欐帍鍑烘潵锛屼笂鍒哄垁銆?/span>

       涓婁竴绡囧凡缁忚兘澶熶娇鐢⊿qlSession杩涜鏌ヨ杩斿洖缁撴灉浜嗐€傝繖涓€绡囨垜浠氨鏄姞鍏ョ憺澹啗鍒€Mapper銆?/span>

 

涓€銆佸垎鏋?/span>

       鍦⊿qlSession浼氭彁渚沢etMapper鐨勬柟娉曪紝鍦―efaultSqlSession浼氫娇鐢≒roxy瀹炰緥鍖栦竴涓狹apperProxy浠ｇ悊锛岃€孧apperProxy浠ｇ悊浼氳幏鍙朣qlSession锛屽湪杩欓噷杩涜Sql鐨勬搷浣滐紝鐒跺悗缁撴灉銆?/span>

 

浜屻€佺紪鐮?/span>

2.1 MapperProxy

       MapperProxy鏄痬apper鏈€缁堟墽琛岀殑鏍稿績锛?/span>

package com.kfit.mybatis.session.impl;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.util.Collection;

import com.kfit.mybatis.session.SqlSession;

public class MapperProxy implements InvocationHandler{
    private SqlSession sqlSession;
    public MapperProxy(SqlSession sqlSession) {
        this.sqlSession = sqlSession;
    }

    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        String statement = method.getDeclaringClass().getName()+"."+method.getName();
        //isAssignableFrom鏂规硶鏄垽鏂槸鍚︿负鏌愪釜绫荤殑鐖剁被
        if(Collection.class.isAssignableFrom(method.getReturnType())) {
            //杩斿洖鍊兼槸闆嗗悎鐨勮瘽锛岄偅涔堟槸璋冪敤selectList
            return sqlSession.selectList(statement,null==args?null:args[0]);
        }else {
            return sqlSession.selectOne(statement,null==args?null:args[0]);
        }
    }

}

璇存槑锛?/span>

锛?锛夌敱浜嶮apperProxy鏄竴涓唬鐞嗙被锛屾墍浠ラ渶瑕佸疄鐜版帴鍙nvocationHandler鐨処nvoke鏂规硶銆?/span>

锛?锛夊湪Invoke鏂规硶涓洿鎺ヤ娇鐢⊿qlSession杩涜鎵ц锛岄偅涔堜富瑕佺殑鏍稿績灏辨槸瑕佸垽鏂叿浣撴墽琛屼粈涔堟柟娉曪紝杩欓噷鐜板湪閫氳繃杩斿洖鍊兼槸鍚︽槸闆嗗悎鏉ュ垽鏂槸鍚︽槸鎵цselectOne杩樻槸SelectList銆?/span>

 

2.2 SqlSession

       鍦⊿qlSession涓坊鍔爂etMapper鏂规硶锛?/span>

public interface SqlSession {
     <T> T selectOne(String statement, Object parameter);
     <E> List<E> selectList(String statement);
     <E> List<E> selectList(String statement, Object parameter);
     <T> T getMapper(Class<T> type);
}

       鍦―efaultSqlSession涓繘琛屽疄鐜癵etMapper鏂规硶锛?/span>

    @SuppressWarnings("unchecked")
    public <T> T getMapper(Class<T> type) {
        T newProxyInstance = (T) Proxy.newProxyInstance(type.getClassLoader(),new Class[]{type},new MapperProxy(this));
        return newProxyInstance;
    }

 

2.3 娴嬭瘯涓?/span>

       濂戒簡鍐欐浠ｇ爜娴嬭瘯涓嬪惂锛?/span>

public static void main(String[] args) {
        String resource = "mybatis-config.xml";
        InputStream inputStream = App.class.getClassLoader().getResourceAsStream(resource);
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        System.out.println(sqlSessionFactory);
        System.out.println(sqlSessionFactory.getConfiguration().getJdbcProperties().getUrl());

        SqlSession sqlSession = sqlSessionFactory.openSession();


        Demo demo = null;
        List<Demo> demos = null;


        //浣跨敤Mapper
        DemoMapper demoMapper = sqlSession.getMapper(DemoMapper.class);
        demo = demoMapper.getById(1);
        System.out.println(demo);
        demos = demoMapper.getAll();
        System.out.println(demos);
    }

杩愯鐪嬩笅缁撴灉锛?/span>

Demo [id=1,name=寮犱笁1]

[Demo [id=1, name=寮犱笁1], Demo [id=9, name=寮犱笁], Demo [id=10, name=寮犱笁], Demo [id=11, name=寮犱笁], Demo [id=12, name=寮犱笁], Demo [id=13, name=寮犱笁]]

       寰堟槑鏄炬墽琛岀殑缁撴灉鍜岀洿鎺ヤ娇鐢⊿qlSession璋冪敤鐨勭粨鏋滄槸涓€鏍风殑銆?/span>

        濂戒簡鏈夊叧鎵嬪啓MyBatis鐨勬枃绔犲氨鍏堝埌姝ゅ憡涓€娈佃惤浜嗭紝閫氳繃鎵嬪啓mybatis锛屾兂蹇呭ぇ瀹跺浜嶮yBatis鐨勮鐭ュ張楂樹簡涓€涓瓑绾т簡銆?/span>

鎴戝氨鏄垜锛屾槸棰滆壊涓嶄竴鏍风殑鐑熺伀銆?br class="mq-177">鎴戝氨鏄垜锛屾槸涓庝紬涓嶅悓鐨勫皬鑻规灉銆?br class="mq-178">

脿鎮熺┖瀛﹂櫌锛?span class="mq-182">http://t.cn/Rg3fKJD

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