纯手写mybatis源码

entity：

package com.itmayiedu.entity;

public class User {

	private Integer id;
	private String userName;
	private Integer userAge;

	public String getUserName() {
		return userName;
	}

	public void setUserName(String userName) {
		this.userName = userName;
	}

	public Integer getUserAge() {
		return userAge;
	}

	public void setUserAge(Integer userAge) {
		this.userAge = userAge;
	}

	public Integer getId() {
		return id;
	}

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

}

mapper

package com.itmayiedu.mapper;

import java.util.List;

import com.itmayiedu.entity.User;
import com.itmayiedu.orm.annotation.ExtInsert;
import com.itmayiedu.orm.annotation.ExtParam;
import com.itmayiedu.orm.annotation.ExtSelect;

public interface UserMapper {

	@ExtInsert("insert into user(userName,userAge) values(#{userName},#{userAge})")
	public int insertUser(@ExtParam("userName") String userName, @ExtParam("userAge") Integer userAge);

	@ExtSelect("select * from User where userName=#{userName} and userAge=#{userAge} ")
	User selectUser(@ExtParam("userName") String name, @ExtParam("userAge") Integer userAge);

}

package com.itmayiedu.orm.annotation;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * 自定义插入注解 

 * 作者: 每特教育-余胜军

 * 联系方式:QQ644064779|WWW.itmayiedu.com

 */
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface ExtInsert {
	String value();
}

package com.itmayiedu.orm.annotation;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * 自定义参数注解

 * 作者: 每特教育-余胜军

 * 联系方式:QQ644064779|WWW.itmayiedu.com

 */
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.PARAMETER)
public @interface ExtParam {
	String value();
}

package com.itmayiedu.orm.annotation;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface ExtSelect {

	String value();

}

package com.itmayiedu.orm.mybatis.aop;

import java.lang.reflect.Field;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Parameter;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;

import com.itmayiedu.orm.annotation.ExtInsert;
import com.itmayiedu.orm.annotation.ExtParam;
import com.itmayiedu.orm.annotation.ExtSelect;
import com.itmayiedu.orm.utils.JDBCUtils;
import com.itmayiedu.utils.SQLUtils;

/**
 * 使用反射动态代理技术 拦截接口防范 作者: 每特教育-余胜军

 * 联系方式:QQ644064779|WWW.itmayiedu.com

 */
public class MyInvocationHandlerMbatis implements InvocationHandler {
	private Object object;

	public MyInvocationHandlerMbatis(Object object) {
		this.object = object;
	}

	// proxy 代理对象 method拦截方法 args方法上的参数值
	public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
		System.out.println("使用动态代理技术拦截接口方法开始");
		// 使用白话问翻译,@ExtInsert封装过程
		// 1. 判断方法上是否存在@ExtInsert
		ExtInsert extInsert = method.getDeclaredAnnotation(ExtInsert.class);
		if (extInsert != null) {
			return extInsert(extInsert, proxy, method, args);
		}
		// 2.查询的思路
		// 1. 判断方法上是否存 在注解
		ExtSelect extSelect = method.getDeclaredAnnotation(ExtSelect.class);
		if (extSelect != null) {
			// 2. 获取注解上查询的SQL语句
			String selectSQL = extSelect.value();
			// 3. 获取方法上的参数,绑定在一起
			ConcurrentHashMap paramsMap = paramsMap(proxy, method, args);
			// 4. 参数替换？传递方式
			List sqlSelectParameter = SQLUtils.sqlSelectParameter(selectSQL);
			// 5.传递参数
			List