01.初識TK.Mybatis插件

Mybatis Tk插件環境搭建

一、概述

最近在一家公司實習，他們用的Mybatis框架，以前都是在XML文件寫SQL，同事們都使用TK插件，絕大部分sql都由TK幫我們集成好了，所以來學習哈。下面基於SpringBoot搭建環境的。

二、Maven依賴

		<dependency>
            <groupId>tk.mybatis</groupId>
            <artifactId>mapper-spring-boot-starter</artifactId>
            <version>1.1.3</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <!--類型處理，沒有此依賴，有可能報no found property異常-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-typehandlers-jsr310</artifactId>
            <version>1.0.1</version>
        </dependency>
        <!--單元測試-->
         <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

三、appliaction.yml配置

在這裏，我們需要配置datasource，還配置sql日誌，以便於我們觀察執行sql語句。

spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    username: your username
    password: your password
    url: jdbc:mysql://localhost/tk_test?characterEncoding=utf-8&useSSL=false
    jpa:
      show-sql: true
      
# 打印sql語句
mybatis:
  configuration:
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

四、創建數據表

創建一張Product表

CREATE TABLE `product` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `product_name` varchar(255) NOT NULL COMMENT '商品名稱',
  `price` decimal(10,0) NOT NULL COMMENT '商品價格',
  `in_time` datetime NOT NULL COMMENT '入庫時間',
  `out_time` datetime NOT NULL COMMENT '出庫時間',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB  DEFAULT CHARSET=utf8;

INSERT INTO product(product_name, price, in_time, out_time) VALUES('Redis深度歷險記', 79.00, '2019-12-21 18:22:20', '2019-12-23 18:22:20');
INSERT INTO product(product_name, price, in_time, out_time) VALUES('Java 8 函數編程', 56.00, '2019-12-24 18:22:20', '2019-12-26 18:22:20');
INSERT INTO product(product_name, price, in_time, out_time) VALUES('劍指offer', 67.00, '2019-12-27 18:22:20', '2019-12-29 18:22:20');

五、查詢

• 創建Java Bean

package com.example.test.tk.bean;

import lombok.Data;
import javax.persistence.*;
import java.math.BigDecimal;
import java.time.LocalDateTime;
@Data
@Table(name = "product")
public class Product {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    
    private String productName;
    
    private BigDecimal price;

    private LocalDateTime inTime;
    
    private LocalDateTime outTime;
}

• 創建ProductDAO

package com.example.test.tk.dao;

import com.example.test.tk.bean.Product;
import tk.mybatis.mapper.common.Mapper;

@org.apache.ibatis.annotations.Mapper
public interface ProductDao extends Mapper<Product> {
}

• 單元測試
  查詢所有記錄

package com.example.test.tk.dao;

import com.example.test.tk.bean.Product;
import org.junit.Assert;
import org.junit.jupiter.api.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import tk.mybatis.mapper.entity.Example;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.List;

@RunWith(SpringRunner.class)
@SpringBootTest
class ProductDaoTest {
    @Autowired
    private ProductDao productDao;

    @Test
    public void selectAll(){
        List<Product> productList = productDao.selectAll();
        Assert.assertEquals(3, productList.size());
    }
 }

控制檯打印日誌，如下

==>  Preparing: SELECT id,product_name,price,in_time,out_time FROM product 
==> Parameters: 
<==    Columns: id, product_name, price, in_time, out_time
<==        Row: 1, Redis深度歷險記, 79, 2019-12-21 18:22:20, 2019-12-23 18:22:20
<==        Row: 2, Java 8 函數編程, 56, 2019-12-24 18:22:20, 2019-12-26 18:22:20
<==        Row: 3, 劍指offer, 67, 2019-12-27 18:22:20, 2019-12-29 18:22:20
<==      Total: 3

六、最後

在下一章，將介紹TK其他查詢方法。感謝欣賞。