MyBatis(七)：mybatis Java API编程实现增、删、改、查的用法

最近工作中用到了mybatis的Java API方式进行开发，顺便也整理下该功能的用法，接下来会针对基本部分进行学习：

Mybatis官网给了具体的文档，但是并没有对以上用法具体介绍，因此在这里整理下，以便以后工作用到时，可以参考。

本章主要增、删、改、查的用法进行学习（本章将结合Spring自动注入《Spring（二十三）：Spring自动注入的实现方式》），下边文章分为以下几个步骤：

1）新建maven，并引入spring/mybatis/mybatis-spring/mysql/druid/junit包，新增配置spring-config.xml/mybaits-config.xml/jdbc.properties配置文件；

2）在mysql中新建mydb，并创建article,article_category两张表；

3）新增用法；

4）修改用法；

5）查询用法；

6）删除用法。

1）新建maven，并引入spring/mybatis/mybatis-spring/mysql/druid/junit包，新增配置spring-config.xml/mybaits-config.xml/jdbc.properties配置文件

新建一个maven项目(Learn-Spring-01，源码以上处至github：https://github.com/478632418/mybatis-spring-auto-annonation/tree/master/Learn-Spring-01)，项目pom.xml中引入以下包：

spring相关包：

        。。。。。
<org.springframework.version>5.2.0.RELEASE</org.springframework.version>
        <org.mybatis.version>3.4.6</org.mybatis.version>
        <com.alibaba.version>1.1.21</com.alibaba.version>
        <mysql.version>8.0.11</mysql.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${org.springframework.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>${org.springframework.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>${org.springframework.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${org.springframework.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>${org.springframework.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${org.springframework.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>${org.springframework.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>${org.springframework.version}</version>
        </dependency>
        <dependency>
            <groupId>aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.5.4</version>
        </dependency>
        <dependency>
            <groupId>aspectj</groupId>
            <artifactId>aspectjrt</artifactId>
            <version>1.5.4</version>
        </dependency>
        <!-- Sping Test相关依赖 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>${org.springframework.version}</version>
        </dependency>
。。。

mybatis、mybatis-spring包

        <!--MyBatis -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>${org.mybatis.version}</version>
        </dependency>
        <!-- Mybatis自身实现的Spring整合依赖 -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.3</version>
        </dependency>

mysql和druid包

        <!--MySql数据库驱动 -->
        <!-- https://mvnrepository.com/artifact/com.alibaba/druid -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>${com.alibaba.version}</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>${mysql.version}</version>
        </dependency>

junit包：

        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>

新建以下类：

实体类：

com.dx.test.model.Article.java

package com.dx.test.model;

import java.util.Date;

/**
 * 文章详情
 */
public class Article {
    private Long id; // 文章id
    private String title; // 文章标题
    private String content; // 文章内容
    private Integer categoryId; // 文章分类id

    private String createUser; // 新建用户
    private String createUserId;// 新建用户id
    private Date createTime; // 新建时间
    private String updateUser; // 修改用户
    private String updateUserId;// 修改用户id
    private Date updateTime; // 修改时间
    private Integer version; // 乐观锁版本号

    private ArticleCategory articleCategory; // [扩展字段]文章分类实体

    public Long getId() {
        return id;
    }

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

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }
    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    }

    public Integer getCategoryId() {
        return categoryId;
    }

    public void setCategoryId(Integer categoryId) {
        this.categoryId = categoryId;
    }

    public String getCreateUser() {
        return createUser;
    }

    public void setCreateUser(String createUser) {
        this.createUser = createUser;
    }

    public String getCreateUserId() {
        return createUserId;
    }

    public void setCreateUserId(String createUserId) {
        this.createUserId = createUserId;
    }

    public Date getCreateTime() {
        return createTime;
    }

    public void setCreateTime(Date createTime) {
        this.createTime = createTime;
    }

    public String getUpdateUser() {
        return updateUser;
    }

    public void setUpdateUser(String updateUser) {
        this.updateUser = updateUser;
    }

    public String getUpdateUserId() {
        return updateUserId;
    }

    public void setUpdateUserId(String updateUserId) {
        this.updateUserId = updateUserId;
    }

    public Date getUpdateTime() {
        return updateTime;
    }

    public void setUpdateTime(Date updateTime) {
        this.updateTime = updateTime;
    }

    public Integer getVersion() {
        return version;
    }

    public void setVersion(Integer version) {
        this.version = version;
    }

    public ArticleCategory getArticleCategory() {
        return articleCategory;
    }

    public void setArticleCategory(ArticleCategory articleCategory) {
        this.articleCategory = articleCategory;
    }

    @Override
    public String toString() {
        return "Article [> content
                + ", categoryId=" + categoryId + ", articleCategory=" + articleCategory + "]";
    }
}

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