springmvc+mybatis的增删改查入门

先到官网了解mybatis的语法：https://mybatis.org/mybatis-3/zh/sqlmap-xml.html

前端用了thymeleaf和vue.js，效果图和demo地址：https://gitee.com/cainiaoA/mybatis

thymeleaf获取java请求头  ctx='http://localhost:8017/
<script th:inline="javascript"> var ctx = [[@{/}]]; </script>

然后在pom.xml添加相关的引用

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.0.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.tushu</groupId>
    <artifactId>tushu</artifactId>
    <version>1.0.0</version>
    <name>tushu</name>
    <description>练习</description>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <!--spring-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.1</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <!--<dependency>-->
            <!--<groupId>org.springframework.boot</groupId>-->
            <!--<artifactId>spring-boot-starter-data-jpa</artifactId>-->
        <!--</dependency>-->
        <!--mysql驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>5.1.21</scope>
        </dependency>

        <!--引入druid-->
        <!-- https://mvnrepository.com/artifact/com.alibaba/druid -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.8</version>
        </dependency>

        <dependency>
            <groupId>org.bgee.log4jdbc-log4j2</groupId>
            <artifactId>log4jdbc-log4j2-jdbc4.1</artifactId>
            <version>1.16</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.13</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.7.13</version>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-api</artifactId>
            <version>2.0-beta9</version>
        </dependency>

        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-validator</artifactId>
            <version>6.1.0.Alpha6</version>
        </dependency>

        <!-- thymeleaf -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <!-- elastic search -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
        </dependency>
        <!-- 用了 elasticsearch 就要加这么一个，不然要com.sun.jna.Native 错误 -->
        <dependency>
            <groupId>com.sun.jna</groupId>
            <artifactId>jna</artifactId>
            <version>3.0.9</version>
        </dependency>

        <!-- thymeleaf legacyhtml5 模式支持 -->
        <dependency>
            <groupId>net.sourceforge.nekohtml</groupId>
            <artifactId>nekohtml</artifactId>
            <version>1.9.22</version>
        </dependency>

        <dependency>
            <groupId>net.minidev</groupId>
            <artifactId>json-smart</artifactId>
            <version>2.2.1</version>
        </dependency>

        <!--测试-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <!-- junit -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
        <!-- commons-lang -->
        <dependency>
            <groupId>commons-lang</groupId>
            <artifactId>commons-lang</artifactId>
            <version>2.6</version>
        </dependency>
        <!-- shiro -->
        <dependency>
            <groupId>org.apache.shiro</groupId>
            <artifactId>shiro-spring</artifactId>
            <version>1.3.2</version>
        </dependency>
        <!-- hsqldb -->
        <dependency>
            <groupId>org.hsqldb</groupId>
            <artifactId>hsqldb</artifactId>
        </dependency>
    </dependencies>
    <!--打包成插件-->
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

然后编写application.yml的相关配置

server:
  port: 8017

spring:
  datasource:
    #   数据源基本配置
    username: root
    password: 123456
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=true&serverTimezone=GMT%2B8
    type: com.alibaba.druid.pool.DruidDataSource
    #   数据源其他配置
    initialSize: 5
    minIdle: 5
    maxActive: 20
    maxWait: 60000
    timeBetweenEvictionRunsMillis: 60000
    minEvictableIdleTimeMillis: 300000
    validationQuery: SELECT 1 FROM DUAL
    testWhileIdle: true
    testOnBorrow: false
    testOnReturn: false
    poolPreparedStatements: true
    #   配置监控统计拦截的filters，去掉后监控界面sql无法统计，'wall'用于防火墙
    filters: stat,wall,log4j
    maxPoolPreparedStatementPerConnectionSize: 20
    useGlobalDataSourceStat: true
    connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500
  jackson:
    date-format: yyyy-MM-dd HH:mm:ss #如果使用字符串表示，用这行设置格式
    timezone: GMT+8
    serialization:
      write-dates-as-timestamps: false #使用时间戳，使用数值timestamp表示日期

mybatis:
  # 搜索指定包别名
  typeAliasesPackage: com.tushu.**.domain
  # 指定全局配置文件位置
  config-location: classpath:mybatis/mybatis-config.xml
  # 指定sql映射文件位置
  mapper-locations: classpath:mybatis/mapper/*Mapper.xml

mybatis相关配置

<?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>

    <settings>
        <setting name="mapUnderscoreToCamelCase" value="true"/>
        <setting name="logImpl" value="STDOUT_LOGGING"/>
    </settings>
</configuration>

然后就行相关的ioc和mybatis的数据文件操作

先编写domain，就是数据的model

package com.tushu.book.domain;

import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;

public class BaseEntity  implements Serializable {

    /** 请求参数 */
    private Map<String, Object> params;

    public Map<String, Object> getParams()
    {
        if (params == null)
        {
            params = new HashMap<>();
        }
        return params;
    }

    public void setParams(Map<String, Object> params)
    {
        this.params = params;
    }
}

package com.tushu.book.domain;

import java.util.Date;

public class books extends BaseEntity {
    /**
     * 编号
     */
    private int id;
    /**
     * 书名
     */
    private String title;
    /**
     * 价格
     */
    private double price;
    /**
     * 出版日期
     */
    private Date publishDate;

    public int getId() {
        return id;
    }

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

    public String getTitle() {
        return title;
    }

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

    public double getPrice() {
        return price;
    }

    public void setPrice(double price) {
        this.price = price;
    }

    public Date getPublishDate() {
        return publishDate;
    }

    public void setPublishDate(Date publishDate) {
        this.publishDate = publishDate;
    }

    @Override
    public String toString() {
        return "books{" +
                "id=" + id +
                ", title='" + title + '\'' +
                ", price=" + price +
                ", publishDate=" + publishDate +
                '}';
    }
}

然后编写mybatis数据操作，接口文件格式（xxxMapper.java）

package com.tushu.book.mapper;

import com.tushu.book.domain.books;

import java.util.List;

public interface BooksMapper {

    public int addBook(books model);

    public int updateBook(books model);

    public int deleteBook(int id);

    public List<books> queryBook(books model);
}

数据SQL语句的xml文件

<?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="com.tushu.book.mapper.BooksMapper"><!--xxxMapper所在的包--!>

    <resultMap type="books" id="booksResult">
        <id property="id" column="id"/>
        <result property="title" column="title"/>
        <result property="price" column="price"/>
        <result property="publishDate" column="publishDate"/>
        <!--<association property="dept"    column="dept_id" javaType="SysDept" resultMap="deptResult" />-->
        <!--<collection  property="roles"   javaType="java.util.List"        resultMap="RoleResult" />-->
    </resultMap>

    <!--<resultMap id="deptResult" type="SysDept">-->
    <!--<id     property="deptId"   column="dept_id"     />-->
    <!--<result property="parentId" column="parent_id"   />-->
    <!--</resultMap>-->

    <!--<resultMap id="RoleResult" type="SysRole">-->
    <!--<id     property="roleId"       column="role_id"        />-->
    <!--</resultMap>-->

    <select id="queryBook" parameterType="books" resultMap="booksResult">
        select * from books where 1=1
        <if test="title != null and title != ''">
            AND title=#{title}
        </if>
        <if test="price != null and price >0 ">
            AND price = #{price}
        </if>
        <if test="params.beginTime != null and params.beginTime != ''"><!-- 开始时间检索 -->
            AND date_format(publishDate,'%y%m%d') &gt;= date_format(#{params.beginTime},'%y%m%d')
        </if>
        <if test="params.endTime != null and params.endTime != ''"><!-- 结束时间检索 -->
            AND date_format(publishDate,'%y%m%d') &lt;= date_format(#{params.endTime},'%y%m%d')
        </if>
        <!-- 数据范围过滤 ${params.dataScope} -->

    </select>

    <delete id="deleteBook" parameterType="int">
         delete from books where id = #{id}
     </delete>

    <update id="updateBook" parameterType="books">
        update books
        <set>
            <if test="title != null and title != ''">title = #{title},</if>
            <if test="price != null and price >0 ">price = #{price},</if>
            publishDate = sysdate()
        </set>
        where id = #{id}
    </update>

    <insert id="addBook" parameterType="books" useGeneratedKeys="true" keyProperty="id">
        <selectKey keyProperty="id" order="AFTER" resultType="java.lang.Integer">
            SELECT LAST_INSERT_ID()
        </selectKey>
        insert into books(
        <if test="id != null and id > 0">id,</if>
        <if test="title != null and title != '' ">title,</if>
        <if test="price != null and price > 0 ">price,</if>
        publishDate
        )values(
        <if test="id != null and id > 0">#{id},</if>
        <if test="title != null and title != ''">#{title},</if>
        <if test="price != null and price >0 ">#{price},</if>
        sysdate()
        )
    </insert>

</mapper>

然后是是ico的实现

接口

package com.tushu.book.service;

import com.tushu.book.domain.books;

import java.util.List;

public interface IBooksService {
    public int addBook(books model);

    public int updateBook(books model);

    public int deleteBook(int id);

    public List<books> queryBook(books model);
}

实现类（逻辑），添加@Service注解和以接口名称+Impl结尾命名

package com.tushu.book.service.impl;

import com.tushu.book.domain.books;
import com.tushu.book.mapper.BooksMapper;
import com.tushu.book.service.IBooksService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class IBooksServiceImpl implements IBooksService {
    @Autowired
    private BooksMapper booksMapper;

    public int addBook(books model) {
        return booksMapper.addBook(model);
    }

    public int updateBook(books model) {
        return booksMapper.updateBook(model);
    }

    public int deleteBook(int id) {
        return booksMapper.deleteBook(id);
    }

    public List<books> queryBook(books model) {
        return booksMapper.queryBook(model);
    }
}

然后就是控制器的调用

package com.tushu.book.controller;

import com.tushu.book.domain.books;
import com.tushu.book.service.IBooksService;
import com.tushu.book.service.ITestDataService;
import org.apache.shiro.authz.annotation.RequiresPermissions;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.*;

import java.util.List;

@Controller
@RequestMapping("/system/books")
public class bookscontroller {
    private String prefix = "system/books";
    @Autowired
    IBooksService ibooksService;
    @Autowired
    ITestDataService testDataService;

    //页面
    @RequiresPermissions("system:books:view")
    @GetMapping()
    public String books() {
        return prefix;
    }
    //查询
    @ResponseBody
    @PostMapping("/query")
    public List<books> querybook(@Validated books model){
        List<books> data = ibooksService.queryBook(model);
        return data;
    }
    //添加
    @ResponseBody
    @PostMapping("/add")
    public books addBook(@Validated books model){
        int id = ibooksService.addBook(model);
        return model;
    }
    //修改
    @ResponseBody
    @PostMapping("/updatebook")
    public boolean updatebook(@Validated books model){
        int row = ibooksService.updateBook(model);
        return row >= 0 ? true:false;
    }
    //删除
    @ResponseBody
    @GetMapping("/deletebook/{id}")
    public boolean deletebook(@PathVariable("id") int id){
        int row = ibooksService.deleteBook(id);
        return row >= 0 ? true:false;
    }

    @ResponseBody
    @GetMapping("/speak/{str}")
    public String speak(@PathVariable("str") String str){
       return testDataService.speak(str);
    }

    @ResponseBody
    @RequestMapping("/getByName")
    public String getByName(String name){
        return "hi ,welcome to " + name;
    }
}