mybatis（一）-----创建maven项目

版权声明：转载请指明出处 https://blog.csdn.net/weixin_42321963/article/details/82827243

第一步：创建新项目，按图如下：

接下来：

接下来照着填：

接下来：下一步，下一步，一直到创建：

创建完成。

后续：

第一步：修改maven项目中的pom.xml文件

代码如下：

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.zit</groupId>
  <artifactId>mybatis01</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>

  <name>mybatis01</name>

  <dependencies>
    <!-- https://mvnrepository.com/artifact/junit/junit -->
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <scope>test</scope>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.4.6</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>8.0.12</version>
    </dependency>

  </dependencies>

  <build>
    <finalName>${project.artifactId}</finalName>
    <testSourceDirectory>src/test/java</testSourceDirectory>
    <sourceDirectory>src/main/java</sourceDirectory>
    <!-- 解决无法加载资源配置文件 -->
    <resources>
      <resource>
        <directory>src/main/java</directory>
        <includes>
          <include>**/*.xml</include>
          <include>**/*.properties</include>
        </includes>
      </resource>
      <resource>
        <directory>src/main/resources</directory>
        <includes>
          <include>**/*.xml</include>
          <include>**/*.properties</include>
        </includes>
      </resource>
    </resources>
  </build>
</project>

项目有问题暂时不用担心，接着往下进行。

把左边的项目结构变成如下：

然后pom.xml恢复正常。

接下来：

在项目src/main/resources/mybatis-config.xml中输入代码：

<?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>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/dt_game?usrSSL=false&amp;serverTimezone=PRC"/>
                <property name="username" value="root"/>
                <property name="password" value=""/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper class="com.fz.mapper.StudentMapper"/>
    </mappers>
</configuration>

上面有和数据库相连的信息，注意和自己的数据库一一对应。

数据库信息
    localhost  db  student root 3306
    数据库名称为 db  账号 root 密码   端口3306 表数据信息
    mysql> select * from student;
    +--------+--------+-------+------------------+
    | id     | name   | score | address          |
    +--------+--------+-------+------------------+
    | 201601 | 李四   |    90 | 郑州市文化路68号 |
    | 201602 | 张三丰 |    30 | 郑州市东风路68号 |
    +--------+--------+-------+------------------+
    2 rows in set (0.01 sec)

配置就算简单完成了。

简单实验：

需要三个文件：

第一：src/main/java/com/zit/entity/建立Book.java,代码：

package com.zit.entity;

import java.math.BigDecimal;
import java.util.Date;

public class Book {
    private int id;
    private String name;
    private BigDecimal price;
    private Date btime;

    public Book() {
    }

    public Book(int id, String name, BigDecimal price, Date btime) {
        this.id = id;
        this.name = name;
        this.price = price;
        this.btime = btime;
    }

    public int getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public BigDecimal getPrice() {
        return price;
    }

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

    public Date getBtime() {
        return btime;
    }

    public void setBtime(Date btime) {
        this.btime = btime;
    }
}

第二：src/main/java/com/zit/mapper/目录下建立接口BookMapper代码如下：

package com.zit.mapper;


import com.zit.entity.Book;
import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Select;

import java.util.List;

public interface BookMapper {
    @Insert("insert into book values(null,#{name},#{price},#{btime})")
    public int save(Book book);

    @Select("select * from book")
    public List<Book> queryAll();

    @Delete("delete from book where id=#{id}")
    public int deleteById(int id);
}

第三：src/main/resources/conf.xml文件相应的修改如下：

<?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>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/dt_game?usrSSL=false&amp;serverTimezone=PRC"/>
                <property name="username" value="root"/>
                <property name="password" value=""/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper class="com.zit.mapper.BookMapper"/>
    </mappers>
</configuration>

最后在：src/main/test/java/目录下新建Demo.java文件：

代码如下：

import com.zit.entity.Book;
import com.zit.mapper.BookMapper;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import java.io.IOException;
import java.io.Reader;
import java.math.BigDecimal;
import java.util.Date;
import java.util.List;

public class Demo {
    protected SqlSessionFactory sf;
    protected SqlSession session;
    protected BookMapper bdao;

    @Before
    public void init() {
        System.out.println(3333);
        try {
            System.out.println("hello");
            Reader reader = Resources.getResourceAsReader("conf.xml");
            sf = new SqlSessionFactoryBuilder().build(reader);
            session = sf.openSession();
            bdao = session.getMapper(BookMapper.class);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    @After
    public void close(){
        session.commit();
    }

    @Test
    public void query() {
        System.out.println(33);
        List<Book> bks = bdao.queryAll();
        for (Book b : bks) {
            System.out.println(b.getName());
        }

    }

    @Test
    public void add() {
        Book bk = new Book();
        bk.setName("《web开发集合》");
        bk.setPrice(new BigDecimal(80));
        bk.setBtime(new Date());
        bdao.save(bk);
    }

    @Test
    public void del(){
        bdao.deleteById(3);
    }
}

单个测试，都是可以成功的，完成

目录结构不清楚的看下图：