mybatis快速上手

配置pom.xml文件

<?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>test</groupId>
    <artifactId>mybatis</artifactId>
    <version>1.0-SNAPSHOT</version>
        <!-- MySQL驱动 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.6</version>
        </dependency>
        <!-- mybatis.jar -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.6</version>
        </dependency>
        <!-- junit.jar -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
    </dependencies>
</project>

配置mybatis-config.xml文件

<?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">
            <!-- 使用JDBC技术 -->
            <transactionManager type="JDBC"/>
            <!-- 数据库连接池,mybatis连接池 -->
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/mytest"/>
                <property name="username" value="huangxin"/>
                <property name="password" value="1538933906"/>
            </dataSource>
        </environment>
    </environments>
    <!-- 配置映射文件 -->
    <mappers>
        <mapper resource="ProductCaregoryMapper.xml"/>
    </mappers>
</configuration>

配置 ProductCaregoryMapper.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">
        <!-- Sql语句 -->
    <mapper namespace="category">
        <select id="fingAll" resultType="com.huangxin.model.ProductCategory">
      SELECT * FROM product
    </select>
    </mapper>

模型对象

Product.java

package com.huangxin.model;
import java.math.BigDecimal;
public class ProductCategory {
    private Long id;
    private String productName;
    private BigDecimal salePrice;
    private String supplier;
    private String brand;
    private BigDecimal costPrice;
    @Override
    public String toString() {
        return "ProductCategory{" +
                "id=" + id +
                ", productName='" + productName + '\'' +
                ", salePrice=" + salePrice +
                ", supplier='" + supplier + '\'' +
                ", brand='" + brand + '\'' +
                ", costPrice=" + costPrice +
                '}';
    }
    public Long getId() {
        return id;
    }
    public void setId(Long id) {
        this.id = id;
    }
    public String getProductName() {
        return productName;
    }
    public void setProductName(String productName) {
        this.productName = productName;
    }
    public BigDecimal getSalePrice() {
        return salePrice;
    }
    public void setSalePrice(BigDecimal salePrice) {
        this.salePrice = salePrice;
    }
    public String getSupplier() {
        return supplier;
    }
    public void setSupplier(String supplier) {
        this.supplier = supplier;
    }
    public String getBrand() {
        return brand;
    }
    public void setBrand(String brand) {
        this.brand = brand;
    }
    public BigDecimal getCostPrice() {
        return costPrice;
    }
    public void setCostPrice(BigDecimal costPrice) {
        this.costPrice = costPrice;
    }
}

SqlSessionTest.java

package com.huangxin.product;
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.Before;
import org.junit.Test;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
public class SqlSessionTest {
    private SqlSessionFactory sqlSessionFactory;
    /**
     * 初始化SqlSession工厂
     * @throws IOException
     */
    @Before
    public void init() throws IOException {
        //将全局配置文件读取
        InputStream in = Resources.getResourceAsStream("mybatis-config.xml");
        sqlSessionFactory = new SqlSessionFactoryBuilder().build(in);
    }
    @Test
    public void test(){
        // 获取一个sqlSession
        SqlSession sqlSession = sqlSessionFactory.openSession();
        List<Object> objects = sqlSession.selectList("category.fingAll");
        for (Object object : objects) {
            System.out.println(object);
        }
    }
}

输出结果为: