mybatis

https://www.w3cschool.cn/mybatis/mybatis-dyr53b5w.html

pom.xml

<?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>yubing</groupId>
    <artifactId>jdbc</artifactId>
    <version>1.0-SNAPSHOT</version>
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>8</source>
                    <target>8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
    <dependencies>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.2.12.RELEASE</version>
        </dependency>
    </dependencies>
</project>

db.properties

db.user=test
db.password=
db.url=jdbc:mysql://localhost:3306/test?useSSL=no
db.driverClass=com.mysql.jdbc.Driver

公用类Db.java

import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.datasource.DriverManagerDataSource;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
public class Db {
    public static JdbcTemplate getJdbcTemplate() {
        // 创建Properties类对象
        Properties properties = new Properties();
        try {
            // 读取properties属性文件到输入流中
            InputStream is = Db.class.getResourceAsStream("/db.properties");
            // 从输入流中加载属性列表
            properties.load(is);
        } catch (IOException e) {
            e.printStackTrace();
        }
        // 获取spring的JdbcTemplate
        DriverManagerDataSource dataSource = new DriverManagerDataSource();
        dataSource.setDriverClassName(properties.getProperty("db.driverClass"));
        dataSource.setUrl(properties.getProperty("db.url"));
        dataSource.setUsername(properties.getProperty("db.user"));
        dataSource.setPassword(properties.getProperty("db.password"));
        return new JdbcTemplate(dataSource);
    }
}

Demo测试类

import org.springframework.jdbc.core.JdbcTemplate;
import java.util.List;
import java.util.Map;
public class Demo04 {
    public static void main(String[] args) {
        String sql = null;
        JdbcTemplate jdbcTemplate = Db.getJdbcTemplate();
//  查询
        sql = "select * from test";
        List<Map<String, Object>> users = jdbcTemplate.queryForList(sql);
        for (Map<String, Object> user : users) {
            System.out.println(user);
        }
//        查询为字符串
        sql = "select name from test";
        List<String> list = jdbcTemplate.queryForList(sql, String.class);
        for (String str : list) {
            System.out.println(str);
        }
//        增加记录
        sql = "insert into test set name=?";
        jdbcTemplate.update(sql, "dfa");
        //修改记录
        sql = "update test set name=? where id=?";
        jdbcTemplate.update(sql, "fdsdf", 3);
    }
}

示例代码可以参考
链接：https://pan.baidu.com/s/198bZHeQS2o17p5oa8exSNA
提取码：java