JDBC踩坑集合

JDBC向MySQL中添加字段时利用JUnit测试报错:java.lang.Exception: Method getConnection2() should be void，源码如下：

import org.junit.Test;
import java.io.InputStream;
import java.sql.*;
import java.util.Properties;

public class JDBCTest {

    @Test
    public Connection getConnection2() throws Exception {
        Properties properties = new Properties();

        InputStream in = this.getClass().getClassLoader().getResourceAsStream("JDBC.properties");
        properties.load(in);

        String driverClass = properties.getProperty("driver");
        String jdbcUrl = properties.getProperty("jdbcUrl");
        String user = properties.getProperty("user");
        String password = properties.getProperty("password");

        Class.forName(driverClass);

        return DriverManager.getConnection(jdbcUrl, user, password);
    }

    /**
     * 通过JDBC向指定的数据表中插入一条记录
     */
    @Test
    public void testStatement() throws Exception{
        //1.获取数据库链接
        Connection conn = getConnection2();

        //2.准备插入的SQL语句
        String sql = "INSERT INTO customers(`Name`,Email,Birth) VALUES('xiaoming','456@sina.com','2001-1-2');";

        //3.执行插入
        //(1)获取操作SQL语句的Statement对象：调用Connection的createStatement()方法来获取
        Statement statement = conn.createStatement();

        //(2)调用Statement对象的executeUpdate(sql)执行SQL语句进行插入
        statement.executeUpdate(sql);

        //(3)关闭Statement对象
        statement.close();

        //4.关闭连接
        conn.close();
    }
}

根据提示可以看到getConnection2()在测试单元里返回值必须是void，解决方法是注释掉getConnection2()方法上面的@Test语句