Java工具类-Jdbc工具类

简单玩一下：

1.pom.xml文件配置

 
 
        org.postgresql 
        postgresql 
        42.2.2 
 
 
        org.apache.commons
        commons-dbcp2
        provided

 2.工具类

import java.sql.*;
 
/**
 * 类名称：
 *
 * @author 李庆伟
 * @date 2023年10月23日 10:48
 */
public class JdbcUtil {
    private static final String DRIVER_NAME="org.postgresql.Driver";
    //连接数据的URL路径
    private static final String URL="jdbc:postgresql://localhost:5432/haha";
    //数据库登录账号
    private static final String USERNAME="postgres";
    //数据库登录密码
    private static final String PASSWORD="RBt47*XHy43GbH34";
 
 
    static{
        try {
            Class.forName(DRIVER_NAME);
        } catch (ClassNotFoundException e) {
            throw new ExceptionInInitializerError(e);
        }
    }
 
    //创建连接
    public static Connection getConnection(){
        try {
            return DriverManager.getConnection(URL, USERNAME, PASSWORD);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return null;
    }
 
    //查找
    public static ResultSet find(String sql) {
        Connection conn = JdbcUtil.getConnection();
        try {
            conn.setAutoCommit(false);
            Statement stat = conn.createStatement();
            ResultSet result = stat.executeQuery(sql);
            return result;
        } catch (SQLException e) {
            System.err.println( e.getClass().getName()+": "+ e.getMessage() );
        } finally {
        }
        return null;
 
    }
 
    //插入
    public static void insert(String sql) {
        Connection conn = JdbcUtil.getConnection();
        Statement stat = null;
        try {
            stat = conn.createStatement();
            stat.executeUpdate(sql);
        } catch (SQLException e) {
            System.err.println( e.getClass().getName()+": "+ e.getMessage() );
        } finally {
            try {
                stat.close();
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
 
}

3.测试类

import org.junit.Test;
 
import java.sql.ResultSet;
import java.sql.SQLException;
 
/**
 * 类名称：
 *
 * @author 李庆伟
 * @date 2023年10月23日 10:07
 */
public class DataTest {
 
    @Test
    public void firstTest() throws SQLException {
        String findSql = "SELECT test_id, test_name FROM test_one;";
        ResultSet rs = JdbcUtil.find(findSql);
 
        while (rs.next()) {
            String id = rs.getString("test_id");
            String name = rs.getString("test_name");
            System.out.println(id+"\t"+name);
        }
    }
 
    @Test
    public void insertTest() throws SQLException {
        //String findSql = "SELECT test_id, test_name FROM test_one;";
        String sql = "INSERT INTO test_one (test_id,test_name) "
                + "VALUES " + "('" + "5" + "', '" + "5"  + "')";
        JdbcUtil.insert(sql);
 
    }
}

记录一点点。。。。。。。。。。。。