briup_JDBC_自建工具类

1.操作的环境 STS,mysql,oracle

orcle 所操作的数据库名为 ORCL 表为 m_stu

表结构如下

mysql  的表为：my_stu

表结构如下

工具类完整代码

 package com.briup.jdbc;

 import java.sql.Connection;
 import java.sql.DriverManager;
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.sql.Statement;

 import com.mysql.jdbc.PreparedStatement;
 import com.sun.javafx.geom.AreaOp.AddOp;

 public class jdbcUtils {
     // 获取连接
     public static Connection getConnection(String str) {

         if ("mysql".equals(str)) {
             try {
                 Class.forName("com.mysql.jdbc.Driver");
                 String url = "jdbc:mysql://127.0.0.1:3306/my_database?characterEncoding=UTF-8";
                 String username = "root";
                 String password = "yue170305";
                 try {
                     Connection conn = DriverManager.getConnection(url, username, password);
                     System.out.println("连接到mysql数据库");
                     return conn;
                 } catch (SQLException e) {
                     e.printStackTrace();
                 }
             } catch (ClassNotFoundException e) {
                 e.printStackTrace();
             }

         }
         if ("oracle".equals(str)) {
             try {
                 Class.forName("oracle.jdbc.driver.OracleDriver");
                 String url = "jdbc:oracle:thin:@localhost:1521:ORCL";
                 String username = "scott";
                 String password = "yue170305";
                 try {
                     Connection conn = DriverManager.getConnection(url, username, password);
                     System.out.println("连接到orcle数据库");
                     return conn;
                 } catch (SQLException e) {
                     e.printStackTrace();
                 }
             } catch (ClassNotFoundException e) {
                 e.printStackTrace();
             }

         }
         return null;

     }

     // 删除数据
     public static void delete(Connection conn, String sql) {
         try {
             Statement statement = conn.createStatement();
             try {
                 statement.execute(sql);
                 System.out.println("删除数据成功!");
             } catch (Exception e) {
                 System.err.println("出现问题了" + e.getMessage());
                 e.printStackTrace();
             } finally {
                 close(statement, null, conn);
             }
         } catch (SQLException e) {
             e.printStackTrace();
         }
     }
     //修改一条数据
     public static void Update(Connection conn, String sql) {
         try {
             Statement statement = conn.createStatement();
             try {
                 statement.execute(sql);
                 System.out.println("修改数据成功");
             } catch (Exception e) {
                 System.err.println("出现问题了" + e.getMessage());
                 e.printStackTrace();
             } finally {
                 close(statement, null, conn);
             }

         } catch (SQLException e) {
             e.printStackTrace();
         }
     }
     //查询记录
     public static void select(Connection conn, String sql) {
             try {
                 Statement statement = conn.createStatement();
                 ResultSet res = statement.executeQuery(sql);
                 while(res.next()) {
                     int id=res.getInt("id");
                     String name=res.getString("name");
                     int age=res.getInt("age");
                     String sex=res.getString("sex");
                     System.out.println("id="+id+","+"name="+name+","+"age="+age+","+"sex="+sex);
                 }
             } catch (SQLException e) {
                 e.printStackTrace();
             }finally {
                 close(null, null, conn);
             }

     }
     // 添加一条数据
     public static void add(Connection conn, String sql) {
         try {
             Statement statement = conn.createStatement();
             try {
                 statement.execute(sql);
                 System.out.println("插入数据成功!");
             } catch (Exception e) {
                 System.err.println("出现问题了" + e.getMessage());
                 e.printStackTrace();
             } finally {
                 close(statement, null, conn);
             }

         } catch (SQLException e) {
             e.printStackTrace();
         }
     }

     // 关闭连接
     public static void close(Statement st, ResultSet rs, Connection conn) {
         if (st != null) {
             try {
                 st.close();
             } catch (SQLException e) {
                 e.printStackTrace();
             }
         }
         if (rs != null) {
             try {
                 rs.close();
             } catch (SQLException e) {
                 e.printStackTrace();
             }
         }
         if (conn != null) {
             try {
                 conn.close();
             } catch (SQLException e) {
                 e.printStackTrace();
             }
         }

     }

 }

测试类代码

package com.briup.jdbc;

import java.sql.Connection;

public class Test {
    public static void main(String[] args) {
        //连接到mysql数据库
//        Connection connection = jdbcUtils.getConnection("mysql");
//        String sql="insert into my_stu values(8,'dadaming',108,'m')";
        //jdbcUtils.add(connection, sql);

        //删除数据(mysql)
//        String sql2="delete from my_stu where id=1";
//        jdbcUtils.delete(connection, sql2);

        //连接到oracle数据库
        Connection connection2 = jdbcUtils.getConnection("oracle");
        String sql1="insert into m_stu values(7,'lifd',15,'n')";
        String sql2="delete from m_stu where id=1";
        String sql3=" update m_stu "
                    + "set name='李悦'"
                    + "where id=1";
        String sql4="select * from m_stu";
        //jdbcUtils.add(connection2, sql1);
        //jdbcUtils.delete(connection2, sql2);
        //jdbcUtils.Update(connection2, sql3);
        jdbcUtils.select(connection2, sql4);

    }
}