Mysql数据库的连接:(这个例子我只是测试Connection是否为null,检测是否连接成功)
package JDBC; import java.sql.Connection; import java.sql.DriverManager; import java.sql.SQLException; public class search { private static final String driver="com.mysql.jdbc.Driver"; private static final String url="jdbc:mysql://localhost:3306/" +"json?useSSL=false&useUnicode=true&characterEncoding=utf-8"; private static final String user="root"; private static final String password="1234"; private static Connection conn=null; static { try { Class.forName(driver); //注册驱动 } catch (ClassNotFoundException e) { e.printStackTrace(); } } public static Connection getConnection() { try { conn=DriverManager.getConnection(url, user, password); //建立连接 return conn; } catch (SQLException e) { e.printStackTrace(); return null; } } public static void main(String [] args) { Connection conn=search.getConnection(); if(conn!=null) { System.out.println("连接数据库成功"); }else { System.out.println("连接数据库失败"); } } }
Oracle数据连接:
package hello.ant; import java.sql.*; public class jdbc{ //设定一些参数 String url="jdbc:oracle:thin:@127.0.0.1:1521:orcl"; String user="root"; String password="1234"; Connection conn=null; Statement s; ResultSet r=null; public jdbc(){ try{ Class.forName("oracle.jdbc.driver.OracleDriver").newInstance(); //注册驱动 conn = DriverManager.getConnection(url,user,password); //建立连接 s=c.createStatement(); //创建Statement }catch(Exception e){ e.printStackTrace(); } } public boolean executeUpdate(String sql){ //根据传进来的sql语句更新数据库的数据 try { s.executeUpdate(sql); return true; }catch (SQLException e) { e.printStackTrace(); return false; } } public ResultSet executeQuery(String sql){ //根据传进来的sql语句查询数据库的数据,并返回结果集r try { r=s.executeQuery(sql); }catch(SQLException e) { e.printStackTrace(); } return r; } public void close() { //将结果集和statement关闭 try { r.close(); s.close(); }catch(Exception e) { e.printStackTrace(); } } public static void main(String[] args){ ResultSet r; jdbc j = new jdbc(); //实例化Model类 r=j.executeQuery("select * from test"); //调用查询的方法,并将sql语句传过去 try{ while (r.next()){ //遍历结果集 System.out.println(r.getString("id")); System.out.println(r.getString("name")); //打印查询到的数据 } }catch(Exception e){ e.printStackTrace(); } } }
时间: 2024-10-13 02:28:38