jdbc鏈接oracle語法

public class LangDemo {  public static void main(String[] args) throws Exception{      try {                 //加載驅動
                Class.forName("oracle.jdbc.driver.OracleDriver");                //建立鏈接
                Connection   cn=DriverManager.getConnection("jdbc:oracle:thin:@127.0.0.1:1521:XE","hh","hh");
                Statement sm=cn.createStatement();                //得到結果集
                ResultSet rs=sm.executeQuery("select name,nickname,id from a");                //遍歷結果集
                 while(rs.next()){
System.out.println("name:"+rs.getString(1));//rs.getString(「name」)System.out.println("nickname:"+rs.getString(2));  //rs.getInt(「id」)}
        } catch (Exception e) {
                   e.printStackTrace();
        }finally{   // rs.close();                               // conn.close();                 }
    }
}

public class LangDemo {  public static void main(String[] args) throws Exception{
    Connection con = null;// 建立一個數據庫鏈接
       PreparedStatement pre = null;// 建立預編譯語句對象，通常都是用這個而不用Statement
       ResultSet result = null;// 建立一個結果集對象
     try
      {
        Class.forName("oracle.jdbc.driver.OracleDriver");// 加載Oracle驅動程序
        System.out.println("開始嘗試鏈接數據庫！");
        String url = "jdbc:oracle:" + "thin:@127.0.0.1:1521:XE"; // 127.0.0.1是本機地址，XE是精簡版Oracle的默認數據庫名
        String user ="system";// 用戶名,系統默認的帳戶名
        String password = "147";// 你安裝時選設置的密碼
        con = DriverManager.getConnection(url, user, password);// 獲取鏈接
        System.out.println("鏈接成功！");
        String sql = "select * from student where name=?";// 預編譯語句，「？」表明參數
        pre = con.prepareStatement(sql);// 實例化預編譯語句
        pre.setString(1, "張三");// 設置參數，前面的1表示參數的索引，而不是表中列名的索引
        result = pre.executeQuery();// 執行查詢，注意括號中不須要再加參數
        while (result.next())            // 當結果集不爲空時
            System.out.println("學號:" + result.getInt("id") + "姓名:"
                    + result.getString("name"));
     }      catch (Exception e)
       {
            e.printStackTrace();
        }       finally  {
            ……..
        } 
    }
}

 jdbc也有事物：connection.setAutoCommit(false) 默認是true自動提交

　　                  connection.commit();

                         connection.rollback();

public class LangDemo {    public static void main(String[] args) throws Exception{        try {            //加載驅動
            Class.forName("oracle.jdbc.driver.OracleDriver");            //建立鏈接
            Connection cn=DriverManager.getConnection("jdbc:oracle:thin:@127.0.0.1:1521:XE","hh","hh");            //調用存儲過程(存儲過程的兩個值都是in)
           CallableStatement sm=cn.prepareCall("{call lv_three(?,?)}");           //賦值
           sm.setString(1, "jerry");
           sm.setInt(2, 1800);
           sm.execute();           //釋放資源           sm.close();
           cn.close();
        } catch (Exception e) {
            e.printStackTrace();
        }finally{  
             // sm.close();             // conn.close();        }
    }
}

public class LangDemo {    public static void main(String[] args) throws Exception{        try {            //加載驅動
            Class.forName("oracle.jdbc.driver.OracleDriver");            //建立鏈接
            Connection   cn=DriverManager.getConnection("jdbc:oracle:thin:@127.0.0.1:1521:XE","hh","hh");            //調用存儲過程(存儲過程的第一個參數是in,第二個參數是out)
           CallableStatement sm=cn.prepareCall("{call lv_four(?,?)}");           //賦值
           sm.setInt(1, 1);
           sm.registerOutParameter(2, oracle.jdbc.OracleTypes.VARCHAR);//固定的           　　　  sm.execute() String namestr=sm.getString(2);
           System.out.println("名稱是："+namestr);           
           sm.close(); //釋放資源           cn.close();
        } catch (Exception e) {
                   e.printStackTrace();
        }finally{ 
        　　 // sm.close();            // conn.close();        }
    }
}

public class LangDemo {  public static void main(String[] args) throws Exception{      try {            //加載驅動
            Class.forName("oracle.jdbc.driver.OracleDriver");            //建立鏈接
            Connection   cn=DriverManager.getConnection("jdbc:oracle:thin:@127.0.0.1:1521:XE","hh","hh");            //調用存儲過程(兩個out參數)
           CallableStatement sm=cn.prepareCall("{call lv_four(?,?)}");           //賦值
           sm.registerOutParameter(1, oracle.jdbc.OracleTypes.NUMBER);
           sm.registerOutParameter(2, oracle.jdbc.OracleTypes.VARCHAR);
           sm.execute();            int sid=sm.getInt(1);
           String namestr=sm.getString(2);
           System.out.println(「名稱是：」+namestr+」id是」+sid);           
           sm.close(); //釋放資源           cn.close();
        } catch (Exception e) {
            e.printStackTrace();
        }finally{            // sm.close();            // conn.close();        }
    }
}

public class LangDemo {  public static void main(String[] args) throws Exception{      try {           //加載驅動
           Class.forName("oracle.jdbc.driver.OracleDriver");           //建立鏈接
           Connection   cn=DriverManager.getConnection("jdbc:oracle:thin:@127.0.0.1:1521:XE","hh","hh");           //調用存儲過程(參數爲in out類型)
           CallableStatement sm=cn.prepareCall("{call getsal(?)}");           //賦值
          sm.setInt(1,1);    //  sm.setDouble(1,800);
      sm.registerOutParameter(1, oracle.jdbc.OracleTypes.NUMBER);          
       sm.execute();          int sid=sm.getInt(1);    // double d = sm.getDouble(1)
          System.out.println("id是："+sid);           
          sm.close(); //釋放資源          cn.close();
        } catch (Exception e) {
                   e.printStackTrace();
        }finally{  
             // sm.close();             // conn.close();        }
    }
}

若是是鏈接mysql

加載驅動：

 Class.forName("com.mysql.jdbc.Driver");
 String url="jdbc:mysql://localhost:3306/db_pms";       //注意：db_pms是自定義數據庫的名字