【JDBC】基本开发步骤

1、准备工作

new   java project ->  导入 sqljdbc4.jar 包  ---> build path

2、JDBC小程序

2.1 查询 数据库中的信息

 import java.sql.*;

 public class  TestJDBC {
      public static void main(String[] args) {
             Connection con = null;
             Statement stmt = null;
             ResultSet rs = null ;
             try{
                 Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");//加载驱动程序
                 String url = "jdbc:sqlserver://localhost;database = test; user = sa;password = 1234";
                  con = DriverManager.getConnection(url); //创建连接对象
                  stmt = con.createStatement();
                  rs = stmt.executeQuery("select * from users");
                 while(rs.next()){  //循环取得结果集，rs指示在最顶端
                     String name = rs.getString("name");
                     int psw = rs.getInt("psw");
                     System.out.println(name+"  "+psw);
                 }
             }catch(ClassNotFoundException e){
                 e.printStackTrace();
             }catch(SQLException e){
                 e.printStackTrace();
             }finally{
                 try{
                    if(rs != null){
                        rs.close();
                    }
                    if(stmt != null){
                     stmt.close();
                    }
                    if(con != null){
                     con.close();
                    }
                 }catch(SQLException e){
                     e.printStackTrace();
                 }
             }
         }
 }

2.2 更新数据库中的信息

 import java.sql.*;

 public class  TestDML {
      public static void main(String[] args) {
             Connection con = null;
             Statement stmt = null;
             try{
                 Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");//加载驱动程序
                 String url = "jdbc:sqlserver://localhost;database = test; user = sa;password = 1234";
                  con = DriverManager.getConnection(url); //创建连接对象
                  stmt = con.createStatement();
                  String sql ="insert into users values('james','33332')";
                  stmt.executeUpdate(sql);
             }catch(ClassNotFoundException e){
                 e.printStackTrace();
             }catch(SQLException e){
                 e.printStackTrace();
             }finally{
                 try{
                    if(stmt != null){
                     stmt.close();
                    }
                    if(con != null){
                     con.close();
                    }
                 }catch(SQLException e){
                     e.printStackTrace();
                 }
             }
         }
 }

2.3  preparedStatement  使用 

 public class  BallGame {
      public static void main(String[] args) {
             Connection con = null;
             PreparedStatement pstmt = null;
             try{
                 Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");//加载驱动程序
                 String url = "jdbc:sqlserver://localhost;database = test; user = sa;password = 1234";
                  con = DriverManager.getConnection(url); //创建连接对象
                  pstmt = con.prepareStatement("insert into users values(?,?)");   //占位符，简单不易出错
                  pstmt.setString(1, "jordan");
                  pstmt.setInt(2, 3434443);
                  pstmt.executeUpdate();
             }catch(ClassNotFoundException e){
                 e.printStackTrace();
             }catch(SQLException e){
                 e.printStackTrace();
             }finally{
                 try{
                    if(pstmt != null){
                     pstmt.close();
                    }
                    if(con != null){
                     con.close();
                    }
                 }catch(SQLException e){
                     e.printStackTrace();
                 }
             }
         }
 }

2.4 callableStatement 存储过程处理 、 批处理  addBatch 、 excecuteBatch   调用 

      pstmt = con.prepareStatement("insert into users values(?,?)");
      pstmt.setString(1, "jordan");
      pstmt.setInt(2, 3434443);
      pstmt.addBatch();  // 进行批处理
      pstmt.setString(1, "ruby");
      pstmt.setInt(2, 34333443);
      pstmt.addBatch();
      Statement stmt = con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,
      ResultSet.CONCUR_READ_ONLY);//要回滚的话，必须设置这两个参数
      ResultSet rs = stmt.executeQuery("select * from users");
      rs.next();
      System.out.println(rs.getString(1));
      rs.last();
      System.out.println(rs.getString(1));
      System.out.println(rs.isLast());
      System.out.println(rs.getRow());
      rs.previous();
      System.out.println(rs.getString(1));
      rs.absolute(3);
      System.out.println(rs.getString(1));
      pstmt.executeBatch();

2、5可以滚动的结果集

       Statement stmt = con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,
       ResultSet.CONCUR_READ_ONLY);//要回滚的话，必须设置这两个参数
       ResultSet rs = stmt.executeQuery("select * from users");
       rs.next();
       System.out.println(rs.getString(1));
       rs.last();
       System.out.println(rs.getString(1));
       System.out.println(rs.isLast());
       System.out.println(rs.getRow());// 共有多少条记录
       rs.previous();
       System.out.println(rs.getString(1));
       rs.absolute(3);
       System.out.println(rs.getString(1));