常用的数据库连接语句
一：Mysql的数据库连接语句
   
Class.forName("com.mysql.jdbc.Driver");
    Connection con = DriverManager.getConnection.("jdbc:mysql://localhost:3306/bookinfo","root","123");
    Statement st = con.createStatement();
    String sql = "select * from book";
    ResultSet rs = st.executeQuery(sql);
      while(rs.next()){
    }

二：sqlserver的数据库连接语句

Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");
    Connection con = DriverManager.getConnection.("jdbc:microsoft:sqlserver://localhost:1433;databaseName=bookinfo","sa","123");
 
 
  PreparedStatement ps = con.prepareStatement("select * from book");
  ResultSet rs = ps.executeQuery();
 
while(rs.next()){
  out.println(rs.getString(2));
 
  }


三：sqlserver2005的数据库连接语句
   
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
    Connection con = DriverManager.getConnection.("jdbc:sqlserver://localhost:1433;databaseName=bookinfo","sa","123");
 
 
  PreparedStatement ps = con.prepareStatement("select * from book");
 
 
  ResultSet rs = ps.executeQuery();
 
 
  while(rs.next()){
 
  out.println(rs.getString(2));
 
  }


四：oracle的数据库连接语句

jdbc:oracle:thin:@<server>[:<1521>]:<database_name>
Class.forName("oracle.jdbc.driver.OracleDriver");
    Connection con = DriverManager.getConnection.("jdbc:oracle:thin:@localhost:1521:bookinfo","zhangsan","123");
 
 
  PreparedStatement ps = con.prepareStatement("select * from book");
 
 
  ResultSet rs = ps.executeQuery();
 
 
  while(rs.next()){
 
  out.println(rs.getString(2));
 
  }