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public class db {private String dbDriver="com.microsoft.jdbc.sqlserver.SQLServerDriver";private String sConnStr = "jdbc:microsoft:sqlserver://localhost:1433;databasename=liuyou"; public Connection connect = null;public ResultSet rs=null;public db() {try {Class.forName(dbDriver).newInstance(); connect = DriverManager.getConnection(sConnStr,"sa","123456"); }catch (Exception ex) {System.out.println("12121");}}public ResultSet executeQuery(String sql) {try{connect=DriverManager.getConnection(sConnStr,"sa","123456");Statement stmt=connect.createStatement();rs=stmt.executeQuery(sql);}catch(SQLException ex){System.err.println(ex.getMessage());}return rs;}public void executeUpdate(String sql){Statement stmt=null;rs=null;try{ connect=DriverManager.getConnection(sConnStr,"sa","123456");stmt=connect.createStatement();stmt.executeUpdate(sql);stmt.close();connect.close();}catch(SQLException ex){System.err.println(ex.getMessage());}}">