link.java~44~

基于java+sql2000超市货品进销存管理

package supermarket;

//SQL连接类
import java.sql.*;

import javax.swing.*;

public class Link {
  public Link() {
    try {
      jbInit();
    }
    catch (Exception ex) {
      ex.printStackTrace();
    }
  }

  Connection con = null; //连接
  Statement s = null; //Statement
  ResultSet rs = null; //结果集
  int count = 0;
  public void connection() {
    try {
      Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");
      con = DriverManager.getConnection(
          "jdbc:microsoft:sqlserver://127.0.0.1:1433;databaseName=supermarket;","sa","");
      s = con.createStatement();
    }
    catch (ClassNotFoundException ex) {
    }
    catch (SQLException ex) {
      /** @todo Handle this exception */
    }
  }

  public void close() {
    try {
      if (rs != null) { //关闭结果集
        rs.close();
      }
      if (s != null) {
        s.close(); //关闭Statement
      }
      con.close(); //关闭连接
    }
    catch (SQLException ex) {
    }
  }

  public ResultSet Select(String sql) { //查询方法
   // System.out.println(sql);
    try {
      rs = s.executeQuery(sql);
      // MainFrm mf = new MainFrm();
      return rs;
    }
    catch (SQLException ex) {
      JOptionPane.showMessageDialog(null, "出错啦！", "错误",
                                    JOptionPane.ERROR_MESSAGE);
      //ex.printStackTrace();
    }
    return rs;
  }

  private void jbInit() throws Exception {
  }

  public int Update(String sql) {
    System.out.println(sql);
    try {
      count = s.executeUpdate(sql);
      return count;
    }
    catch (SQLException ex) {
      JOptionPane.showMessageDialog(null, "操作失败", "错误",
                                    JOptionPane.ERROR_MESSAGE);
//      return;
    }
    return 0;
  }

  /**
   * Select
   */
  public void Select() {
  }
}