using System;
using System.Data;
using System.Data.SqlClient;

namespace View
{
  public class GetDatabase
  {
    private string strSQL;
    //与SQL Server的连接字符串设置
    //private string connectionString = "Server=***.***.*.***;Database=LOOKYX_MR;Uid=sa;Pwd=;";
    private string connectionString = "workstation id=localhost;Integrated Security=SSPI;database=jxcbook";
    //与数据库的连接
    private SqlConnection myConnection;
    private SqlCommandBuilder sqlCmdBld;
    private DataSet ds = new DataSet();
    private SqlDataAdapter da;

    public GetDatabase()
    {
      // TODO: 添加构造函数逻辑
    }

    //操作脱机数据库(创建了该类的实例时直接用) 根据输入的SQL语句检索数据库数据
    public DataSet SelectDataBase(string tempStrSQL,string tempTableName)
    {
      this.strSQL = tempStrSQL;
      this.myConnection = new SqlConnection(connectionString);
      this.da = new SqlDataAdapter(this.strSQL,this.myConnection);
      this.ds.Clear();
      this.da.Fill(ds,tempTableName);
      return ds;//返回填充了数据的DataSet,其中数据表以tempTableName给出的字符串命名
    }

    //数据库数据更新(传DataSet和DataTable的对象)
    public DataSet UpdateDataBase(DataSet changedDataSet,string tableName)
    {
      this.myConnection = new SqlConnection(connectionString);
      this.da = new SqlDataAdapter(this.strSQL,this.myConnection);
      this.sqlCmdBld = new SqlCommandBuilder(da);
      this.da.Update(changedDataSet,tableName);
      return changedDataSet;//返回更新了的数据库表
    }

    //直接操作数据库(未创建该类的实例时直接用) 检索数据库数据(传字符串,直接操作数据库)
    public DataTable SelectDataBase(string tempStrSQL)
    {
      this.myConnection = new SqlConnection(connectionString);
      DataSet tempDataSet = new DataSet();
      this.da = new SqlDataAdapter(tempStrSQL,this.myConnection);
      this.da.Fill(tempDataSet);
      return tempDataSet.Tables[0];
    }

    //数据库数据更新(传字符串,直接操作数据库)
    public int UpdateDataBase(string tempStrSQL)
    {
      this.myConnection = new SqlConnection(connectionString);
      //使用Command之前一定要先打开连接,后关闭连接,而DataAdapter则会自动打开关闭连接
      myConnection.Open();
      SqlCommand tempSqlCommand = new SqlCommand(tempStrSQL,this.myConnection);
      int intNumber = tempSqlCommand.ExecuteNonQuery();//返回数据库中影响的行数
      myConnection.Close();
      return intNumber;
    }
  }
}

posted on 2019-05-05 10:10  _萧朗  阅读(159)  评论(0编辑  收藏  举报