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;
}
}
}