public class SystemDB
{
public SystemDB()
{
//
// 此处: 添加构造函数
//
}
public static string ConnectionString = "Data Source=数据库地址;Initial Catalog=数据库名称;Persist Security Info=True;User ID=帐号;Password=密码";
//根据sql语句返回一个DataSet
#region GetDataSet
public DataSet GetDataSet(string sql)
{
SqlCommand sqlcom = new SqlCommand();
using (SqlConnection conn = new SqlConnection(ConnectionString))
{
PrepareCommand(sqlcom, conn, CommandType.Text, sql);
SqlDataAdapter sda = new SqlDataAdapter();
sda.SelectCommand = sqlcom;
DataSet ds = new DataSet();
sda.Fill(ds);
sqlcom.Parameters.Clear();
return ds;
}
}
#endregion
//根据sql语句返回一个SqlDataReader
#region ExecSqlDataReader
public SqlDataReader ExecSqlDataReader(string sql)
{
SqlCommand sqlcom = new SqlCommand();
SqlConnection conn = new SqlConnection(ConnectionString);
try
{
PrepareCommand(sqlcom, conn, CommandType.Text, sql);
SqlDataReader sdr = sqlcom.ExecuteReader(CommandBehavior.CloseConnection);
sqlcom.Parameters.Clear();
return sdr;
}
catch (Exception ex)
{
conn.Close();
throw ex;
}
}
#endregion
//执行sql语句，返回影响行数
#region ExecCommand
public int ExecCommand(string sql)
{
SqlCommand sqlcom = new SqlCommand();
using (SqlConnection conn = new SqlConnection(ConnectionString))
{
PrepareCommand(sqlcom, conn, CommandType.Text, sql);
int rtn = sqlcom.ExecuteNonQuery();
sqlcom.Parameters.Clear();
return rtn;
}
}
#endregion
