/// <summary>
/// 查询表信息
/// </summary>
/// <param name="conStr"></param>
/// <param name="sql"></param>
/// <returns></returns>
internal async static Task <DataTable> QueryTableInfo(string conStr, string sql)
{
return(await Task.Run(() =>
{
DataTable dt = new DataTable();
PostgreSqlHelper.con = PostgreSqlHelper.NewConnectionMethod(conStr);
var cmd = new NpgsqlCommand(sql, PostgreSqlHelper.con);
try
{
PostgreSqlHelper.con.Open();
NpgsqlDataReader sdr = cmd.ExecuteReader(CommandBehavior.KeyInfo);
dt = sdr.GetSchemaTable(); //获得表的结构
sdr.Close();
PostgreSqlHelper.con.Close();
PostgreSqlHelper.con.Dispose();
}
catch (Exception e)
{
PostgreSqlHelper.con.Close();
PostgreSqlHelper.con.Dispose();
throw e;
}
return dt;
}));
}
/// <summary>
/// 查询方法 返回DataTable
/// </summary>
/// <param name="conStr"></param>
/// <param name="sql"></param>
/// <param name="list"></param>
/// <returns></returns>
internal async static Task <DataTable> QueryDataTable(string conStr, string sql, List <NpgsqlParameter> list = null)
{
return(await Task.Run(() =>
{
DataTable dt = new DataTable();
using (PostgreSqlHelper.con = PostgreSqlHelper.NewConnectionMethod(conStr))
{
var sda = new NpgsqlDataAdapter(sql, PostgreSqlHelper.con);
if (list != null)
{
foreach (NpgsqlParameter item in list)
{
sda.SelectCommand.Parameters.Add(item);
}
}
try
{
sda.Fill(dt);
sda.Dispose();
PostgreSqlHelper.con.Close();
PostgreSqlHelper.con.Dispose();
}
catch (Exception e)
{
PostgreSqlHelper.con.Close();
PostgreSqlHelper.con.Dispose();
throw e;
}
return dt;
}
}));
}
/// <summary>
/// 测试连接
/// </summary>
/// <param name="conStr">连接字符串</param>
/// <returns></returns>
internal async static Task <bool> TestLink(string conStr)
{
return(await Task.Run(() =>
{
PostgreSqlHelper.con = PostgreSqlHelper.NewConnectionMethod(conStr);
try
{
PostgreSqlHelper.con.Open();
if (PostgreSqlHelper.con.State == ConnectionState.Open)
{
PostgreSqlHelper.con.Close();
PostgreSqlHelper.con.Dispose();
return true;
}
return false;
}
catch (Exception ex)
{
PostgreSqlHelper.con.Close();
PostgreSqlHelper.con.Dispose();
throw ex;
}
}));
}
