public static bool Exists <T>(this DbContext connInfo, object[] pkValues, string tableName = "", bool forUpdate = false)
where T : new()
{
if (0 == (pkValues?.Length ?? 0))
{
throw new Exception("Primary keys are missing!");
}
Type t = typeof(T);
TableInfo tableInfo = GetTableInfo(t, 0, tableName);
if (0 == (tableInfo?.PKeys?.Count() ?? 0))
{
throw new ArgumentNullException("PKeys");
}
RequestBase param = new RequestBase();
int j = 0;
foreach (string pkName in tableInfo.PKeys)
{
param.Add(pkName, pkValues[j]);
++j;
}
string sql = connInfo.GetExistsSql(t, tableName);
if (forUpdate && connInfo.SupportForUpdate)
{
sql += " for update";
}
return(connInfo.Db.ExecuteScalar <string>(sql, param, connInfo.Transaction, commandType: CommandType.Text).IsTrue());
}
public static bool Exists <T>(this DbContext connInfo, T record, string tableName = "", bool forUpdate = false) where T : new()
{
string sql = connInfo.GetExistsSql(typeof(T), tableName);
if (forUpdate && connInfo.SupportForUpdate)
{
sql += " for update";
}
return(connInfo.Db.ExecuteScalar <string>(sql, record, connInfo.Transaction, commandType: CommandType.Text).IsTrue());
}
