private static void DetailPagingHelper_SqlCount(string fixedSql, string SELECTSQL, string SELECTWithoutOrder, string fromBodyString, string orderBodyString,
out string sqlCount)
{
bool hasOrderBy = !String.IsNullOrEmpty(orderBodyString);
//sqlCount
if (!DealHelper.hasDistinct(SELECTSQL))
{//## no DISTINCT
sqlCount = "SELECT COUNT(1) " + fromBodyString;
}
else
{//## has DISTINCT
if (hasOrderBy)
{
sqlCount = "SELECT COUNT(1) FROM ( " + SELECTWithoutOrder + ") as ___temp___sqlCount___";
}
else
{
sqlCount = "SELECT COUNT(1) FROM ( " + SELECTSQL + ") as ___temp___sqlCount___";
}
}
//----processing fixed sql----
sqlCount = fixedSql + "\r\n" + sqlCount;
//----------------------------
}
private static void DetailPagingHelper_SqlPageAndCount(SqlParameter[] paramValues, string orderBodyString, string SELECTWithoutOrder, string fixedSql, int pageIndex, int pageSize,
out string FINALSQL)
{
StringBuilder adjustedSQL = new StringBuilder();
bool hasDistinct = DealHelper.hasDistinct(SELECTWithoutOrder);
//##1 Add TOTAL column
if (!hasDistinct)
{
int firstSelectPos = SELECTWithoutOrder.IndexOf("SELECT ", StringComparison.OrdinalIgnoreCase);
adjustedSQL.Append("SELECT COUNT(*) OVER() AS ___totalCount___,");
adjustedSQL.AppendLine(SELECTWithoutOrder.Substring(firstSelectPos + 7));
}
else
{
adjustedSQL.Append("SELECT COUNT(*) OVER() AS ___totalCount___, * FROM ( ");
adjustedSQL.Append(SELECTWithoutOrder);
adjustedSQL.AppendLine(" ) as ___temp___selectBody___ ");
}
//##2 Handle OrderBy
bool HasOrderBy = !String.IsNullOrEmpty(orderBodyString);
if (HasOrderBy)
{
adjustedSQL.Append("ORDER BY ");
adjustedSQL.AppendLine(orderBodyString);
}
else
{
adjustedSQL.AppendLine("ORDER BY (select null) ");
}
//##3 Offset & Fetch
adjustedSQL.Append("OFFSET ");
adjustedSQL.Append((pageIndex - 1) * pageSize);
adjustedSQL.AppendLine(" ROWS ");
adjustedSQL.Append("FETCH NEXT ");
adjustedSQL.Append(pageSize);
adjustedSQL.AppendLine(" ROWS ONLY ");
//----processing fixed sql----
FINALSQL = fixedSql + "\r\n" + adjustedSQL.ToString();
//----------------------------
}