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using System;
using System.Collections.Generic;
using System.Text;
using System.Data.SqlTypes;
using System.Data.SqlClient;
using Microsoft.SqlServer.Server;
using System.Data;
using System.Globalization;
namespace tSQLtCLR
{
class ResultSetFilter
{
private TestDatabaseFacade testDatabaseFacade;
public ResultSetFilter(TestDatabaseFacade testDatabaseFacade)
{
this.testDatabaseFacade = testDatabaseFacade;
}
public void sendSelectedResultSetToSqlContext(SqlInt32 resultsetNo, SqlString command)
{
validateResultSetNumber(resultsetNo);
SqlDataReader dataReader = testDatabaseFacade.executeCommand(command);
int ResultsetCount = 0;
if (dataReader.FieldCount > 0)
{
do
{
ResultsetCount++;
if (ResultsetCount == resultsetNo)
{
sendResultsetRecords(dataReader);
break;
}
} while (dataReader.NextResult());
}
dataReader.Close();
if(ResultsetCount < resultsetNo)
{
throw new InvalidResultSetException("Execution returned only " + ResultsetCount.ToString() + " ResultSets. ResultSet [" + resultsetNo.ToString() + "] does not exist.");
}
}
private void validateResultSetNumber(SqlInt32 resultsetNo)
{
if (resultsetNo < 0 || resultsetNo.IsNull)
{
throw new InvalidResultSetException("ResultSet index begins at 1. ResultSet index [" + resultsetNo.ToString() + "] is invalid.");
}
}
private static void sendResultsetRecords(SqlDataReader dataReader)
{
SqlMetaData[] meta = createMetaDataForResultset(dataReader);
SqlContext.Pipe.SendResultsStart(new SqlDataRecord(meta));
sendEachRecordOfData(dataReader, meta);
SqlContext.Pipe.SendResultsEnd();
}
private static void sendEachRecordOfData(SqlDataReader dataReader, SqlMetaData[] meta)
{
while (dataReader.Read())
{
SqlContext.Pipe.SendResultsRow(createRecordPopulatedWithData(dataReader, meta));
}
}
private static SqlDataRecord createRecordPopulatedWithData(SqlDataReader dataReader, SqlMetaData[] meta)
{
SqlDataRecord rec = new SqlDataRecord(meta);
object[] recordData = new object[dataReader.FieldCount];
dataReader.GetSqlValues(recordData);
rec.SetValues(recordData);
return rec;
}
private static SqlMetaData[] createMetaDataForResultset(SqlDataReader dataReader)
{
DataTable schema = dataReader.GetSchemaTable();
LinkedList<DataRow> columns = getDisplayedColumns(schema);
SqlMetaData[] meta = new SqlMetaData[columns.Count];
int columnCount = 0;
foreach (DataRow column in columns)
{
meta[columnCount] = createSqlMetaDataForColumn(column);
columnCount++;
}
return meta;
}
private static LinkedList<DataRow> getDisplayedColumns(DataTable schema)
{
LinkedList<DataRow> columns = new LinkedList<DataRow>();
foreach (DataRow row in schema.Rows) {
if (row["IsHidden"].ToString().ToLower() != "true")
{
columns.AddLast(row);
}
}
return columns;
}
private static SqlMetaData createSqlMetaDataForColumn(DataRow columnDetails)
{
SqlDbType dbType = (SqlDbType)columnDetails["ProviderType"];
String colName = (String)columnDetails["ColumnName"];
//String colTypeName = (String)columnDetails["TypeName"];
Type colType = (Type)columnDetails["DataType"];
switch (dbType)
{
case SqlDbType.BigInt:
case SqlDbType.Int:
case SqlDbType.SmallInt:
case SqlDbType.TinyInt:
case SqlDbType.Bit:
case SqlDbType.DateTime:
case SqlDbType.SmallDateTime:
case SqlDbType.Float:
case SqlDbType.Image:
case SqlDbType.Money:
case SqlDbType.SmallMoney:
case SqlDbType.Text:
case SqlDbType.NText:
case SqlDbType.Real:
case SqlDbType.Variant:
case SqlDbType.Timestamp:
case SqlDbType.UniqueIdentifier:
case SqlDbType.Xml:
case SqlDbType.Date:
case SqlDbType.Time:
return new SqlMetaData(colName, dbType);
case SqlDbType.Binary:
case SqlDbType.Char:
case SqlDbType.NChar:
return new SqlMetaData(colName, dbType, (int)columnDetails["ColumnSize"]);
case SqlDbType.VarBinary:
case SqlDbType.VarChar:
case SqlDbType.NVarChar:
int length = (int)columnDetails["ColumnSize"];
if (length > Int16.MaxValue)
{
length = -1;
}
return new SqlMetaData(colName, dbType, length);
case SqlDbType.Decimal:
case SqlDbType.DateTime2:
case SqlDbType.DateTimeOffset:
return new SqlMetaData(colName, dbType, Convert.ToByte(columnDetails["NumericPrecision"], CultureInfo.InvariantCulture), Convert.ToByte(columnDetails["NumericScale"], CultureInfo.InvariantCulture));
case SqlDbType.Udt:
return new SqlMetaData(colName, dbType, colType);
default:
throw new ArgumentException("Argument [" + dbType.ToString() + "] is not valid for ResultSetFilter.");
}
}
}
}