/// <exception cref="Couchbase.Lite.CouchbaseLiteException"></exception>
internal IList<QueryRow> ReducedQuery(Cursor cursor, Boolean group, Int32 groupLevel)
{
IList<object> keysToReduce = null;
IList<object> valuesToReduce = null;
object lastKey = null;
var reduce = Reduce;
// FIXME: If reduce is null, then so are keysToReduce and ValuesToReduce, which can throw an NRE below.
if (reduce != null)
{
keysToReduce = new AList<Object>(ReduceBatchSize);
valuesToReduce = new AList<Object>(ReduceBatchSize);
}
var rows = new AList<QueryRow>();
cursor.MoveToNext();
while (!cursor.IsAfterLast())
{
var keyData = FromJSON(cursor.GetBlob(0));
var value = FromJSON(cursor.GetBlob(1));
System.Diagnostics.Debug.Assert((keyData != null));
if (group && !GroupTogether(keyData, lastKey, groupLevel))
{
if (lastKey != null)
{
// This pair starts a new group, so reduce & record the last one:
var reduced = (reduce != null) ? reduce(keysToReduce, valuesToReduce, false) : null;
var key = GroupKey(lastKey, groupLevel);
var row = new QueryRow(null, 0, key, reduced, null);
row.Database = Database;
rows.AddItem(row); // NOTE.ZJG: Change to `yield return row` to convert to a generator.
keysToReduce.Clear();
valuesToReduce.Clear();
}
lastKey = keyData;
}
keysToReduce.AddItem(keyData);
valuesToReduce.AddItem(value);
cursor.MoveToNext();
}
// NOTE.ZJG: Need to handle grouping differently if switching this to a generator.
if (keysToReduce.Count > 0)
{
// Finish the last group (or the entire list, if no grouping):
var key = group ? GroupKey(lastKey, groupLevel) : null;
var reduced = (reduce != null) ? reduce(keysToReduce, valuesToReduce, false) : null;
var row = new QueryRow(null, 0, key, reduced, null);
row.Database = Database;
rows.AddItem(row);
}
return rows;
}
/// <summary>
/// Executes only read-only SQL.
/// </summary>
/// <returns>The query.</returns>
/// <param name="sql">Sql.</param>
/// <param name="paramArgs">Parameter arguments.</param>
public Cursor IntransactionRawQuery(String sql, params Object[] paramArgs)
{
if (!IsOpen)
{
Open(Path);
}
if (transactionCount == 0)
{
return RawQuery(sql, paramArgs);
}
var t = Factory.StartNew(() =>
{
Cursor cursor = null;
sqlite3_stmt command = null;
try
{
Log.V(TAG, "RawQuery sql: {0} ({1})", sql, String.Join(", ", paramArgs.ToStringArray()));
command = BuildCommand (_writeConnection, sql, paramArgs);
cursor = new Cursor(command);
}
catch (Exception e)
{
if (command != null)
{
command.Dispose();
}
Log.E(TAG, "Error executing raw query '{0}'".Fmt(sql), e);
LastErrorCode = raw.sqlite3_errcode(_writeConnection);
throw;
}
return cursor;
});
return t.Result;
}
/// <summary>
/// Executes only read-only SQL.
/// </summary>
/// <returns>The query.</returns>
/// <param name="sql">Sql.</param>
/// <param name="paramArgs">Parameter arguments.</param>
public Cursor RawQuery(String sql, params Object[] paramArgs)
{
if (!IsOpen)
{
Open(Path);
}
Cursor cursor = null;
sqlite3_stmt command = null;
var t = Factory.StartNew (() =>
{
try {
Log.V (TAG, "RawQuery sql: {0} ({1})", sql, String.Join (", ", paramArgs.ToStringArray ()));
command = BuildCommand (_readConnection, sql, paramArgs);
cursor = new Cursor (command);
} catch (Exception e) {
if (command != null) {
command.Dispose ();
}
var args = paramArgs == null
? String.Empty
: String.Join (",", paramArgs.ToStringArray ());
Log.E (TAG, "Error executing raw query '{0}' is values '{1}' {2}".Fmt (sql, args, _readConnection.errmsg ()), e);
LastErrorCode = raw.sqlite3_errcode(_readConnection);
throw;
}
return cursor;
});
return t.Result;
}
internal IList<QueryRow> ReducedQuery(Cursor cursor, bool group, int groupLevel)
{
IList<object> keysToReduce = null;
IList<object> valuesToReduce = null;
object lastKey = null;
if (GetReduce() != null)
{
keysToReduce = new AList<object>(ReduceBatchSize);
valuesToReduce = new AList<object>(ReduceBatchSize);
}
IList<QueryRow> rows = new AList<QueryRow>();
cursor.MoveToNext();
while (!cursor.IsAfterLast())
{
JsonDocument keyDoc = new JsonDocument(cursor.GetBlob(0));
JsonDocument valueDoc = new JsonDocument(cursor.GetBlob(1));
System.Diagnostics.Debug.Assert((keyDoc != null));
object keyObject = keyDoc.JsonObject();
if (group && !GroupTogether(keyObject, lastKey, groupLevel))
{
if (lastKey != null)
{
// This pair starts a new group, so reduce & record the last one:
object reduced = (reduceBlock != null) ? reduceBlock.Reduce(keysToReduce, valuesToReduce
, false) : null;
object key = GroupKey(lastKey, groupLevel);
QueryRow row = new QueryRow(null, 0, key, reduced, null);
row.SetDatabase(database);
rows.AddItem(row);
keysToReduce.Clear();
valuesToReduce.Clear();
}
lastKey = keyObject;
}
keysToReduce.AddItem(keyObject);
valuesToReduce.AddItem(valueDoc.JsonObject());
cursor.MoveToNext();
}
if (keysToReduce.Count > 0)
{
// Finish the last group (or the entire list, if no grouping):
object key = group ? GroupKey(lastKey, groupLevel) : null;
object reduced = (reduceBlock != null) ? reduceBlock.Reduce(keysToReduce, valuesToReduce
, false) : null;
QueryRow row = new QueryRow(null, 0, key, reduced, null);
row.SetDatabase(database);
rows.AddItem(row);
}
return rows;
}