internal SqliteDataReader (SqliteCommand cmd, Sqlite3.Vdbe pVm, int version)
{
command = cmd;
rows = new List<object[]>();
column_names_sens = new Dictionary<String, Object>();
column_names_insens = new Dictionary<String, Object>( StringComparer.InvariantCultureIgnoreCase );
closed = false;
current_row = -1;
reading = true;
ReadpVm (pVm, version, cmd);
ReadingDone ();
}
internal void ReadpVm (Sqlite3.Vdbe pVm, int version, SqliteCommand cmd)
{
int pN;
IntPtr pazValue;
IntPtr pazColName;
bool first = true;
int[] declmode = null;
while (true) {
bool hasdata = cmd.ExecuteStatement(pVm, out pN, out pazValue, out pazColName);
// For the first row, get the column information
if (first) {
first = false;
if (version == 3) {
// A decltype might be null if the type is unknown to sqlite.
decltypes = new string[pN];
declmode = new int[pN]; // 1 == integer, 2 == datetime, 3 == guid
for (int i = 0; i < pN; i++) {
string decl = Sqlite3.sqlite3_column_decltype (pVm, i);
if (decl != null) {
decltypes[i] = decl.ToLower(System.Globalization.CultureInfo.InvariantCulture);
if (decltypes[i] == "int" || decltypes[i] == "integer")
declmode[i] = 1;
else if (decltypes[i] == "date" || decltypes[i] == "datetime")
declmode[i] = 2;
else if (decltypes[i] == "guid")
declmode[i] = 3;
}
}
}
columns = new string[pN];
for (int i = 0; i < pN; i++) {
string colName;
//if (version == 2) {
// IntPtr fieldPtr = Marshal.ReadIntPtr (pazColName, i*IntPtr.Size);
// colName = Sqlite.HeapToString (fieldPtr, ((SqliteConnection)cmd.Connection).Encoding);
//} else {
colName = Sqlite3.sqlite3_column_name (pVm, i);
//}
columns[i] = colName;
column_names_sens [colName] = i;
column_names_insens [colName] = i;
}
}
if (!hasdata) break;
object[] data_row = new object [pN];
for (int i = 0; i < pN; i++) {
/*
if (version == 2) {
IntPtr fieldPtr = Marshal.ReadIntPtr (pazValue, i*IntPtr.Size);
data_row[i] = Sqlite.HeapToString (fieldPtr, ((SqliteConnection)cmd.Connection).Encoding);
} else {
*/
switch (Sqlite3.sqlite3_column_type (pVm, i)) {
case 1:
long val = Sqlite3.sqlite3_column_int64 (pVm, i);
// If the column was declared as an 'int' or 'integer', let's play
// nice and return an int (version 3 only).
if (declmode[i] == 1 && val >= int.MinValue && val <= int.MaxValue)
data_row[i] = (int)val;
// Or if it was declared a date or datetime, do the reverse of what we
// do for DateTime parameters.
else if (declmode[i] == 2)
data_row[i] = DateTime.FromFileTime(val);
else
data_row[i] = val;
break;
case 2:
data_row[i] = Sqlite3.sqlite3_column_double (pVm, i);
break;
case 3:
data_row[i] = Sqlite3.sqlite3_column_text (pVm, i);
// If the column was declared as a 'date' or 'datetime', let's play
// nice and return a DateTime (version 3 only).
if (declmode[i] == 2)
if (data_row[i] == null) data_row[i] = null;
else data_row[i] = DateTime.Parse((string)data_row[i], System.Globalization.CultureInfo.InvariantCulture);
else if (declmode[i] == 3)
data_row[i] = Guid.Parse((string) data_row[i]);
break;
case 4:
int blobbytes = Sqlite3.sqlite3_column_bytes16 (pVm, i);
byte[] blob = Sqlite3.sqlite3_column_blob(pVm, i);
//byte[] blob = new byte[blobbytes];
//Marshal.Copy (blobptr, blob, 0, blobbytes);
data_row[i] = blob ?? new byte[0];
break;
case 5:
data_row[i] = null;
break;
default:
throw new Exception ("FATAL: Unknown sqlite3_column_type");
//}
}
}
rows.Add (data_row);
}
}
DataTable GetSchemaDataTable( SqliteCommand cmd, string[] restrictionValues )
{
if ( restrictionValues != null && cmd.Parameters.Count > 0 )
{
for ( int i = 0; i < restrictionValues.Length; i++ )
cmd.Parameters[i].Value = restrictionValues[i];
}
SqliteDataAdapter adapter = new SqliteDataAdapter( cmd );
DataTable dt = new DataTable();
adapter.Fill( dt );
return dt;
}
private void CreateNewCommand (ref SqliteCommand command)
{
SqliteCommand sourceCommand = SourceCommand;
if (command == null) {
command = sourceCommand.Connection.CreateCommand () as SqliteCommand;
command.CommandTimeout = sourceCommand.CommandTimeout;
command.Transaction = sourceCommand.Transaction;
}
command.CommandType = CommandType.Text;
command.UpdatedRowSource = UpdateRowSource.None;
command.Parameters.Clear ();
}
DataTable GetSchemaViews( string[] restrictionValues )
{
SqliteCommand cmd = new SqliteCommand(
"SELECT type, name, tbl_name, rootpage, sql " +
" FROM sqlite_master " +
" WHERE (name = :pname or :pname is null) " +
" AND type = 'view' " +
" ORDER BY name", this );
cmd.Parameters.Add( "pname", DbType.String ).Value = DBNull.Value;
return GetSchemaDataTable( cmd, restrictionValues );
}
