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/********************************************************
* ADO.NET 2.0 Data Provider for SQLite Version 3.X
* Written by Robert Simpson (robert@blackcastlesoft.com)
*
* Released to the public domain, use at your own risk!
********************************************************/
namespace System.Data.SQLite
{
using System;
using System.Data;
using System.Data.Common;
using System.Collections.Generic;
using System.Globalization;
using System.Reflection;
/// <summary>
/// SQLite implementation of DbDataReader.
/// </summary>
public sealed class SQLiteDataReader : DbDataReader
{
/// <summary>
/// Underlying command this reader is attached to
/// </summary>
private SQLiteCommand _command;
/// <summary>
/// Index of the current statement in the command being processed
/// </summary>
private int _activeStatementIndex;
/// <summary>
/// Current statement being Read()
/// </summary>
private SQLiteStatement _activeStatement;
/// <summary>
/// State of the current statement being processed.
/// -1 = First Step() executed, so the first Read() will be ignored
/// 0 = Actively reading
/// 1 = Finished reading
/// 2 = Non-row-returning statement, no records
/// </summary>
private int _readingState;
/// <summary>
/// Number of records affected by the insert/update statements executed on the command
/// </summary>
private int _rowsAffected;
/// <summary>
/// Count of fields (columns) in the row-returning statement currently being processed
/// </summary>
private int _fieldCount;
/// <summary>
/// Datatypes of active fields (columns) in the current statement, used for type-restricting data
/// </summary>
private SQLiteType[] _fieldTypeArray;
/// <summary>
/// The behavior of the datareader
/// </summary>
private CommandBehavior _commandBehavior;
/// <summary>
/// If set, then dispose of the command object when the reader is finished
/// </summary>
internal bool _disposeCommand;
/// <summary>
/// An array of rowid's for the active statement if CommandBehavior.KeyInfo is specified
/// </summary>
private SQLiteKeyReader _keyInfo;
internal long _version; // Matches the version of the connection
/// <summary>
/// Internal constructor, initializes the datareader and sets up to begin executing statements
/// </summary>
/// <param name="cmd">The SQLiteCommand this data reader is for</param>
/// <param name="behave">The expected behavior of the data reader</param>
internal SQLiteDataReader(SQLiteCommand cmd, CommandBehavior behave)
{
_command = cmd;
_version = _command.Connection._version;
_commandBehavior = behave;
_activeStatementIndex = -1;
_rowsAffected = -1;
if (_command != null)
NextResult();
}
internal void Cancel()
{
_version = 0;
}
/// <summary>
/// Closes the datareader, potentially closing the connection as well if CommandBehavior.CloseConnection was specified.
/// </summary>
public override void Close()
{
try
{
if (_command != null)
{
try
{
try
{
// Make sure we've not been canceled
if (_version != 0)
{
try
{
while (NextResult())
{
}
}
catch(SQLiteException)
{
}
}
_command.ClearDataReader();
}
finally
{
// If the datareader's behavior includes closing the connection, then do so here.
if ((_commandBehavior & CommandBehavior.CloseConnection) != 0 && _command.Connection != null)
_command.Connection.Close();
}
}
finally
{
if (_disposeCommand)
_command.Dispose();
}
}
_command = null;
_activeStatement = null;
_fieldTypeArray = null;
}
finally
{
if (_keyInfo != null)
{
_keyInfo.Dispose();
_keyInfo = null;
}
}
}
/// <summary>
/// Throw an error if the datareader is closed
/// </summary>
private void CheckClosed()
{
if (_command == null)
throw new InvalidOperationException("DataReader has been closed");
if (_version == 0)
throw new SQLiteException((int)SQLiteErrorCode.Abort, "Execution was aborted by the user");
if (_command.Connection.State != ConnectionState.Open || _command.Connection._version != _version)
throw new InvalidOperationException("Connection was closed, statement was terminated");
}
/// <summary>
/// Throw an error if a row is not loaded
/// </summary>
private void CheckValidRow()
{
if (_readingState != 0)
throw new InvalidOperationException("No current row");
}
/// <summary>
/// Enumerator support
/// </summary>
/// <returns>Returns a DbEnumerator object.</returns>
public override Collections.IEnumerator GetEnumerator()
{
return new DbEnumerator(this, ((_commandBehavior & CommandBehavior.CloseConnection) == CommandBehavior.CloseConnection));
}
/// <summary>
/// Not implemented. Returns 0
/// </summary>
public override int Depth
{
get
{
CheckClosed();
return 0;
}
}
/// <summary>
/// Returns the number of columns in the current resultset
/// </summary>
public override int FieldCount
{
get
{
CheckClosed();
if (_keyInfo == null)
return _fieldCount;
return _fieldCount + _keyInfo.Count;
}
}
/// <summary>
/// Returns the number of visible fielsd in the current resultset
/// </summary>
public override int VisibleFieldCount
{
get
{
CheckClosed();
return _fieldCount;
}
}
/// <summary>
/// SQLite is inherently un-typed. All datatypes in SQLite are natively strings. The definition of the columns of a table
/// and the affinity of returned types are all we have to go on to type-restrict data in the reader.
///
/// This function attempts to verify that the type of data being requested of a column matches the datatype of the column. In
/// the case of columns that are not backed into a table definition, we attempt to match up the affinity of a column (int, double, string or blob)
/// to a set of known types that closely match that affinity. It's not an exact science, but its the best we can do.
/// </summary>
/// <returns>
/// This function throws an InvalidTypeCast() exception if the requested type doesn't match the column's definition or affinity.
/// </returns>
/// <param name="i">The index of the column to type-check</param>
/// <param name="typ">The type we want to get out of the column</param>
private TypeAffinity VerifyType(int i, DbType typ)
{
CheckClosed();
CheckValidRow();
TypeAffinity affinity = GetSQLiteType(i).Affinity;
switch (affinity)
{
case TypeAffinity.Int64:
if (typ == DbType.Int16) return affinity;
if (typ == DbType.Int32) return affinity;
if (typ == DbType.Int64) return affinity;
if (typ == DbType.Boolean) return affinity;
if (typ == DbType.Byte) return affinity;
if (typ == DbType.DateTime) return affinity;
if (typ == DbType.Single) return affinity;
if (typ == DbType.Double) return affinity;
if (typ == DbType.Decimal) return affinity;
break;
case TypeAffinity.Double:
if (typ == DbType.Single) return affinity;
if (typ == DbType.Double) return affinity;
if (typ == DbType.Decimal) return affinity;
if (typ == DbType.DateTime) return affinity;
break;
case TypeAffinity.Text:
if (typ == DbType.SByte) return affinity;
if (typ == DbType.String) return affinity;
if (typ == DbType.SByte) return affinity;
if (typ == DbType.Guid) return affinity;
if (typ == DbType.DateTime) return affinity;
if (typ == DbType.Decimal) return affinity;
break;
case TypeAffinity.Blob:
if (typ == DbType.Guid) return affinity;
if (typ == DbType.String) return affinity;
if (typ == DbType.Binary) return affinity;
break;
}
throw new InvalidCastException();
}
/// <summary>
/// Retrieves the column as a boolean value
/// </summary>
/// <param name="i">The index of the column to retrieve</param>
/// <returns>bool</returns>
public override bool GetBoolean(int i)
{
if (i >= VisibleFieldCount && _keyInfo != null)
return _keyInfo.GetBoolean(i - VisibleFieldCount);
VerifyType(i, DbType.Boolean);
return Convert.ToBoolean(GetValue(i), CultureInfo.CurrentCulture);
}
/// <summary>
/// Retrieves the column as a single byte value
/// </summary>
/// <param name="i">The index of the column to retrieve</param>
/// <returns>byte</returns>
public override byte GetByte(int i)
{
if (i >= VisibleFieldCount && _keyInfo != null)
return _keyInfo.GetByte(i - VisibleFieldCount);
VerifyType(i, DbType.Byte);
return Convert.ToByte(_activeStatement._sql.GetInt32(_activeStatement, i));
}
/// <summary>
/// Retrieves a column as an array of bytes (blob)
/// </summary>
/// <param name="i">The index of the column to retrieve</param>
/// <param name="fieldOffset">The zero-based index of where to begin reading the data</param>
/// <param name="buffer">The buffer to write the bytes into</param>
/// <param name="bufferoffset">The zero-based index of where to begin writing into the array</param>
/// <param name="length">The number of bytes to retrieve</param>
/// <returns>The actual number of bytes written into the array</returns>
/// <remarks>
/// To determine the number of bytes in the column, pass a null value for the buffer. The total length will be returned.
/// </remarks>
public override long GetBytes(int i, long fieldOffset, byte[] buffer, int bufferoffset, int length)
{
if (i >= VisibleFieldCount && _keyInfo != null)
return _keyInfo.GetBytes(i - VisibleFieldCount, fieldOffset, buffer, bufferoffset, length);
VerifyType(i, DbType.Binary);
return _activeStatement._sql.GetBytes(_activeStatement, i, (int)fieldOffset, buffer, bufferoffset, length);
}
/// <summary>
/// Returns the column as a single character
/// </summary>
/// <param name="i">The index of the column to retrieve</param>
/// <returns>char</returns>
public override char GetChar(int i)
{
if (i >= VisibleFieldCount && _keyInfo != null)
return _keyInfo.GetChar(i - VisibleFieldCount);
VerifyType(i, DbType.SByte);
return Convert.ToChar(_activeStatement._sql.GetInt32(_activeStatement, i));
}
/// <summary>
/// Retrieves a column as an array of chars (blob)
/// </summary>
/// <param name="i">The index of the column to retrieve</param>
/// <param name="fieldoffset">The zero-based index of where to begin reading the data</param>
/// <param name="buffer">The buffer to write the characters into</param>
/// <param name="bufferoffset">The zero-based index of where to begin writing into the array</param>
/// <param name="length">The number of bytes to retrieve</param>
/// <returns>The actual number of characters written into the array</returns>
/// <remarks>
/// To determine the number of characters in the column, pass a null value for the buffer. The total length will be returned.
/// </remarks>
public override long GetChars(int i, long fieldoffset, char[] buffer, int bufferoffset, int length)
{
if (i >= VisibleFieldCount && _keyInfo != null)
return _keyInfo.GetChars(i - VisibleFieldCount, fieldoffset, buffer, bufferoffset, length);
VerifyType(i, DbType.String);
return _activeStatement._sql.GetChars(_activeStatement, i, (int)fieldoffset, buffer, bufferoffset, length);
}
/// <summary>
/// Retrieves the name of the back-end datatype of the column
/// </summary>
/// <param name="i">The index of the column to retrieve</param>
/// <returns>string</returns>
public override string GetDataTypeName(int i)
{
if (i >= VisibleFieldCount && _keyInfo != null)
return _keyInfo.GetDataTypeName(i - VisibleFieldCount);
SQLiteType typ = GetSQLiteType(i);
if (typ.Type == DbType.Object) return SQLiteConvert.SQLiteTypeToType(typ).Name;
return _activeStatement._sql.ColumnType(_activeStatement, i, out typ.Affinity);
}
/// <summary>
/// Retrieve the column as a date/time value
/// </summary>
/// <param name="i">The index of the column to retrieve</param>
/// <returns>DateTime</returns>
public override DateTime GetDateTime(int i)
{
if (i >= VisibleFieldCount && _keyInfo != null)
return _keyInfo.GetDateTime(i - VisibleFieldCount);
VerifyType(i, DbType.DateTime);
return _activeStatement._sql.GetDateTime(_activeStatement, i);
}
/// <summary>
/// Retrieve the column as a decimal value
/// </summary>
/// <param name="i">The index of the column to retrieve</param>
/// <returns>decimal</returns>
public override decimal GetDecimal(int i)
{
if (i >= VisibleFieldCount && _keyInfo != null)
return _keyInfo.GetDecimal(i - VisibleFieldCount);
VerifyType(i, DbType.Decimal);
return Decimal.Parse(_activeStatement._sql.GetText(_activeStatement, i), NumberStyles.AllowDecimalPoint | NumberStyles.AllowExponent | NumberStyles.AllowLeadingSign, CultureInfo.InvariantCulture);
}
/// <summary>
/// Returns the column as a double
/// </summary>
/// <param name="i">The index of the column to retrieve</param>
/// <returns>double</returns>
public override double GetDouble(int i)
{
if (i >= VisibleFieldCount && _keyInfo != null)
return _keyInfo.GetDouble(i - VisibleFieldCount);
VerifyType(i, DbType.Double);
return _activeStatement._sql.GetDouble(_activeStatement, i);
}
/// <summary>
/// Returns the .NET type of a given column
/// </summary>
/// <param name="i">The index of the column to retrieve</param>
/// <returns>Type</returns>
public override Type GetFieldType(int i)
{
if (i >= VisibleFieldCount && _keyInfo != null)
return _keyInfo.GetFieldType(i - VisibleFieldCount);
return SQLiteConvert.SQLiteTypeToType(GetSQLiteType(i));
}
/// <summary>
/// Returns a column as a float value
/// </summary>
/// <param name="i">The index of the column to retrieve</param>
/// <returns>float</returns>
public override float GetFloat(int i)
{
if (i >= VisibleFieldCount && _keyInfo != null)
return _keyInfo.GetFloat(i - VisibleFieldCount);
VerifyType(i, DbType.Single);
return Convert.ToSingle(_activeStatement._sql.GetDouble(_activeStatement, i));
}
/// <summary>
/// Returns the column as a Guid
/// </summary>
/// <param name="i">The index of the column to retrieve</param>
/// <returns>Guid</returns>
public override Guid GetGuid(int i)
{
if (i >= VisibleFieldCount && _keyInfo != null)
return _keyInfo.GetGuid(i - VisibleFieldCount);
TypeAffinity affinity = VerifyType(i, DbType.Guid);
if (affinity == TypeAffinity.Blob)
{
byte[] buffer = new byte[16];
_activeStatement._sql.GetBytes(_activeStatement, i, 0, buffer, 0, 16);
return new Guid(buffer);
}
else
return new Guid(_activeStatement._sql.GetText(_activeStatement, i));
}
/// <summary>
/// Returns the column as a short
/// </summary>
/// <param name="i">The index of the column to retrieve</param>
/// <returns>Int16</returns>
public override Int16 GetInt16(int i)
{
if (i >= VisibleFieldCount && _keyInfo != null)
return _keyInfo.GetInt16(i - VisibleFieldCount);
VerifyType(i, DbType.Int16);
return Convert.ToInt16(_activeStatement._sql.GetInt32(_activeStatement, i));
}
/// <summary>
/// Retrieves the column as an int
/// </summary>
/// <param name="i">The index of the column to retrieve</param>
/// <returns>Int32</returns>
public override Int32 GetInt32(int i)
{
if (i >= VisibleFieldCount && _keyInfo != null)
return _keyInfo.GetInt32(i - VisibleFieldCount);
VerifyType(i, DbType.Int32);
return _activeStatement._sql.GetInt32(_activeStatement, i);
}
/// <summary>
/// Retrieves the column as a long
/// </summary>
/// <param name="i">The index of the column to retrieve</param>
/// <returns>Int64</returns>
public override Int64 GetInt64(int i)
{
if (i >= VisibleFieldCount && _keyInfo != null)
return _keyInfo.GetInt64(i - VisibleFieldCount);
VerifyType(i, DbType.Int64);
return _activeStatement._sql.GetInt64(_activeStatement, i);
}
/// <summary>
/// Retrieves the name of the column
/// </summary>
/// <param name="i">The index of the column to retrieve</param>
/// <returns>string</returns>
public override string GetName(int i)
{
if (i >= VisibleFieldCount && _keyInfo != null)
return _keyInfo.GetName(i - VisibleFieldCount);
return _activeStatement._sql.ColumnName(_activeStatement, i);
}
/// <summary>
/// Retrieves the i of a column, given its name
/// </summary>
/// <param name="name">The name of the column to retrieve</param>
/// <returns>The int i of the column</returns>
public override int GetOrdinal(string name)
{
CheckClosed();
int r = _activeStatement._sql.ColumnIndex(_activeStatement, name);
if (r == -1 && _keyInfo != null)
{
r = _keyInfo.GetOrdinal(name);
if (r > -1) r += VisibleFieldCount;
}
return r;
}
/// <summary>
/// Schema information in SQLite is difficult to map into .NET conventions, so a lot of work must be done
/// to gather the necessary information so it can be represented in an ADO.NET manner.
/// </summary>
/// <returns>Returns a DataTable containing the schema information for the active SELECT statement being processed.</returns>
public override DataTable GetSchemaTable()
{
return GetSchemaTable(true, false);
}
internal DataTable GetSchemaTable(bool wantUniqueInfo, bool wantDefaultValue)
{
CheckClosed();
DataTable tbl = new DataTable("SchemaTable");
DataTable tblIndexes = null;
DataTable tblIndexColumns;
DataRow row;
string temp;
string strCatalog = "";
string strTable = "";
string strColumn = "";
tbl.Locale = CultureInfo.InvariantCulture;
tbl.Columns.Add(SchemaTableColumn.ColumnName, typeof(String));
tbl.Columns.Add(SchemaTableColumn.ColumnOrdinal, typeof(int));
tbl.Columns.Add(SchemaTableColumn.ColumnSize, typeof(int));
tbl.Columns.Add(SchemaTableColumn.NumericPrecision, typeof(short));
tbl.Columns.Add(SchemaTableColumn.NumericScale, typeof(short));
tbl.Columns.Add(SchemaTableColumn.IsUnique, typeof(Boolean));
tbl.Columns.Add(SchemaTableColumn.IsKey, typeof(Boolean));
tbl.Columns.Add(SchemaTableOptionalColumn.BaseServerName, typeof(string));
tbl.Columns.Add(SchemaTableOptionalColumn.BaseCatalogName, typeof(String));
tbl.Columns.Add(SchemaTableColumn.BaseColumnName, typeof(String));
tbl.Columns.Add(SchemaTableColumn.BaseSchemaName, typeof(String));
tbl.Columns.Add(SchemaTableColumn.BaseTableName, typeof(String));
tbl.Columns.Add(SchemaTableColumn.DataType, typeof(Type));
tbl.Columns.Add(SchemaTableColumn.AllowDBNull, typeof(Boolean));
tbl.Columns.Add(SchemaTableColumn.ProviderType, typeof(int));
tbl.Columns.Add(SchemaTableColumn.IsAliased, typeof(Boolean));
tbl.Columns.Add(SchemaTableColumn.IsExpression, typeof(Boolean));
tbl.Columns.Add(SchemaTableOptionalColumn.IsAutoIncrement, typeof(Boolean));
tbl.Columns.Add(SchemaTableOptionalColumn.IsRowVersion, typeof(Boolean));
tbl.Columns.Add(SchemaTableOptionalColumn.IsHidden, typeof(Boolean));
tbl.Columns.Add(SchemaTableColumn.IsLong, typeof(Boolean));
tbl.Columns.Add(SchemaTableOptionalColumn.IsReadOnly, typeof(Boolean));
tbl.Columns.Add(SchemaTableOptionalColumn.ProviderSpecificDataType, typeof(Type));
tbl.Columns.Add(SchemaTableOptionalColumn.DefaultValue, typeof(object));
tbl.Columns.Add("DataTypeName", typeof(string));
tbl.Columns.Add("CollationType", typeof(string));
tbl.BeginLoadData();
for (int n = 0; n < _fieldCount; n++)
{
row = tbl.NewRow();
DbType typ = GetSQLiteType(n).Type;
// Default settings for the column
row[SchemaTableColumn.ColumnName] = GetName(n);
row[SchemaTableColumn.ColumnOrdinal] = n;
row[SchemaTableColumn.ColumnSize] = SQLiteConvert.DbTypeToColumnSize(typ);
row[SchemaTableColumn.NumericPrecision] = SQLiteConvert.DbTypeToNumericPrecision(typ);
row[SchemaTableColumn.NumericScale] = SQLiteConvert.DbTypeToNumericScale(typ);
row[SchemaTableColumn.ProviderType] = GetSQLiteType(n).Type;
row[SchemaTableColumn.IsLong] = false;
row[SchemaTableColumn.AllowDBNull] = true;
row[SchemaTableOptionalColumn.IsReadOnly] = false;
row[SchemaTableOptionalColumn.IsRowVersion] = false;
row[SchemaTableColumn.IsUnique] = false;
row[SchemaTableColumn.IsKey] = false;
row[SchemaTableOptionalColumn.IsAutoIncrement] = false;
row[SchemaTableColumn.DataType] = GetFieldType(n);
row[SchemaTableOptionalColumn.IsHidden] = false;
strColumn = _command.Connection._sql.ColumnOriginalName(_activeStatement, n);
if (String.IsNullOrEmpty(strColumn) == false) row[SchemaTableColumn.BaseColumnName] = strColumn;
row[SchemaTableColumn.IsExpression] = String.IsNullOrEmpty(strColumn);
row[SchemaTableColumn.IsAliased] = (String.Compare(GetName(n), strColumn, StringComparison.OrdinalIgnoreCase) != 0);
temp = _command.Connection._sql.ColumnTableName(_activeStatement, n);
if (String.IsNullOrEmpty(temp) == false) row[SchemaTableColumn.BaseTableName] = temp;
temp = _command.Connection._sql.ColumnDatabaseName(_activeStatement, n);
if (String.IsNullOrEmpty(temp) == false) row[SchemaTableOptionalColumn.BaseCatalogName] = temp;
string dataType = null;
// If we have a table-bound column, extract the extra information from it
if (String.IsNullOrEmpty(strColumn) == false)
{
string collSeq;
bool bNotNull;
bool bPrimaryKey;
bool bAutoIncrement;
string[] arSize;
// Get the column meta data
_command.Connection._sql.ColumnMetaData(
(string)row[SchemaTableOptionalColumn.BaseCatalogName],
(string)row[SchemaTableColumn.BaseTableName],
strColumn,
out dataType, out collSeq, out bNotNull, out bPrimaryKey, out bAutoIncrement);
if (bNotNull || bPrimaryKey) row[SchemaTableColumn.AllowDBNull] = false;
row[SchemaTableColumn.IsKey] = bPrimaryKey;
row[SchemaTableOptionalColumn.IsAutoIncrement] = bAutoIncrement;
row["CollationType"] = collSeq;
// For types like varchar(50) and such, extract the size
arSize = dataType.Split('(');
if (arSize.Length > 1)
{
dataType = arSize[0];
arSize = arSize[1].Split(')');
if (arSize.Length > 1)
{
arSize = arSize[0].Split(',', '.');
if (GetSQLiteType(n).Type == DbType.String || GetSQLiteType(n).Type == DbType.Binary)
{
row[SchemaTableColumn.ColumnSize] = Convert.ToInt32(arSize[0], CultureInfo.InvariantCulture);
}
else
{
row[SchemaTableColumn.NumericPrecision] = Convert.ToInt32(arSize[0], CultureInfo.InvariantCulture);
if (arSize.Length > 1)
row[SchemaTableColumn.NumericScale] = Convert.ToInt32(arSize[1], CultureInfo.InvariantCulture);
}
}
}
if (wantDefaultValue)
{
// Determine the default value for the column, which sucks because we have to query the schema for each column
using (SQLiteCommand cmdTable = new SQLiteCommand(String.Format(CultureInfo.InvariantCulture, "PRAGMA [{0}].TABLE_INFO([{1}])",
row[SchemaTableOptionalColumn.BaseCatalogName],
row[SchemaTableColumn.BaseTableName]
), _command.Connection))
using (DbDataReader rdTable = cmdTable.ExecuteReader())
{
// Find the matching column
while (rdTable.Read())
{
if (String.Compare((string)row[SchemaTableColumn.BaseColumnName], rdTable.GetString(1), StringComparison.OrdinalIgnoreCase) == 0)
{
if (rdTable.IsDBNull(4) == false)
row[SchemaTableOptionalColumn.DefaultValue] = rdTable[4];
break;
}
}
}
}
// Determine IsUnique properly, which is a pain in the butt!
if (wantUniqueInfo)
{
if ((string)row[SchemaTableOptionalColumn.BaseCatalogName] != strCatalog
|| (string)row[SchemaTableColumn.BaseTableName] != strTable)
{
strCatalog = (string)row[SchemaTableOptionalColumn.BaseCatalogName];
strTable = (string)row[SchemaTableColumn.BaseTableName];
tblIndexes = _command.Connection.GetSchema("Indexes", new string[] {
(string)row[SchemaTableOptionalColumn.BaseCatalogName],
null,
(string)row[SchemaTableColumn.BaseTableName],
null });
}
foreach (DataRow rowIndexes in tblIndexes.Rows)
{
tblIndexColumns = _command.Connection.GetSchema("IndexColumns", new string[] {
(string)row[SchemaTableOptionalColumn.BaseCatalogName],
null,
(string)row[SchemaTableColumn.BaseTableName],
(string)rowIndexes["INDEX_NAME"],
null
});
foreach (DataRow rowColumnIndex in tblIndexColumns.Rows)
{
if (String.Compare((string)rowColumnIndex["COLUMN_NAME"], strColumn, StringComparison.OrdinalIgnoreCase) == 0)
{
if (tblIndexColumns.Rows.Count == 1 && (bool)row[SchemaTableColumn.AllowDBNull] == false)
row[SchemaTableColumn.IsUnique] = rowIndexes["UNIQUE"];
// If its an integer primary key and the only primary key in the table, then its a rowid alias and is autoincrement
// NOTE: Currently commented out because this is not always the desired behavior. For example, a 1:1 relationship with
// another table, where the other table is autoincrement, but this one is not, and uses the rowid from the other.
// It is safer to only set Autoincrement on tables where we're SURE the user specified AUTOINCREMENT, even if its a rowid column.
if (tblIndexColumns.Rows.Count == 1 && (bool)rowIndexes["PRIMARY_KEY"] == true && String.IsNullOrEmpty(dataType) == false &&
String.Compare(dataType, "integer", StringComparison.OrdinalIgnoreCase) == 0)
{
// row[SchemaTableOptionalColumn.IsAutoIncrement] = true;
}
break;
}
}
}
}
if (String.IsNullOrEmpty(dataType))
{
TypeAffinity affin;
dataType = _activeStatement._sql.ColumnType(_activeStatement, n, out affin);
}
if (String.IsNullOrEmpty(dataType) == false)
row["DataTypeName"] = dataType;
}
tbl.Rows.Add(row);
}
if (_keyInfo != null)
_keyInfo.AppendSchemaTable(tbl);
tbl.AcceptChanges();
tbl.EndLoadData();
return tbl;
}
/// <summary>
/// Retrieves the column as a string
/// </summary>
/// <param name="i">The index of the column to retrieve</param>
/// <returns>string</returns>
public override string GetString(int i)
{
if (i >= VisibleFieldCount && _keyInfo != null)
return _keyInfo.GetString(i - VisibleFieldCount);
VerifyType(i, DbType.String);
return _activeStatement._sql.GetText(_activeStatement, i);
}
/// <summary>
/// Retrieves the column as an object corresponding to the underlying datatype of the column
/// </summary>
/// <param name="i">The index of the column to retrieve</param>
/// <returns>object</returns>
public override object GetValue(int i)
{
if (i >= VisibleFieldCount && _keyInfo != null)
return _keyInfo.GetValue(i - VisibleFieldCount);
SQLiteType typ = GetSQLiteType(i);
return _activeStatement._sql.GetValue(_activeStatement, i, typ);
}
/// <summary>
/// Retreives the values of multiple columns, up to the size of the supplied array
/// </summary>
/// <param name="values">The array to fill with values from the columns in the current resultset</param>
/// <returns>The number of columns retrieved</returns>
public override int GetValues(object[] values)
{
int nMax = FieldCount;
if (values.Length < nMax) nMax = values.Length;
for (int n = 0; n < nMax; n++)
{
values[n] = GetValue(n);
}
return nMax;
}
/// <summary>
/// Returns True if the resultset has rows that can be fetched
/// </summary>
public override bool HasRows
{
get
{
CheckClosed();
return (_readingState != 1);
}
}
/// <summary>
/// Returns True if the data reader is closed
/// </summary>
public override bool IsClosed
{
get { return (_command == null); }
}
/// <summary>
/// Returns True if the specified column is null
/// </summary>
/// <param name="i">The index of the column to retrieve</param>
/// <returns>True or False</returns>
public override bool IsDBNull(int i)
{
if (i >= VisibleFieldCount && _keyInfo != null)
return _keyInfo.IsDBNull(i - VisibleFieldCount);
return _activeStatement._sql.IsNull(_activeStatement, i);
}
/// <summary>
/// Moves to the next resultset in multiple row-returning SQL command.
/// </summary>
/// <returns>True if the command was successful and a new resultset is available, False otherwise.</returns>
public override bool NextResult()
{
CheckClosed();
SQLiteStatement stmt = null;
int fieldCount;
while (true)
{
if (_activeStatement != null && stmt == null)
{
// Reset the previously-executed statement
_activeStatement._sql.Reset(_activeStatement);
// If we're only supposed to return a single rowset, step through all remaining statements once until
// they are all done and return false to indicate no more resultsets exist.
if ((_commandBehavior & CommandBehavior.SingleResult) != 0)
{
for (; ; )
{
stmt = _command.GetStatement(_activeStatementIndex + 1);
if (stmt == null) break;
_activeStatementIndex++;
stmt._sql.Step(stmt);
if (stmt._sql.ColumnCount(stmt) == 0)
{
if (_rowsAffected == -1) _rowsAffected = 0;
_rowsAffected += stmt._sql.Changes;
}
stmt._sql.Reset(stmt); // Gotta reset after every step to release any locks and such!
}
return false;
}
}
// Get the next statement to execute
stmt = _command.GetStatement(_activeStatementIndex + 1);
// If we've reached the end of the statements, return false, no more resultsets
if (stmt == null)
return false;
// If we were on a current resultset, set the state to "done reading" for it
if (_readingState < 1)
_readingState = 1;
_activeStatementIndex++;
fieldCount = stmt._sql.ColumnCount(stmt);
// If the statement is not a select statement or we're not retrieving schema only, then perform the initial step
if ((_commandBehavior & CommandBehavior.SchemaOnly) == 0 || fieldCount == 0)
{
if (stmt._sql.Step(stmt))
{
_readingState = -1;
}
else if (fieldCount == 0) // No rows returned, if fieldCount is zero, skip to the next statement
{
if (_rowsAffected == -1) _rowsAffected = 0;
_rowsAffected += stmt._sql.Changes;
stmt._sql.Reset(stmt);
continue; // Skip this command and move to the next, it was not a row-returning resultset
}
else // No rows, fieldCount is non-zero so stop here
{
_readingState = 1; // This command returned columns but no rows, so return true, but HasRows = false and Read() returns false
}
}
// Ahh, we found a row-returning resultset eligible to be returned!
_activeStatement = stmt;
_fieldCount = fieldCount;
_fieldTypeArray = null;
if ((_commandBehavior & CommandBehavior.KeyInfo) != 0)
LoadKeyInfo();
return true;
}
}
/// <summary>
/// Retrieves the SQLiteType for a given column, and caches it to avoid repetetive interop calls.
/// </summary>
/// <param name="i">The index of the column to retrieve</param>
/// <returns>A SQLiteType structure</returns>
private SQLiteType GetSQLiteType(int i)
{
SQLiteType typ;
// Initialize the field types array if not already initialized
if (_fieldTypeArray == null)
_fieldTypeArray = new SQLiteType[VisibleFieldCount];
// Initialize this column's field type instance
if (_fieldTypeArray[i] == null) _fieldTypeArray[i] = new SQLiteType();
typ = _fieldTypeArray[i];
// If not initialized, then fetch the declared column datatype and attempt to convert it
// to a known DbType.
if (typ.Affinity == TypeAffinity.Uninitialized)
typ.Type = SQLiteConvert.TypeNameToDbType(_activeStatement._sql.ColumnType(_activeStatement, i, out typ.Affinity));
else
typ.Affinity = _activeStatement._sql.ColumnAffinity(_activeStatement, i);
return typ;
}
/// <summary>
/// Reads the next row from the resultset
/// </summary>
/// <returns>True if a new row was successfully loaded and is ready for processing</returns>
public override bool Read()
{
CheckClosed();
if (_readingState == -1) // First step was already done at the NextResult() level, so don't step again, just return true.
{
_readingState = 0;
return true;
}
else if (_readingState == 0) // Actively reading rows
{
// Don't read a new row if the command behavior dictates SingleRow. We've already read the first row.
if ((_commandBehavior & CommandBehavior.SingleRow) == 0)
{
if (_activeStatement._sql.Step(_activeStatement) == true)
{
if (_keyInfo != null)
_keyInfo.Reset();
return true;
}
}
_readingState = 1; // Finished reading rows
}
return false;
}
/// <summary>
/// Retrieve the count of records affected by an update/insert command. Only valid once the data reader is closed!
/// </summary>
public override int RecordsAffected
{
get { return (_rowsAffected < 0) ? 0 : _rowsAffected; }
}
/// <summary>
/// Indexer to retrieve data from a column given its name
/// </summary>
/// <param name="name">The name of the column to retrieve data for</param>
/// <returns>The value contained in the column</returns>
public override object this[string name]
{
get { return GetValue(GetOrdinal(name)); }
}
/// <summary>
/// Indexer to retrieve data from a column given its i
/// </summary>
/// <param name="i">The index of the column to retrieve</param>
/// <returns>The value contained in the column</returns>
public override object this[int i]
{
get { return GetValue(i); }
}
private void LoadKeyInfo()
{
if (_keyInfo != null)
_keyInfo.Dispose();
_keyInfo = new SQLiteKeyReader(_command.Connection, this, _activeStatement);
}
}
}