public SQLiteTransaction BeginTransaction()
{
if (mState != ConnectionState.Open)
{
throw new InvalidOperationException();
}
if (mpTrans != null)
{
throw new NotSupportedException();
}
return mpTrans = new SQLiteTransaction(this);
}
/// <summary>Starts a batch load/update of the store. Batching allows caching and can improve
/// performance.</summary>
public void BeginBatch()
{
if (_tx != null) {
throw new InvalidOperationException("Cannot call BeginBatch while a previous batch is still pending");
}
_tx = Connection.BeginTransaction();
}
public void EndBatch()
{
if (_tx == null) {
throw new InvalidOperationException("There is no outstanding batch on this thread");
}
_tx.Commit();
_tx.Dispose();
_tx = null;
}
/// <summary>
/// Create and prepare a SQLiteCommand, and call ExecuteReader with the appropriate CommandBehavior.
/// </summary>
/// <remarks>
/// If we created and opened the connection, we want the connection to be closed when the DataReader is closed.
///
/// If the caller provided the connection, we want to leave it to them to manage.
/// </remarks>
/// <param name="connection">A valid SQLiteConnection, on which to execute this command</param>
/// <param name="transaction">A valid SQLiteTransaction, or 'null'</param>
/// <param name="commandType">The CommandType (TableDirect, Text)</param>
/// <param name="commandText">The T-SQL command</param>
/// <param name="commandParameters">An array of SQLiteParameters to be associated with the command or 'null' if no parameters are required</param>
/// <param name="connectionOwnership">Indicates whether the connection parameter was provided by the caller, or created by SQLiteHelper</param>
/// <returns>SQLiteDataReader containing the results of the command</returns>
private static SQLiteDataReader ExecuteReader(SQLiteConnection connection, SQLiteTransaction transaction, CommandType commandType, string commandText, SQLiteParameter[] commandParameters, SQLiteConnectionOwnership connectionOwnership)
{
if( connection == null ) throw new ArgumentNullException( "connection" );
bool mustCloseConnection = false;
// Create a command and prepare it for execution
SQLiteCommand cmd = new SQLiteCommand();
try
{
PrepareCommand(cmd, connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection );
// Create a reader
SQLiteDataReader dataReader;
// Call ExecuteReader with the appropriate CommandBehavior
if (connectionOwnership == SQLiteConnectionOwnership.External)
{
dataReader = cmd.ExecuteReader();
}
else
{
dataReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
}
// Detach the SQLiteParameters from the command object, so they can be used again.
// HACK: There is a problem here, the output parameter values are fletched
// when the reader is closed, so if the parameters are detached from the command
// then the SQLiteReader can´t set its values.
// When this happen, the parameters can´t be used again in other command.
bool canClear = true;
foreach(SQLiteParameter commandParameter in cmd.Parameters)
{
if (commandParameter.Direction != ParameterDirection.Input)
canClear = false;
}
if (canClear)
{
cmd.Parameters.Clear();
}
return dataReader;
}
catch
{
if( mustCloseConnection )
connection.Close();
throw;
}
}
private void SetItemTitleWords(SQLiteTransaction tx, long catId, String title)
{
//Tokenize the title into lower-case 'words' based on the word breaking algorithm
//below, and store each word in the database along with its ordinal position in the
//title
String[] titleTokens = TokenizeTitle(title);
using (SQLiteCommand cmd = tx.Connection.CreateCommand()) {
cmd.Transaction = tx;
cmd.CommandType = CommandType.Text;
cmd.CommandText = "insert into catalog_item_title_words(catalog_item_id, ordinal, word_id) values(?, ?, ?)";
cmd.CreateAndAddUnnamedParameters();
cmd.Prepare();
for (int idx = 0; idx < titleTokens.Length; idx++) {
cmd.Parameters[0].Value = catId;
cmd.Parameters[1].Value = idx+1;
cmd.Parameters[2].Value = GetWordId(titleTokens[idx], true);
cmd.ExecuteNonQuery();
}
}
//Now, update the catalog-wide title word graph
//with information from this title
AddItemTitleToTitleWordGraph(catId, titleTokens);
}
/// <summary>
/// Execute a SQLiteCommand (that returns a resultset and takes no parameters) against the provided SQLiteTransaction.
/// </summary>
/// <remarks>
/// e.g.:
/// FillDataset(trans, CommandType.Text, "Select * from TableTransaction", ds, new string[] {"orders"});
/// </remarks>
/// <param name="transaction">A valid SQLiteTransaction</param>
/// <param name="commandType">The CommandType (TableDirect, Text)</param>
/// <param name="commandText">The T-SQL command</param>
/// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
/// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
/// by a user defined name (probably the actual table name)
/// </param>
public static void FillDataset(SQLiteTransaction transaction, CommandType commandType,
string commandText,
DataSet dataSet, string[] tableNames)
{
FillDataset (transaction, commandType, commandText, dataSet, tableNames, null);
}
/// <summary>
/// Execute a SQLiteCommand (that returns a resultset) against the specified SQLiteTransaction
/// using the provided parameters.
/// </summary>
/// <remarks>
/// e.g.:
/// FillDataset(trans, CommandType.Text, "Select * from TableTransaction where ProdId=?", ds, new string[] {"orders"}, new SQLiteParameter("@prodid", 24));
/// </remarks>
/// <param name="transaction">A valid SQLiteTransaction</param>
/// <param name="commandType">The CommandType (TableDirect, Text)</param>
/// <param name="commandText">The T-SQL command</param>
/// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
/// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
/// by a user defined name (probably the actual table name)
/// </param>
/// <param name="commandParameters">An array of SQLiteParamters used to execute the command</param>
public static void FillDataset(SQLiteTransaction transaction, CommandType commandType,
string commandText, DataSet dataSet, string[] tableNames,
params SQLiteParameter[] commandParameters)
{
FillDataset((SQLiteConnection)transaction.Connection, transaction, commandType, commandText, dataSet, tableNames, commandParameters);
}
/// <summary>
/// Execute a SQLiteCommand (that returns a resultset and takes no parameters) against the provided SQLiteTransaction.
/// </summary>
/// <remarks>
/// e.g.:
/// string r = ExecuteXmlReader(trans, CommandType.Text, "Select * from TableTransaction");
/// </remarks>
/// <param name="transaction">A valid SQLiteTransaction</param>
/// <param name="commandType">The CommandType (TableDirect, Text)</param>
/// <param name="commandText">The T-SQL command using "FOR XML AUTO"</param>
/// <returns>An string containing the resultset generated by the command</returns>
public static string ExecuteXml(SQLiteTransaction transaction, CommandType commandType, string commandText)
{
// Pass through the call providing null for the set of SQLiteParameters
return ExecuteXml(transaction, commandType, commandText, (SQLiteParameter[])null);
}
/// <summary>
/// Execute a SQLiteCommand (that returns a resultset) against the specified SQLiteTransaction
/// using the provided parameters.
/// </summary>
/// <remarks>
/// e.g.:
/// XmlReader r = ExecuteXmlReader(trans, CommandType.Text, "Select * from TableTransaction where ProdId=?", new SQLiteParameter("@prodid", 24));
/// </remarks>
/// <param name="transaction">A valid SQLiteTransaction</param>
/// <param name="commandType">The CommandType (TableDirect, Text)</param>
/// <param name="commandText">The T-SQL command using "FOR XML AUTO"</param>
/// <param name="commandParameters">An array of SQLiteParamters used to execute the command</param>
/// <returns>An XmlReader containing the resultset generated by the command</returns>
public static string ExecuteXml(SQLiteTransaction transaction, CommandType commandType, string commandText, params SQLiteParameter[] commandParameters)
{
if( transaction == null ) throw new ArgumentNullException( "transaction" );
if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
// // Create a command and prepare it for execution
SQLiteCommand cmd = new SQLiteCommand();
bool mustCloseConnection = false;
PrepareCommand(cmd, (SQLiteConnection)transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);
// Create the DataAdapter & DataSet
SQLiteDataAdapter obj_Adapter =new SQLiteDataAdapter (cmd);
DataSet ds=new DataSet();
ds.Locale =CultureInfo.InvariantCulture;
obj_Adapter.Fill(ds);
// Detach the SQLiteParameters from the command object, so they can be used again
cmd.Parameters.Clear();
string retval= ds.GetXml();
ds.Clear();
obj_Adapter.Dispose ();
return retval;
}
/// <summary>
/// Execute a SQLiteCommand (that returns a 1x1 resultset) against the specified SQLiteTransaction
/// using the provided parameters.
/// </summary>
/// <remarks>
/// e.g.:
/// int orderCount = (int)ExecuteScalar(trans, CommandType.Text, "Select count(Order) from TableTransaction where ProdId=?", new SQLiteParameter("@prodid", 24));
/// </remarks>
/// <param name="transaction">A valid SQLiteTransaction</param>
/// <param name="commandType">The CommandType (TableDirect, Text)</param>
/// <param name="commandText">The T-SQL command</param>
/// <param name="commandParameters">An array of SQLiteParamters used to execute the command</param>
/// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
public static object ExecuteScalar(SQLiteTransaction transaction, CommandType commandType, string commandText, params SQLiteParameter[] commandParameters)
{
if( transaction == null ) throw new ArgumentNullException( "transaction" );
if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
// Create a command and prepare it for execution
SQLiteCommand cmd = new SQLiteCommand();
bool mustCloseConnection = false;
PrepareCommand(cmd, (SQLiteConnection)transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);
// Execute the command & return the results
object retval = cmd.ExecuteScalar();
// Detach the SQLiteParameters from the command object, so they can be used again
cmd.Parameters.Clear();
return retval;
}
/// <summary>
/// Execute a SQLiteCommand (that returns a resultset) against the specified SQLiteTransaction
/// using the provided parameters.
/// </summary>
/// <remarks>
/// e.g.:
/// SQLiteDataReader dr = ExecuteReader(trans, CommandType.Text, "Select Orderid from TableTransaction where ProdId=?", new SQLiteParameter("@prodid", 24));
/// </remarks>
/// <param name="transaction">A valid SQLiteTransaction</param>
/// <param name="commandType">The CommandType (TableDirect, Text)</param>
/// <param name="commandText">The T-SQL command</param>
/// <param name="commandParameters">An array of SQLiteParamters used to execute the command</param>
/// <returns>A SQLiteDataReader containing the resultset generated by the command</returns>
public static SQLiteDataReader ExecuteReader(SQLiteTransaction transaction, CommandType commandType, string commandText, params SQLiteParameter[] commandParameters)
{
if( transaction == null ) throw new ArgumentNullException( "transaction" );
if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
// Pass through to private overload, indicating that the connection is owned by the caller
return ExecuteReader((SQLiteConnection)transaction.Connection, transaction, commandType, commandText, commandParameters, SQLiteConnectionOwnership.External);
}
/// <summary>
/// Execute a SQLiteCommand (that returns a resultset) against the specified SQLiteTransaction
/// using the provided parameters.
/// </summary>
/// <remarks>
/// e.g.:
/// DataSet ds = ExecuteDataset(trans, CommandType.Text, "Select * from TableTransaction where ProdId=?", new SQLiteParameter("@prodid", 24));
/// </remarks>
/// <param name="transaction">A valid SQLiteTransaction</param>
/// <param name="commandType">The CommandType (TableDirect, Text)</param>
/// <param name="commandText">The T-SQL command</param>
/// <param name="commandParameters">An array of SQLiteParamters used to execute the command</param>
/// <returns>A dataset containing the resultset generated by the command</returns>
public static DataSet ExecuteDataset(SQLiteTransaction transaction, CommandType commandType, string commandText, params SQLiteParameter[] commandParameters)
{
if( transaction == null ) throw new ArgumentNullException( "transaction" );
if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
// Create a command and prepare it for execution
SQLiteCommand cmd = new SQLiteCommand();
bool mustCloseConnection = false;
PrepareCommand(cmd, (SQLiteConnection)transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);
// Create the DataAdapter & DataSet
//using( SQLiteDataAdapter da = new SQLiteDataAdapter(cmd) )
SQLiteDataAdapter da = new SQLiteDataAdapter(cmd);
DataSet ds = new DataSet();
ds.Locale =CultureInfo.InvariantCulture;
// Fill the DataSet using default values for DataTable names, etc
da.Fill(ds);
// Detach the SQLiteParameters from the command object, so they can be used again
cmd.Parameters.Clear();
// Return the dataset
return ds;
}
/// <summary>
/// This method opens (if necessary) and assigns a connection, transaction, command type and parameters
/// to the provided command
/// </summary>
/// <param name="command">The SQLiteCommand to be prepared</param>
/// <param name="connection">A valid SQLiteConnection, on which to execute this command</param>
/// <param name="transaction">A valid SQLiteTransaction, or 'null'</param>
/// <param name="commandType">The CommandType (TableDirect, Text)</param>
/// <param name="commandText">The T-SQL command</param>
/// <param name="commandParameters">An array of SQLiteParameters to be associated with the command or 'null' if no parameters are required</param>
/// <param name="mustCloseConnection"><c>true</c> if the connection was opened by the method, otherwose is false.</param>
private static void PrepareCommand(SQLiteCommand command, SQLiteConnection connection, SQLiteTransaction transaction, CommandType commandType, string commandText, SQLiteParameter[] commandParameters, out bool mustCloseConnection )
{
if( command == null ) throw new ArgumentNullException( "command" );
if(commandType == CommandType.StoredProcedure ) throw new ArgumentException("Stored Procedures are not supported.");
// If the provided connection is not open, we will open it
if (connection.State != ConnectionState.Open)
{
mustCloseConnection = true;
connection.Open();
}
else
{
mustCloseConnection = false;
}
// Associate the connection with the command
command.Connection = connection;
// Set the command text (SQL statement)
command.CommandText = commandText;
// If we were provided a transaction, assign it
if (transaction != null)
{
if( transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
command.Transaction = transaction;
}
// Set the command type
command.CommandType = commandType;
// Attach the command parameters if they are provided
if (commandParameters != null)
{
AttachParameters(command, commandParameters);
}
return;
}
/// <summary>
/// Private helper method that execute a SQLiteCommand (that returns a resultset) against the specified SQLiteTransaction and SQLiteConnection
/// using the provided parameters.
/// </summary>
/// <remarks>
/// e.g.:
/// FillDataset(conn, trans, CommandType.Text, "Select * from TableTransaction where ProdId=?", ds, new string[] {"orders"}, new SQLiteParameter("@prodid", 24));
/// </remarks>
/// <param name="connection">A valid SQLiteConnection</param>
/// <param name="transaction">A valid SQLiteTransaction</param>
/// <param name="commandType">The CommandType (TableDirect, Text)</param>
/// <param name="commandText">The T-SQL command</param>
/// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
/// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
/// by a user defined name (probably the actual table name)
/// </param>
/// <param name="commandParameters">An array of SQLiteParamters used to execute the command</param>
private static void FillDataset(SQLiteConnection connection, SQLiteTransaction transaction, CommandType commandType,
string commandText, DataSet dataSet, string[] tableNames,
params SQLiteParameter[] commandParameters)
{
if( connection == null ) throw new ArgumentNullException( "connection" );
if( dataSet == null ) throw new ArgumentNullException( "dataSet" );
// Create a command and prepare it for execution
SQLiteCommand command = new SQLiteCommand();
bool mustCloseConnection = false;
PrepareCommand(command, connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection );
// Create the DataAdapter & DataSet
SQLiteDataAdapter dataAdapter = new SQLiteDataAdapter(command);
try
{
// Add the table mappings specified by the user
if (tableNames != null && tableNames.Length > 0)
{
string tableName = "Table";
for (int index=0; index < tableNames.Length; index++)
{
if( tableNames[index] == null || tableNames[index].Length == 0 ) throw new ArgumentException( "The tableNames parameter must contain a list of tables, a value was provided as null or empty string.", "tableNames" );
dataAdapter.TableMappings.Add(tableName, tableNames[index]);
tableName += (index + 1).ToString();
}
}
// Fill the DataSet using default values for DataTable names, etc
dataAdapter.Fill(dataSet);
// Detach the SQLiteParameters from the command object, so they can be used again
command.Parameters.Clear();
if( mustCloseConnection )
connection.Close();
}
finally
{
dataAdapter.Dispose();
}
}
