public T ExecuteScalar <T>()
{
if (_conn.Trace)
{
Debug.WriteLine("Executing Query: " + this);
}
T val = default(T);
IntPtr stmt = Prepare();
try {
SQLite3.Result r = SQLite3.Step(stmt);
if (r == SQLite3.Result.Row)
{
SQLite3.ColType colType = SQLite3.ColumnType(stmt, 0);
val = (T)ReadCol(stmt, 0, colType, typeof(T));
}
else if (r == SQLite3.Result.Done)
{
}
else
{
throw SQLiteException.New(r, SQLite3.GetErrmsg(_conn.Handle));
}
} finally {
Finalize(stmt);
}
return(val);
}
public int ExecuteNonQuery()
{
if (_conn.Trace)
{
Debug.WriteLine("Executing: " + this);
}
SQLite3.Result r = SQLite3.Result.OK;
IntPtr stmt = Prepare();
r = SQLite3.Step(stmt);
Finalize(stmt);
if (r == SQLite3.Result.Done)
{
int rowsAffected = SQLite3.Changes(_conn.Handle);
return(rowsAffected);
}
if (r == SQLite3.Result.Error)
{
string msg = SQLite3.GetErrmsg(_conn.Handle);
throw SQLiteException.New(r, msg);
}
if (r == SQLite3.Result.Constraint)
{
if (SQLite3.ExtendedErrCode(_conn.Handle) == SQLite3.ExtendedResult.ConstraintNotNull)
{
throw NotNullConstraintViolationException.New(r, SQLite3.GetErrmsg(_conn.Handle));
}
}
throw SQLiteException.New(r, r.ToString());
}
public string SaveTransactionPoint()
{
int depth = Interlocked.Increment(ref TransactionDepth) - 1;
string retVal = "S" + Rand.Next(short.MaxValue) + "D" + depth;
try {
Execute("savepoint " + retVal);
} catch (Exception ex) {
SQLiteException sqlExp = ex as SQLiteException;
if (sqlExp != null)
{
switch (sqlExp.Result)
{
case SQLite3.Result.IOError:
case SQLite3.Result.Full:
case SQLite3.Result.Busy:
case SQLite3.Result.NoMem:
case SQLite3.Result.Interrupt:
RollbackTo(null, true);
break;
}
}
else
{
Interlocked.Decrement(ref TransactionDepth);
}
throw;
}
return(retVal);
}
public void BeginTransaction()
{
if (Interlocked.CompareExchange(ref TransactionDepth, 1, 0) == 0)
{
try {
Execute("begin transaction");
} catch (Exception ex) {
SQLiteException sqlExp = ex as SQLiteException;
if (sqlExp != null)
{
switch (sqlExp.Result)
{
case SQLite3.Result.IOError:
case SQLite3.Result.Full:
case SQLite3.Result.Busy:
case SQLite3.Result.NoMem:
case SQLite3.Result.Interrupt:
RollbackTo(null, true);
break;
}
}
else
{
Interlocked.Decrement(ref TransactionDepth);
}
throw;
}
}
else
{
throw new InvalidOperationException("Cannot begin a transaction while already in a transaction.");
}
}
public void EnableLoadExtension(int onoff)
{
SQLite3.Result r = SQLite3.EnableLoadExtension(this.Handle, onoff);
if (r != SQLite3.Result.OK)
{
string msg = SQLite3.GetErrmsg(this.Handle);
throw SQLiteException.New(r, msg);
}
}
public int ExecuteNonQuery(object[] source)
{
if (this.Connection.Trace)
{
Debug.WriteLine("Executing: " + this.CommandText);
}
SQLite3.Result r = SQLite3.Result.OK;
if (!this.Initialized)
{
this.Statement = Prepare();
this.Initialized = true;
}
//bind the values.
if (source != null)
{
for (int i = 0; i < source.Length; i++)
{
SQLiteCommand.BindParameter(this.Statement, i + 1, source[i], this.Connection.StoreDateTimeAsTicks);
}
}
r = SQLite3.Step(this.Statement);
if (r == SQLite3.Result.Done)
{
int rowsAffected = SQLite3.Changes(this.Connection.Handle);
SQLite3.Reset(this.Statement);
return(rowsAffected);
}
if (r == SQLite3.Result.Error)
{
string msg = SQLite3.GetErrmsg(this.Connection.Handle);
SQLite3.Reset(this.Statement);
throw SQLiteException.New(r, msg);
}
if (r == SQLite3.Result.Constraint &&
SQLite3.ExtendedErrCode(this.Connection.Handle) == SQLite3.ExtendedResult.ConstraintNotNull)
{
SQLite3.Reset(this.Statement);
throw NotNullConstraintViolationException.New(r, SQLite3.GetErrmsg(this.Connection.Handle));
}
SQLite3.Reset(this.Statement);
throw SQLiteException.New(r, r.ToString());
}
public SQLiteCommand CreateCommand(string cmdText, params object[] ps)
{
if (!Opened)
{
throw SQLiteException.New(SQLite3.Result.Error, "Cannot create commands from unopened database");
}
SQLiteCommand cmd = NewCommand();
cmd.CommandText = cmdText;
foreach (object o in ps)
{
cmd.Bind(o);
}
return(cmd);
}
public SQLiteConnection(string databasePath, string password, SQLiteOpenFlags openFlags,
bool storeDateTimeAsTicks = false)
{
if (string.IsNullOrEmpty(databasePath))
{
throw new ArgumentException("Must be specified", "databasePath");
}
DatabasePath = databasePath;
Sqlite3DatabaseHandle handle;
byte[] databasePathAsBytes = GetNullTerminatedUtf8(this.DatabasePath);
SQLite3.Result r = SQLite3.Open(databasePathAsBytes, out handle, (int)openFlags, IntPtr.Zero);
Handle = handle;
if (r != SQLite3.Result.OK)
{
throw SQLiteException.New(r,
string.Format("Could not open database file: {0} ({1})", this.DatabasePath, r));
}
if (!string.IsNullOrEmpty(password))
{
SQLite3.Result result = SQLite3.Key(handle, password, password.Length);
if (result != SQLite3.Result.OK)
{
throw SQLiteException.New(r,
string.Format("Could not open database file: {0} ({1})", this.DatabasePath, r));
}
}
Opened = true;
StoreDateTimeAsTicks = storeDateTimeAsTicks;
BusyTimeout = TimeSpan.FromSeconds(0.1);
}
public void Close()
{
if (Opened && this.Handle != NullHandle)
{
try {
if (Mappings != null)
{
foreach (TableMapping sqlInsertCommand in Mappings.Values)
{
sqlInsertCommand.Dispose();
}
}
SQLite3.Result r = SQLite3.Close(this.Handle);
if (r != SQLite3.Result.OK)
{
string msg = SQLite3.GetErrmsg(this.Handle);
throw SQLiteException.New(r, msg);
}
} finally {
this.Handle = NullHandle;
Opened = false;
}
}
}
private void Dispose(bool disposing)
{
if (Opened && NullHandle != Handle)
{
try {
if (null != Mappings)
{
foreach (var item in Mappings.Values)
{
item.Dispose();
}
}
SQLite3.Result r = SQLite3.Close(Handle);
if (r != SQLite3.Result.OK)
{
string msg = SQLite3.GetErrmsg(Handle);
throw SQLiteException.New(r, msg);
}
} finally {
Handle = NullHandle;
Opened = false;
}
}
}
public static NotNullConstraintViolationException New(SQLiteException exception, TableMapping mapping,
object obj)
{
return(new NotNullConstraintViolationException(exception.Result, exception.Message, mapping, obj));
}
