public override bool CanConnect(CancellationToken token)
{
bool canConnect;
InternalOracleConnection connection = null;
try
{
connection = new InternalOracleConnection(DbContext.ConnectionString);
canConnect = true;
}
catch
{
canConnect = false;
}
finally
{
if (connection != null)
{
connection.Dispose();
}
}
return(canConnect);
}
public OracleDataCursor(IDbContext dbContext)
{
_dbContext = dbContext;
_connection = null;
_command = null;
_reader = null;
RowPreFetch = 5000;
}
public InternalOracleCommand(string statement, InternalOracleConnection connection)
{
Command = new OracleCommand();
Command.CommandText = statement;
Command.CommandType = CommandType.Text;
Command.AddToStatementCache = false;
Command.InitialLONGFetchSize = 4000;
Command.InitialLOBFetchSize = 4000;
Command.Connection = connection.Connection;
}
public IDataReader ExecuteReader(string selectStatement, bool hasBlobColumn)
{
_connection = new InternalOracleConnection(_dbContext.ConnectionString);
_command = new InternalOracleCommand(selectStatement, _connection);
_reader = _command.Command.ExecuteReader();
if (_command.Command.RowSize > 0)
{
_reader.FetchSize = _command.Command.RowSize * RowPreFetch;
}
return(_reader);
}
public void Close()
{
if (_reader != null)
{
_reader.Dispose();
_reader = null;
}
if (_command != null)
{
_command.Dispose();
_command = null;
}
if (_connection != null)
{
_connection.Dispose();
_connection = null;
}
}
public override bool IsTable(string tableName)
{
bool tableExists;
var connection = new InternalOracleConnection(DbContext.ConnectionString);
try
{
using (var command = new InternalOracleCommand("SELECT table_name FROM user_tables WHERE table_name = :tableName ", connection))
{
command.Command.Parameters.Add(new OracleParameter("tableName", tableName.ToUpper()));
tableExists = command.Command.ExecuteScalar() != null;
}
}
catch (Exception ex)
{
throw new ADatabaseException("ERROR with statement in IsTable", ex);
}
finally
{
connection.Dispose();
}
return(tableExists);
}
public object ExecuteScalar(string sql)
{
InternalOracleConnection connection = null;
try
{
connection = new InternalOracleConnection(_dbContext.ConnectionString);
using (InternalOracleCommand command = new InternalOracleCommand(sql, connection))
{
return(command.Command.ExecuteScalar());
}
}
catch (Exception ex)
{
throw new ADatabaseException("ERROR with statement: " + sql, ex);
}
finally
{
if (connection != null)
{
connection.Dispose();
}
}
}
