/// <summary>
/// Set common parameters to SelectChanges Sql command
/// </summary>
internal void SetSelectChangesCommonParameters(SyncContext context, SyncTable syncTable, Guid?excludingScopeId, bool isNew, long?lastTimestamp, DbCommand selectIncrementalChangesCommand)
{
// Set the parameters
DbSyncAdapter.SetParameterValue(selectIncrementalChangesCommand, "sync_min_timestamp", lastTimestamp);
DbSyncAdapter.SetParameterValue(selectIncrementalChangesCommand, "sync_scope_id", excludingScopeId.HasValue ? (object)excludingScopeId.Value : DBNull.Value);
// Check filters
SyncFilter tableFilter = null;
// Sqlite does not have any filter, since he can't be server side
if (this.Provider.CanBeServerProvider)
{
tableFilter = syncTable.GetFilter();
}
var hasFilters = tableFilter != null;
if (!hasFilters)
{
return;
}
// context parameters can be null at some point.
var contexParameters = context.Parameters ?? new SyncParameters();
foreach (var filterParam in tableFilter.Parameters)
{
var parameter = contexParameters.FirstOrDefault(p =>
p.Name.Equals(filterParam.Name, SyncGlobalization.DataSourceStringComparison));
object val = parameter?.Value;
DbSyncAdapter.SetParameterValue(selectIncrementalChangesCommand, filterParam.Name, val);
}
}
/// <summary>
/// Set common parameters to SelectChanges Sql command
/// </summary>
private void SetSelectChangesCommonParameters(SyncContext context, SyncTable syncTable, Guid?excludingScopeId, bool isNew, long lastTimestamp, DbCommand selectIncrementalChangesCommand)
{
// Generate the isNewScope Flag.
var isNewScope = isNew ? 1 : 0;
var isReinit = context.SyncType == SyncType.Reinitialize ? 1 : 0;
switch (context.SyncWay)
{
case SyncWay.Upload:
// Overwrite if we are in Reinitialize mode (not RenitializeWithUpload)
isNewScope = context.SyncType == SyncType.Reinitialize ? 1 : isNewScope;
lastTimestamp = context.SyncType == SyncType.Reinitialize ? 0 : lastTimestamp;
isReinit = context.SyncType == SyncType.Reinitialize ? 1 : 0;
break;
case SyncWay.Download:
// Ovewrite on bot Reinitialize and ReinitializeWithUpload
isNewScope = context.SyncType != SyncType.Normal ? 1 : isNewScope;
lastTimestamp = context.SyncType != SyncType.Normal ? 0 : lastTimestamp;
isReinit = context.SyncType != SyncType.Normal ? 1 : 0;
break;
default:
break;
}
// Set the parameters
DbTableManagerFactory.SetParameterValue(selectIncrementalChangesCommand, "sync_min_timestamp", lastTimestamp);
DbTableManagerFactory.SetParameterValue(selectIncrementalChangesCommand, "sync_scope_id", excludingScopeId.HasValue ? (object)excludingScopeId.Value : DBNull.Value);
// Check filters
SyncFilter tableFilter = null;
// Sqlite does not have any filter, since he can't be server side
if (this.CanBeServerProvider)
{
tableFilter = syncTable.GetFilter();
}
var hasFilters = tableFilter != null;
if (!hasFilters)
{
return;
}
// context parameters can be null at some point.
var contexParameters = context.Parameters ?? new SyncParameters();
foreach (var filterParam in tableFilter.Parameters)
{
var parameter = contexParameters.FirstOrDefault(p =>
p.Name.Equals(filterParam.Name, SyncGlobalization.DataSourceStringComparison));
object val = parameter?.Value;
DbTableManagerFactory.SetParameterValue(selectIncrementalChangesCommand, filterParam.Name, val);
}
}
/// <summary>
/// Get the correct Select changes command
/// Can be either
/// - SelectInitializedChanges : All changes for first sync
/// - SelectChanges : All changes filtered by timestamp
/// - SelectInitializedChangesWithFilters : All changes for first sync with filters
/// - SelectChangesWithFilters : All changes filtered by timestamp with filters
/// </summary>
private async Task <DbCommand> GetSelectChangesCommandAsync(SyncContext context, DbSyncAdapter syncAdapter, SyncTable syncTable, bool isNew)
{
DbCommand selectIncrementalChangesCommand;
DbCommandType dbCommandType;
SyncFilter tableFilter = null;
// Check if we have parameters specified
// Sqlite does not have any filter, since he can't be server side
if (this.CanBeServerProvider)
{
tableFilter = syncTable.GetFilter();
}
var hasFilters = tableFilter != null;
// Determing the correct DbCommandType
if (isNew && hasFilters)
{
dbCommandType = DbCommandType.SelectInitializedChangesWithFilters;
}
else if (isNew && !hasFilters)
{
dbCommandType = DbCommandType.SelectInitializedChanges;
}
else if (!isNew && hasFilters)
{
dbCommandType = DbCommandType.SelectChangesWithFilters;
}
else
{
dbCommandType = DbCommandType.SelectChanges;
}
// Get correct Select incremental changes command
selectIncrementalChangesCommand = syncAdapter.GetCommand(dbCommandType, tableFilter);
if (selectIncrementalChangesCommand == null)
{
throw new MissingCommandException(dbCommandType.ToString());
}
// Add common parameters
await syncAdapter.SetCommandParametersAsync(dbCommandType, selectIncrementalChangesCommand, tableFilter);
return(selectIncrementalChangesCommand);
}
/// <summary>
/// Validates, that all column filters do refer to a an existing column of the target table
/// </summary>
/// <param name="filters"></param>
/// <param name="tableDescription"></param>
public static void ValidateColumnFilters(this SyncFilter filter, SyncTable tableDescription)
{
if (filter == null)
{
return;
}
// TODO : Validate column filters
//foreach (var c in filters)
//{
// if (c.IsVirtual)
// continue;
// var columnFilter = tableDescription.Columns[c.ColumnName];
// if (columnFilter == null)
// throw new InvalidExpressionException($"Column {c.ColumnName} does not exist in Table {tableDescription.TableName}");
//}
}
/// <summary>
/// Get the correct Select changes command
/// Can be either
/// - SelectInitializedChanges : All changes for first sync
/// - SelectChanges : All changes filtered by timestamp
/// - SelectInitializedChangesWithFilters : All changes for first sync with filters
/// - SelectChangesWithFilters : All changes filtered by timestamp with filters
/// </summary>
internal async Task <DbCommand> GetSelectChangesCommandAsync(SyncContext context, SyncTable syncTable, SyncSetup setup, bool isNew, DbConnection connection, DbTransaction transaction)
{
DbCommand command;
DbCommandType dbCommandType;
SyncFilter tableFilter = null;
var syncAdapter = this.GetSyncAdapter(syncTable, setup);
// Check if we have parameters specified
// Sqlite does not have any filter, since he can't be server side
if (this.Provider.CanBeServerProvider)
{
tableFilter = syncTable.GetFilter();
}
var hasFilters = tableFilter != null;
// Determing the correct DbCommandType
if (isNew && hasFilters)
{
dbCommandType = DbCommandType.SelectInitializedChangesWithFilters;
}
else if (isNew && !hasFilters)
{
dbCommandType = DbCommandType.SelectInitializedChanges;
}
else if (!isNew && hasFilters)
{
dbCommandType = DbCommandType.SelectChangesWithFilters;
}
else
{
dbCommandType = DbCommandType.SelectChanges;
}
// Get correct Select incremental changes command
command = await syncAdapter.GetCommandAsync(dbCommandType, connection, transaction, tableFilter);
return(command);
}
/// <summary> /// Set parameters on a command /// </summary> public abstract Task SetCommandParametersAsync(DbCommandType commandType, DbCommand command, SyncFilter filter = null);
/// <summary> /// Gets a command from the current adapter /// </summary> public abstract DbCommand GetCommand(DbCommandType commandType, SyncFilter filter = null);
/// <summary> /// Add parameters to a command /// </summary> public abstract Task AddCommandParametersAsync(DbCommandType commandType, DbCommand command, DbConnection connection, DbTransaction transaction, SyncFilter filter = null);
/// <summary> /// Gets a command from the current adapter /// </summary> public abstract (DbCommand Command, bool IsBatchCommand) GetCommand(DbCommandType commandType, SyncFilter filter = null);
/// <summary>
/// Get the command from provider, check connection is opened, affect connection and transaction
/// Prepare the command parameters and add scope parameters
/// </summary>
public async Task <(DbCommand Command, bool IsBatch)> GetCommandAsync(DbCommandType commandType, DbConnection connection, DbTransaction transaction, SyncFilter filter = null)
{
// Create the key
var commandKey = $"{connection.DataSource}-{connection.Database}-{this.TableDescription.GetFullName()}-{commandType}";
var(command, isBatch) = GetCommand(commandType, filter);
if (command == null)
{
return(null, false);
}
// Add Parameters
await this.AddCommandParametersAsync(commandType, command, connection, transaction, filter).ConfigureAwait(false);
if (command == null)
{
throw new MissingCommandException(commandType.ToString());
}
if (connection == null)
{
throw new MissingConnectionException();
}
if (connection.State != ConnectionState.Open)
{
throw new ConnectionClosedException(connection);
}
command.Connection = connection;
command.Transaction = transaction;
// Get a lazy command instance
var lazyCommand = commands.GetOrAdd(commandKey, k => new Lazy <SyncCommand>(() =>
{
var syncCommand = new SyncCommand(commandKey);
return(syncCommand);
}));
// lazyCommand.Metadata is a boolean indicating if the command is already prepared on the server
if (lazyCommand.Value.IsPrepared == true)
{
return(command, isBatch);
}
// Testing The Prepare() performance increase
command.Prepare();
// Adding this command as prepared
lazyCommand.Value.IsPrepared = true;
commands.AddOrUpdate(commandKey, lazyCommand, (key, lc) => new Lazy <SyncCommand>(() => lc.Value));
return(command, isBatch);
}
/// <summary>
/// Get the command from provider, check connection is opened, affect connection and transaction
/// Prepare the command parameters and add scope parameters
/// </summary>
internal async Task <DbCommand> PrepareCommandAsync(DbCommandType commandType, DbConnection connection, DbTransaction transaction, SyncFilter filter = null)
{
// Create the key
var commandKey = $"{connection.DataSource}-{connection.Database}-{this.TableDescription.GetFullName()}-{commandType}";
// Get a lazy command instance
var lazyCommand = commands.GetOrAdd(commandKey, k => new Lazy <DbCommand>(() => GetCommand(commandType, filter)));
// Get the concrete instance
var command = lazyCommand.Value;
if (command == null)
{
throw new MissingCommandException(commandType.ToString());
}
if (connection == null)
{
throw new MissingConnectionException();
}
if (connection.State != ConnectionState.Open)
{
throw new ConnectionClosedException(connection);
}
command.Connection = connection;
if (transaction != null)
{
command.Transaction = transaction;
}
// Add Parameters
await this.AddCommandParametersAsync(commandType, command, connection, transaction, filter).ConfigureAwait(false);
// Testing The Prepare() performance increase
command.Prepare();
return(command);
}
/// <summary> /// Set parameters on a command /// </summary> public abstract void SetCommandParameters(DbCommandType commandType, DbCommand command, SyncFilter filter = null);
