/// <summary>
/// Constructor
/// </summary>
/// <param name="manifestToken">A token used to infer the capabilities of the store</param>
public SampleProviderManifest(string manifestToken)
: base(SampleProviderManifest.GetProviderManifest())
{
// GetStoreVersion will throw ArgumentException if manifestToken is null, empty, or not recognized.
_version = StoreVersionUtils.GetStoreVersion(manifestToken);
_token = manifestToken;
}
/// <summary>
/// Create a SampleCommand object, given the provider manifest and command tree
/// </summary>
private DbCommand CreateCommand(DbProviderManifest manifest, DbCommandTree commandTree)
{
if (manifest == null)
{
throw new ArgumentNullException("manifest");
}
if (commandTree == null)
{
throw new ArgumentNullException("commandTree");
}
SampleProviderManifest sampleManifest = (manifest as SampleProviderManifest);
if (sampleManifest == null)
{
throw new ArgumentException("The provider manifest given is not of type 'SampleProviderManifest'.");
}
StoreVersion version = sampleManifest.Version;
SampleCommand command = new SampleCommand();
List <DbParameter> parameters;
CommandType commandType;
command.CommandText = SqlGenerator.GenerateSql(commandTree, version, out parameters, out commandType);
command.CommandType = commandType;
if (command.CommandType == CommandType.Text)
{
command.CommandText += Environment.NewLine + Environment.NewLine + "-- provider: " + this.GetType().Assembly.FullName;
}
// Get the function (if any) implemented by the command tree since this influences our interpretation of parameters
EdmFunction function = null;
if (commandTree is DbFunctionCommandTree)
{
function = ((DbFunctionCommandTree)commandTree).EdmFunction;
}
// Now make sure we populate the command's parameters from the CQT's parameters:
foreach (KeyValuePair <string, TypeUsage> queryParameter in commandTree.Parameters)
{
SqlParameter parameter;
// Use the corresponding function parameter TypeUsage where available (currently, the SSDL facets and
// type trump user-defined facets and type in the EntityCommand).
FunctionParameter functionParameter;
if (null != function && function.Parameters.TryGetValue(queryParameter.Key, false, out functionParameter))
{
parameter = CreateSqlParameter(functionParameter.Name, functionParameter.TypeUsage, functionParameter.Mode, DBNull.Value);
}
else
{
parameter = CreateSqlParameter(queryParameter.Key, queryParameter.Value, ParameterMode.In, DBNull.Value);
}
command.Parameters.Add(parameter);
}
// Now add parameters added as part of SQL gen (note: this feature is only safe for DML SQL gen which
// does not support user parameters, where there is no risk of name collision)
if (null != parameters && 0 < parameters.Count)
{
if (!(commandTree is DbInsertCommandTree) &&
!(commandTree is DbUpdateCommandTree) &&
!(commandTree is DbDeleteCommandTree))
{
throw new InvalidOperationException("SqlGenParametersNotPermitted");
}
foreach (DbParameter parameter in parameters)
{
command.Parameters.Add(parameter);
}
}
return(command);
}
/// <summary>
/// Escapes the wildcard characters and the escape character in the given argument.
/// </summary>
/// <param name="argument"></param>
/// <returns>Equivalent to the argument, with the wildcard characters and the escape character escaped</returns>
public override string EscapeLikeArgument(string argument)
{
bool usedEscapeCharacter;
return(SampleProviderManifest.EscapeLikeText(argument, true, out usedEscapeCharacter));
}
