public override string Generate(UseFederationExpression expression)
{
if (expression.UseRoot)
{
return Wrap(UseRoot);
}
string filter = string.Format(FederationFiltering, expression.Filtering ? "ON" : "OFF");
return Wrap(string.Format(UseFederation, expression.Name, expression.DistributionName, expression.DistributionValue ?? "1", filter));
}
public override string Generate(UseFederationExpression expression)
{
throw new NotSupportedException("Currently only Azure databases support data federation.");
}
public IUseFederationSyntax Federation(string name)
{
var expression = new UseFederationExpression { Name = name };
_context.Expressions.Add(expression);
return new UseFederationExpressionBuilder(expression, _context);
}
public void Process(ForEachFederationExpression expression)
{
UseFederationExpression useRootFederation = new UseFederationExpression {UseRoot = true};
Process (useRootFederation);
DataTable federations = Read(m_forEachFederationSql, expression.Federation).Tables[0];
foreach (DataRow row in federations.Rows)
{
string range = row["range_low"].ToString();
string distribution = row["distribution_name"].ToString();
UseFederationExpression useFederationExpression = new UseFederationExpression
{
DistributionName = distribution,
Name = expression.Federation,
DistributionValue = range
};
Process(useFederationExpression);
foreach (IMigrationExpression innerExpression in expression.Context.Expressions)
{
innerExpression.ExecuteWith (this);
}
}
}
public void Process(UseFederationExpression expression)
{
Process(Generator.Generate(expression));
}
public UseFederationExpressionBuilder(UseFederationExpression expression, IMigrationContext context)
{
_context = context;
_expression = expression;
}
