// Statement
public override Statement EmitStatement(EmitMode mode)
{
if (_shouldEmit)
{
Expression expression = new RestrictExpression((Expression)Nodes[0].EmitStatement(mode), (Expression)Nodes[1].EmitStatement(mode));
expression.Modifiers = Modifiers;
return(expression);
}
else
{
return(Nodes[0].EmitStatement(mode));
}
}
public override object InternalExecute(Program program, object[] arguments)
{
var tableVar = APIUtilities.ResolveTableVarName(program, (string)arguments[0]);
var identifyingKey = APIUtilities.FindIdentifyingKey(program, tableVar);
var keyValues = APIUtilities.GetKeyValues(program, identifyingKey, (string)arguments[1]);
var keyEqualExpression = Compiler.BuildKeyEqualExpression(program.Plan, String.Empty, "AKey", new Schema.RowType(identifyingKey.Columns).Columns, keyValues.DataType.Columns);
var tableVarExpression = new IdentifierExpression(tableVar.Name);
var restrictExpression = new RestrictExpression(tableVarExpression, keyEqualExpression);
var expression = new D4TextEmitter().Emit(restrictExpression);
var dataParams = new DataParams();
dataParams.Add(new DataParam("AKey", keyValues.DataType, Modifier.In, keyValues));
return(APIUtilities.EvaluateSingleton(program, expression, dataParams));
}
protected static Expression MergeRestrictCondition(Expression expression, Expression condition)
{
RestrictExpression restrictExpression;
if (expression is RestrictExpression)
{
restrictExpression = (RestrictExpression)expression;
}
else
{
restrictExpression = new RestrictExpression();
restrictExpression.Expression = expression;
}
if (restrictExpression.Condition == null)
{
restrictExpression.Condition = condition;
}
else
{
restrictExpression.Condition = new BinaryExpression(restrictExpression.Condition, Instructions.And, condition);
}
return(restrictExpression);
}
