protected override SqlStatement PrepareStatement(IRequest context)
{
var tableName = context.Access().ResolveTableName(TableName);
if (!context.Access().TableExists(tableName))
{
throw new ObjectNotFoundException(tableName);
}
var queryExpression = new SqlQueryExpression(new[] { SelectColumn.Glob("*") });
queryExpression.FromClause.AddTable(tableName.FullName);
queryExpression.WhereExpression = WherExpression;
var queryFrom = QueryExpressionFrom.Create(context, queryExpression);
var queryPlan = context.Query.Context.QueryPlanner().PlanQuery(new QueryInfo(context, queryExpression));
var columns = new List <SqlAssignExpression>();
foreach (var assignment in Assignments)
{
var columnName = ObjectName.Parse(assignment.ColumnName);
var refName = queryFrom.ResolveReference(columnName);
var expression = assignment.Expression.Prepare(queryFrom.ExpressionPreparer);
var assign = SqlExpression.Assign(SqlExpression.Reference(refName), expression);
columns.Add(assign);
}
return(new Prepared(tableName, queryPlan, columns.ToArray(), Limit));
}
IStatement IPreparableStatement.Prepare(IRequest context)
{
var viewName = context.Query.ResolveTableName(ViewName);
var queryFrom = QueryExpressionFrom.Create(context, QueryExpression);
var queryPlan = context.Query.Context.QueryPlanner().PlanQuery(new QueryInfo(context, QueryExpression));
var colList = ColumnNames == null ? new string[0] : ColumnNames.ToArray();
// Wrap the result around a SubsetNode to alias the columns in the
// table correctly for this view.
int sz = colList.Length;
var originalNames = queryFrom.GetResolvedColumns();
var newColumnNames = new ObjectName[originalNames.Length];
if (sz > 0)
{
if (sz != originalNames.Length)
{
throw new InvalidOperationException("Column list is not the same size as the columns selected.");
}
for (int i = 0; i < sz; ++i)
{
var colName = colList[i];
newColumnNames[i] = new ObjectName(viewName, colName);
}
}
else
{
sz = originalNames.Length;
for (int i = 0; i < sz; ++i)
{
newColumnNames[i] = new ObjectName(viewName, originalNames[i].Name);
}
}
// Check there are no repeat column names in the table.
for (int i = 0; i < sz; ++i)
{
var columnName = newColumnNames[i];
for (int n = i + 1; n < sz; ++n)
{
if (newColumnNames[n].Equals(columnName))
{
throw new InvalidOperationException(String.Format("Duplicate column name '{0}' in view. A view may not contain duplicate column names.", columnName));
}
}
}
// Wrap the plan around a SubsetNode plan
queryPlan = new SubsetNode(queryPlan, originalNames, newColumnNames);
return(new Prepared(viewName, QueryExpression, queryPlan, ReplaceIfExists));
}
IStatement IPreparableStatement.Prepare(IRequest request)
{
var cursor = request.FindCursor(CursorName);
if (cursor == null)
{
throw new ObjectNotFoundException(new ObjectName(CursorName), "The source cursor was not found.");
}
var tableName = request.Query.ResolveTableName(TableName);
if (tableName == null)
{
throw new ObjectNotFoundException(TableName);
}
var table = request.Query.GetMutableTable(tableName);
if (table == null)
{
throw new ObjectNotFoundException(tableName);
}
var columns = table.TableInfo.Select(x => new ObjectName(tableName, x.ColumnName));
var queryExpression = cursor.QueryExpression;
var queryFrom = QueryExpressionFrom.Create(request, queryExpression);
var assignments = new List <SqlColumnAssignment>();
foreach (var column in columns)
{
// TODO:
}
// TODO: get the columns from the table and the columns exposed by the cursor
// and then make a set of assignments
throw new NotImplementedException();
}
