Kentico WITH AllData AS 以及Between and
c:\workspace\company\kentico\source\kentico12\DataEngine\Database\Helpers\SqlHelper.cs
/// <summary>
/// Gets a nested query using WITH for further evaluation
/// </summary>
private static string GetWithQuery(string queryText)
{
var result = String.Format(
@"
WITH AllData AS
(
{0}
)
SELECT ##TOPN## ##COLUMNS##
FROM AllData
WHERE ##WHERE##
ORDER BY ##ORDERBY##
", queryText);
return result;
}
/// <summary>
/// Gets the condition matching values of the column between from and to
/// </summary>
/// <param name="column">Column name</param>
/// <param name="from">From value</param>
/// <param name="to">To value</param>
public static string GetBetween(string column, int from, int to)
{
return String.Format("{0} BETWEEN {1} AND {2}", column, from, to);
}
c:\workspace\company\kentico\source\kentico12\DataEngine\Database\Helpers\SqlHelper.cs
public static string PreparePagedQuery(string queryText, QueryMacros macros, int offset, int maxRecords, bool getTotal = true, bool subQuery = false)
{
var columns = macros.Columns;
// Build the query
if (String.IsNullOrEmpty(columns))
{
columns = "*";
}
HandleEmptyColumns(ref columns);
var orderBy = macros.OrderBy;
HandleEmptyColumns(ref orderBy);
// Add the system columns for paging
if (!String.IsNullOrEmpty(orderBy))
{
if (macros.TopN <= 0)
{
// Remove Order by if TopN is not specified (cause exceptions)
queryText = SqlMacroHelper.RemoveOrderBy(queryText);
}
var originalColumns = columns;
// Append row number
string rowNumber = new RowNumberColumn(SystemColumns.ROW_NUMBER, orderBy).ToString();
columns = AddColumns(columns, rowNumber);
// Build the query text
var rowsWhere = GetBetween(SystemColumns.ROW_NUMBER, offset + 1, offset + maxRecords);
var totalColumn = (getTotal ? GetTotalColumn(macros.Total, subQuery) : null);
if (subQuery)
{
// Get query as sub-query
var cols = AddColumns(originalColumns, totalColumn);
queryText = PrepareNestedQuery(queryText, rowsWhere, null, 0, cols);
}
else
{
// Get query with CTE
queryText = PrepareWithQuery(queryText, rowsWhere, SystemColumns.ROW_NUMBER, 0, totalColumn);
}
orderBy = null;
}
// Update fields in expressions
macros.OrderBy = orderBy;
macros.Columns = columns;
return queryText;
}
c:\workspace\company\kentico\source\kentico12\DataEngine\Query\Data\DataQueryBase.cs
queryText = SqlHelper.PreparePagedQuery(queryText, expressions, settings.Offset, settings.MaxRecords, !settings.IsSubQuery, isInnerQuery);
private string GenerateQueryText(DataQuerySettings settings)
{
string queryText;
lock (lockObject)
{
// Prepare complete parameters
if (settings == null)
{
settings = GetCompleteSettings();
}
// Get base query text
queryText = GetBaseQueryText();
var parameters = settings.Parameters;
var expressions = settings.GetExpressions(parameters);
var isInnerQuery = settings.IsSubQuery || settings.IsNested;
if (settings.IsPagedQuery)
{
// Check if OrderBy is set
if (String.IsNullOrEmpty(expressions.OrderBy))
{
throw new NotSupportedException("[DataQuery.GenerateQueryText]: The paged query cannot be generated without the orderBy set.");
}
// Prepare the query
queryText = SqlHelper.PreparePagedQuery(queryText, expressions, settings.Offset, settings.MaxRecords, !settings.IsSubQuery, isInnerQuery);
}
// Prepare query and resolve macros
if (parameters != null)
{
queryText = isInnerQuery ? parameters.ResolveMacros(queryText) : parameters.GetCompleteQueryText(queryText);
}
queryText = expressions.ResolveMacros(queryText);
}
return queryText;
}
c:\workspace\company\kentico\source\kentico12\DataEngine\Query\Execution\QueryParameters.cs
var queryText = SqlHelper.PreparePagedQuery(Text, macros, Offset, maxRecords, getTotal, subQuery);
internal void FinalizeForExecution(bool getTotal = true, bool subQuery = false)
{
var maxRecords = MaxRecords;
if (maxRecords > 0)
{
// Transform parameters to a paging query if paging is configured
SqlHelper.CheckPagedQuery(this);
// Prepare the query
var macros = Macros;
var queryText = SqlHelper.PreparePagedQuery(Text, macros, Offset, maxRecords, getTotal, subQuery);
// Prepare the parameters and always allow cache for paged results (always is select)
Text = queryText;
Offset = 0;
MaxRecords = 0;
}
IsForExecution = true;
}
作者:Chuck Lu GitHub |
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