public AddTable ( IFromTableSource tableSource ) : void | ||
tableSource | IFromTableSource | |
Результат | void |
public static QueryExpressionFrom Create(IRequest context, SqlQueryExpression expression) { // Get the 'from_clause' from the table expression var fromClause = expression.FromClause; var ignoreCase = context.Query.IgnoreIdentifiersCase(); var queryFrom = new QueryExpressionFrom(ignoreCase); foreach (var fromTable in fromClause.AllTables) { var uniqueKey = fromTable.UniqueKey; var alias = fromTable.Alias; if (fromTable.IsSubQuery) { // eg. FROM ( SELECT id FROM Part ) var subQuery = fromTable.SubQuery; var subQueryFrom = Create(context, subQuery); // The aliased name of the table ObjectName aliasTableName = null; if (alias != null) aliasTableName = new ObjectName(alias); // Add to list of sub-query tables to add to command, queryFrom.AddTable(new FromTableSubQuerySource(ignoreCase, uniqueKey, subQuery, subQueryFrom, aliasTableName)); } else { // Else must be a standard command table, string name = fromTable.Name; // Resolve to full table name var tableName = context.Query.ResolveTableName(name); if (!context.Query.TableExists(tableName)) throw new InvalidOperationException(String.Format("Table '{0}' was not found.", tableName)); ObjectName givenName = null; if (alias != null) givenName = new ObjectName(alias); // Get the ITableQueryInfo object for this table name (aliased). ITableQueryInfo tableQueryInfo = context.Query.GetTableQueryInfo(tableName, givenName); queryFrom.AddTable(new FromTableDirectSource(ignoreCase, tableQueryInfo, uniqueKey, givenName, tableName)); } } // Set up functions, aliases and exposed variables for this from set, foreach (var selectColumn in expression.SelectColumns) { // Is this a glob? (eg. Part.* ) if (selectColumn.IsGlob) { // Find the columns globbed and add to the 'selectedColumns' result. if (selectColumn.IsAll) { queryFrom.ExposeAllColumns(); } else { // Otherwise the glob must be of the form '[table name].*' queryFrom.ExposeColumns(selectColumn.TableName); } } else { // Otherwise must be a standard column reference. Note that at this // time we aren't sure if a column expression is correlated and is // referencing an outer source. This means we can't verify if the // column expression is valid or not at this point. // If this column is aliased, add it as a function reference to the // select expression string alias = selectColumn.Alias; var v = selectColumn.Expression.AsReferenceName(); bool aliasMatchV = (v != null && alias != null && queryFrom.CompareStrings(v.Name, alias)); if (alias != null && !aliasMatchV) { queryFrom.AddExpression(new ExpressionReference(selectColumn.Expression, alias)); queryFrom.ExposeColumn(new ObjectName(alias)); } else if (v != null) { var resolved = queryFrom.ResolveReference(v); queryFrom.ExposeColumn(resolved ?? v); } else { string funName = selectColumn.Expression.ToString(); queryFrom.AddExpression(new ExpressionReference(selectColumn.Expression, funName)); queryFrom.ExposeColumn(new ObjectName(funName)); } } } return queryFrom; }
public static QueryExpressionFrom Create(IRequest context, SqlQueryExpression expression) { // Get the 'from_clause' from the table expression var fromClause = expression.FromClause; var ignoreCase = context.Query.IgnoreIdentifiersCase(); var queryFrom = new QueryExpressionFrom(ignoreCase); foreach (var fromTable in fromClause.AllTables) { var uniqueKey = fromTable.UniqueKey; var alias = fromTable.Alias; if (fromTable.IsSubQuery) { // eg. FROM ( SELECT id FROM Part ) var subQuery = fromTable.SubQuery; var subQueryFrom = Create(context, subQuery); // The aliased name of the table ObjectName aliasTableName = null; if (alias != null) { aliasTableName = new ObjectName(alias); } // Add to list of sub-query tables to add to command, queryFrom.AddTable(new FromTableSubQuerySource(ignoreCase, uniqueKey, subQuery, subQueryFrom, aliasTableName)); } else { // Else must be a standard command table, string name = fromTable.Name; // Resolve to full table name var tableName = context.Query.ResolveTableName(name); if (!context.Query.TableExists(tableName)) { throw new InvalidOperationException(String.Format("Table '{0}' was not found.", tableName)); } ObjectName givenName = null; if (alias != null) { givenName = new ObjectName(alias); } // Get the ITableQueryInfo object for this table name (aliased). ITableQueryInfo tableQueryInfo = context.Query.GetTableQueryInfo(tableName, givenName); queryFrom.AddTable(new FromTableDirectSource(ignoreCase, tableQueryInfo, uniqueKey, givenName, tableName)); } } // Set up functions, aliases and exposed variables for this from set, foreach (var selectColumn in expression.SelectColumns) { // Is this a glob? (eg. Part.* ) if (selectColumn.IsGlob) { // Find the columns globbed and add to the 'selectedColumns' result. if (selectColumn.IsAll) { queryFrom.ExposeAllColumns(); } else { // Otherwise the glob must be of the form '[table name].*' queryFrom.ExposeColumns(selectColumn.TableName); } } else { // Otherwise must be a standard column reference. Note that at this // time we aren't sure if a column expression is correlated and is // referencing an outer source. This means we can't verify if the // column expression is valid or not at this point. // If this column is aliased, add it as a function reference to the // select expression string alias = selectColumn.Alias; var v = selectColumn.Expression.AsReferenceName(); bool aliasMatchV = (v != null && alias != null && queryFrom.CompareStrings(v.Name, alias)); if (alias != null && !aliasMatchV) { queryFrom.AddExpression(new ExpressionReference(selectColumn.Expression, alias)); queryFrom.ExposeColumn(new ObjectName(alias)); } else if (v != null) { var resolved = queryFrom.ResolveReference(v); queryFrom.ExposeColumn(resolved ?? v); } else { string funName = selectColumn.Expression.ToString(); queryFrom.AddExpression(new ExpressionReference(selectColumn.Expression, funName)); queryFrom.ExposeColumn(new ObjectName(funName)); } } } return(queryFrom); }