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| 1 | +using Azure.DataApiBuilder.Config.ObjectModel; |
| 2 | +using Azure.DataApiBuilder.Core.Models; |
| 3 | + |
| 4 | +namespace Azure.DataApiBuilder.Core.Resolvers |
| 5 | +{ |
| 6 | + /// <summary> |
| 7 | + /// Base query builder class for T-SQL engine |
| 8 | + /// Can be used by dwsql and mssql |
| 9 | + /// </summary> |
| 10 | + public abstract class BaseTSqlQueryBuilder : BaseSqlQueryBuilder |
| 11 | + { |
| 12 | + protected const string FOR_JSON_SUFFIX = " FOR JSON PATH, INCLUDE_NULL_VALUES"; |
| 13 | + protected const string WITHOUT_ARRAY_WRAPPER_SUFFIX = "WITHOUT_ARRAY_WRAPPER"; |
| 14 | + |
| 15 | + /// <summary> |
| 16 | + /// Build the Json Path query needed to append to the main query |
| 17 | + /// </summary> |
| 18 | + /// <param name="structure">Sql query structure to build query on</param> |
| 19 | + /// <returns>SQL query with JSON PATH format</returns> |
| 20 | + protected virtual string BuildJsonPath(SqlQueryStructure structure) |
| 21 | + { |
| 22 | + string query = string.Empty; |
| 23 | + query += FOR_JSON_SUFFIX; |
| 24 | + if (!structure.IsListQuery) |
| 25 | + { |
| 26 | + query += "," + WITHOUT_ARRAY_WRAPPER_SUFFIX; |
| 27 | + } |
| 28 | + |
| 29 | + return query; |
| 30 | + } |
| 31 | + |
| 32 | + /// <summary> |
| 33 | + /// Build the predicates query needed to append to the main query |
| 34 | + /// </summary> |
| 35 | + /// <param name="structure">Sql query structure to build query on</param> |
| 36 | + /// <returns>SQL query with predicates</returns> |
| 37 | + protected virtual string BuildPredicates(SqlQueryStructure structure) |
| 38 | + { |
| 39 | + return JoinPredicateStrings( |
| 40 | + structure.GetDbPolicyForOperation(EntityActionOperation.Read), |
| 41 | + structure.FilterPredicates, |
| 42 | + Build(structure.Predicates), |
| 43 | + Build(structure.PaginationMetadata.PaginationPredicate)); |
| 44 | + } |
| 45 | + |
| 46 | + /// <summary> |
| 47 | + /// Build the Group By Clause needed to append to the main query |
| 48 | + /// </summary> |
| 49 | + /// <param name="structure">Sql query structure to build query on</param> |
| 50 | + /// <returns>SQL query with group-by clause</returns> |
| 51 | + protected virtual string BuildGroupBy(SqlQueryStructure structure) |
| 52 | + { |
| 53 | + // Add GROUP BY clause if there are any group by columns |
| 54 | + if (structure.GroupByMetadata.Fields.Any()) |
| 55 | + { |
| 56 | + return $" GROUP BY {string.Join(", ", structure.GroupByMetadata.Fields.Values.Select(c => Build(c)))}"; |
| 57 | + } |
| 58 | + |
| 59 | + return string.Empty; |
| 60 | + } |
| 61 | + |
| 62 | + /// <summary> |
| 63 | + /// Build the Having clause needed to append to the main query |
| 64 | + /// </summary> |
| 65 | + /// <param name="structure">Sql query structure to build query on</param> |
| 66 | + /// <returns>SQL query with having clause</returns> |
| 67 | + protected virtual string BuildHaving(SqlQueryStructure structure) |
| 68 | + { |
| 69 | + if (structure.GroupByMetadata.Aggregations.Count > 0) |
| 70 | + { |
| 71 | + List<Predicate>? havingPredicates = structure.GroupByMetadata.Aggregations |
| 72 | + .SelectMany(aggregation => aggregation.HavingPredicates ?? new List<Predicate>()) |
| 73 | + .ToList(); |
| 74 | + |
| 75 | + if (havingPredicates.Any()) |
| 76 | + { |
| 77 | + return $" HAVING {Build(havingPredicates)}"; |
| 78 | + } |
| 79 | + } |
| 80 | + |
| 81 | + return string.Empty; |
| 82 | + } |
| 83 | + |
| 84 | + /// <summary> |
| 85 | + /// Build the Order By clause needed to append to the main query |
| 86 | + /// </summary> |
| 87 | + /// <param name="structure">Sql query structure to build query on</param> |
| 88 | + /// <returns>SQL query with order-by clause</returns> |
| 89 | + protected virtual string BuildOrderBy(SqlQueryStructure structure) |
| 90 | + { |
| 91 | + if (structure.OrderByColumns.Any()) |
| 92 | + { |
| 93 | + return $" ORDER BY {Build(structure.OrderByColumns)}"; |
| 94 | + } |
| 95 | + |
| 96 | + return string.Empty; |
| 97 | + } |
| 98 | + |
| 99 | + /// <summary> |
| 100 | + /// Build the aggregation columns needed to append to the main query |
| 101 | + /// </summary> |
| 102 | + /// <param name="structure">Sql query structure to build query on</param> |
| 103 | + /// <returns>SQL query with aggregation columns</returns> |
| 104 | + protected virtual string BuildAggregationColumns(SqlQueryStructure structure) |
| 105 | + { |
| 106 | + string aggregations = string.Empty; |
| 107 | + if (structure.GroupByMetadata.Aggregations.Count > 0) |
| 108 | + { |
| 109 | + if (structure.Columns.Any()) |
| 110 | + { |
| 111 | + aggregations = $",{BuildAggregationColumns(structure.GroupByMetadata)}"; |
| 112 | + } |
| 113 | + else |
| 114 | + { |
| 115 | + aggregations = $"{BuildAggregationColumns(structure.GroupByMetadata)}"; |
| 116 | + } |
| 117 | + } |
| 118 | + |
| 119 | + return aggregations; |
| 120 | + } |
| 121 | + |
| 122 | + /// <summary> |
| 123 | + /// Build the aggregation columns needed to append to the main query |
| 124 | + /// </summary> |
| 125 | + /// <param name="metadata">GroupByMetadata</param> |
| 126 | + /// <returns>SQL query with aggregation columns</returns> |
| 127 | + protected virtual string BuildAggregationColumns(GroupByMetadata metadata) |
| 128 | + { |
| 129 | + return string.Join(", ", metadata.Aggregations.Select(aggregation => Build(aggregation.Column, useAlias: true))); |
| 130 | + } |
| 131 | + } |
| 132 | +} |
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