builder concept

src/helpers/dynamicQueryBuilder.ts

@@ -1,5 +1,6 @@
+import { Brackets, DataSource, ObjectLiteral, SelectQueryBuilder } from "typeorm";
 import { dataSource } from "../data-source";
-import { DynamicQueryStructure } from "../type/dynamicQueries";
+import { ConditionStructure, DynamicQueryStructure } from "../type/dynamicQueries";
 import { TableMeta } from "../type/tableMeta";
 
 export default abstract class DynamicQueryBuilder {
@@ -45,11 +46,201 @@ export default abstract class DynamicQueryBuilder {
     return this.allowedTables.map((table) => this.getTableMeta(table));
   }
 
-  public static buildQuery(query: DynamicQueryStructure, offset: number = 0, count: number = 25) {
+  public static buildQuery(
-    // execute:
+    queryObj: DynamicQueryStructure,
-    // .offset(offset)
+    offset: number = 0,
-    // .limit(count)
+    count: number = 25
-    // .getManyAndCount()
+  ): SelectQueryBuilder<ObjectLiteral> {
+    let query = dataSource.getRepository(queryObj.table).createQueryBuilder(queryObj.table + "_0");
+    query = this.buildDynamicQuery(query, queryObj);
+    query = query.offset(offset);
+    query = query.limit(count);
+
+    return query;
+
+    dataSource
+      .getRepository("member")
+      .createQueryBuilder("member_0")
+      .select("member_0.firstname")
+      .addSelect("member_0.lastname")
+      .where("member_0.mail LIKE '%@gmail.com'")
+      .andWhere(
+        new Brackets((qb) => {
+          qb.where("user.firstName LIKE '%J'").orWhere("user.lastName LIKE '%K'");
+        })
+      )
+      .leftJoinAndSelect("member_0.sendNewsletter", "communication_0")
+      .addSelect("communication_0.*")
+      .orderBy("member_0.firstname", "ASC")
+      .addOrderBy("member_0.lastname", "ASC");
+  }
+
+  public static buildDynamicQuery(
+    queryBuilder: SelectQueryBuilder<ObjectLiteral>,
+    queryObject: DynamicQueryStructure,
+    depth: number = 0
+  ): SelectQueryBuilder<ObjectLiteral> {
+    const alias = queryObject.table + "_" + depth;
+
+    // Handle SELECT
+    if (queryObject.select == "*") {
+      queryBuilder.select(`${alias}.*`);
+    } else {
+      queryBuilder.select(queryObject.select.map((col) => `${alias}.${col}`));
+    }
+
+    // Handle WHERE
+    if (queryObject.where) {
+      this.applyWhere(queryBuilder, queryObject.where, alias);
+    }
+
+    // Handle JOINS
+    if (queryObject.join) {
+      queryObject.join.forEach((join) => {
+        const joinAlias = join.table;
+        const joinType = "leftJoin"; // Default join type
+        const joinCondition = `${alias}.${join.foreignColumn} = ${joinAlias}.${join.foreignColumn}`;
+
+        queryBuilder[joinType](`${join.table}`, joinAlias, joinCondition);
+
+        // Recursively handle sub-joins and their conditions
+        this.buildDynamicQuery(queryBuilder, join, depth + 1);
+      });
+    }
+
+    // Handle ORDER BY
+    if (queryObject.orderBy) {
+      queryObject.orderBy.forEach((order) => {
+        queryBuilder.addOrderBy(`${alias}.${order.column}`, order.order);
+      });
+    }
+
+    return queryBuilder;
+  }
+
+  // Helper: Apply WHERE conditions
+  public static applyWhere<T>(
+    queryBuilder: SelectQueryBuilder<T>,
+    conditions: Array<ConditionStructure>,
+    alias: string
+  ): void {
+    conditions.forEach((condition, index) => {
+      if (condition.structureType === "condition") {
+        const whereClause = this.buildConditionClause(condition, alias);
+        const whereMethod = condition.concat === "_" ? "where" : "andWhere";
+
+        if (condition.concat === "OR") {
+          queryBuilder.orWhere(whereClause.query, whereClause.parameters);
+        } else {
+          queryBuilder[whereMethod](whereClause.query, whereClause.parameters);
+        }
+      } else if (condition.structureType === "nested") {
+        const nestedQuery = this.conditionsToQuery(condition.condition, alias);
+        const whereMethod = condition.concat === "OR" ? "orWhere" : "andWhere";
+
+        queryBuilder[whereMethod](`(${nestedQuery.query})`, nestedQuery.parameters);
+      }
+    });
+  }
+
+  // Helper: Build a single condition clause
+  public static buildConditionClause(
+    condition: ConditionStructure,
+    alias: string
+  ): { query: string; parameters: Record<string, unknown> } {
+    if (condition.structureType == "nested") return;
+    const parameterKey = `${alias}_${condition.column}_${Math.random().toString(36).substring(2)}`;
+    let query = `${alias}.${condition.column}`;
+    let parameters: Record<string, unknown> = {};
+
+    switch (condition.operation) {
+      case "eq":
+        query += ` = :${parameterKey}`;
+        parameters[parameterKey] = condition.value;
+        break;
+      case "neq":
+        query += ` != :${parameterKey}`;
+        parameters[parameterKey] = condition.value;
+        break;
+      case "lt":
+        query += ` < :${parameterKey}`;
+        parameters[parameterKey] = condition.value;
+        break;
+      case "lte":
+        query += ` <= :${parameterKey}`;
+        parameters[parameterKey] = condition.value;
+        break;
+      case "gt":
+        query += ` > :${parameterKey}`;
+        parameters[parameterKey] = condition.value;
+        break;
+      case "gte":
+        query += ` >= :${parameterKey}`;
+        parameters[parameterKey] = condition.value;
+        break;
+      case "in":
+        query += ` IN (:...${parameterKey})`;
+        parameters[parameterKey] = condition.value;
+        break;
+      case "notIn":
+        query += ` NOT IN (:...${parameterKey})`;
+        parameters[parameterKey] = condition.value;
+        break;
+      case "between":
+        query += ` BETWEEN :${parameterKey}_start AND :${parameterKey}_end`;
+        parameters[`${parameterKey}_start`] = (condition.value as { start: any }).start;
+        parameters[`${parameterKey}_end`] = (condition.value as { end: any }).end;
+        break;
+      case "null":
+        query += ` IS NULL`;
+        break;
+      case "notNull":
+        query += ` IS NOT NULL`;
+        break;
+      case "contains":
+        query += ` LIKE :${parameterKey}`;
+        parameters[parameterKey] = `%${condition.value}%`;
+        break;
+      case "notContains":
+        query += ` NOT LIKE :${parameterKey}`;
+        parameters[parameterKey] = `%${condition.value}%`;
+        break;
+      case "startsWith":
+        query += ` LIKE :${parameterKey}`;
+        parameters[parameterKey] = `${condition.value}%`;
+        break;
+      case "endsWith":
+        query += ` LIKE :${parameterKey}`;
+        parameters[parameterKey] = `%${condition.value}`;
+        break;
+      default:
+        throw new Error(`Unsupported operation: ${condition.operation}`);
+    }
+
+    return { query, parameters };
+  }
+
+  // Helper: Convert nested conditions to a query
+  public static conditionsToQuery(
+    conditions: Array<ConditionStructure>,
+    alias: string
+  ): { query: string; parameters: Record<string, unknown> } {
+    let queryParts: string[] = [];
+    let parameters: Record<string, unknown> = {};
+
+    conditions.forEach((condition, index) => {
+      if (condition.structureType === "condition") {
+        const clause = this.buildConditionClause(condition, alias);
+        queryParts.push(clause.query);
+        parameters = { ...parameters, ...clause.parameters };
+      } else if (condition.structureType === "nested") {
+        const nested = this.conditionsToQuery(condition.condition, alias);
+        queryParts.push(`(${nested.query})`);
+        parameters = { ...parameters, ...nested.parameters };
+      }
+    });
+
+    return { query: queryParts.join(" AND "), parameters };
   }
 
   // use switch... for compare functions

src/type/dynamicQueries.ts

@@ -3,16 +3,18 @@ export interface DynamicQueryStructure {
   table: string;
   where?: Array<ConditionStructure>;
   join?: Array<DynamicQueryStructure & { foreignColumn: string }>;
-  orderBy?: { [key: string]: "ASC" | "DESC" };
+  orderBy?: Array<OrderByStructure>;
 }
 
 export type ConditionStructure = (
   | {
+      structureType: "condition";
       column: string;
       operation: WhereOperation;
       value: ConditionValue;
     }
   | {
+      structureType: "nested";
       invert?: boolean;
       condition: Array<ConditionStructure>;
     }
@@ -43,6 +45,13 @@ export type WhereOperation =
   | "startsWith" //	Starts with
   | "endsWith"; //	Ends with
 
+export type OrderByStructure = {
+  column: string;
+  order: OrderByType;
+};
+
+export type OrderByType = "ASC" | "DESC";
+
 const exampleQuery: DynamicQueryStructure = {
   select: ["firstname", "lastname"],
   table: "member",
@@ -103,8 +112,14 @@ const exampleQuery: DynamicQueryStructure = {
       ],
     },
   ],
-  orderBy: {
+  orderBy: [
-    firstname: "ASC",
+    {
-    lastname: "ASC",
+      column: "firstname",
-  },
+      order: "ASC",
+    },
+    {
+      column: "lastname",
+      order: "ASC",
+    },
+  ],
 };