rawsql-ts/dist/esm/transformers/CTEInjector.js

[beta]High-performance SQL parser and AST analyzer written in TypeScript. Provides fast parsing and advanced transformation capabilities.

import { BinarySelectQuery, SimpleSelectQuery } from "../models/SelectQuery";
import { CTECollector } from "./CTECollector";
import { CTEBuilder } from "./CTEBuilder";
/**
 * CTEInjector accepts a SelectQuery object and an array of CommonTables,
 * and inserts Common Table Expressions into the query.
 * For BinarySelectQuery, CTEs are inserted into the left query.
 *
 * Uses CTENameConflictResolver to resolve naming conflicts between CTEs.
 */
export class CTEInjector {
    constructor() {
        this.nameConflictResolver = new CTEBuilder();
        this.cteCollector = new CTECollector();
    }
    /**
     * Inserts Common Table Expressions into a SelectQuery object.
     *
     * @param query The query to inject CTEs into
     * @param commonTables Array of CommonTables to be inserted
     * @returns A new query with the injected CTEs
     */
    inject(query, commonTables) {
        // If the array is empty, return the query as is
        if (commonTables.length === 0) {
            return query;
        }
        // Collect CTEs from the query
        commonTables.push(...this.cteCollector.collect(query));
        // Use CTENameConflictResolver to resolve duplicates and sort in appropriate order
        const resolvedWithCaluse = this.nameConflictResolver.build(commonTables);
        // Process based on query type
        if (query instanceof SimpleSelectQuery) {
            return this.injectIntoSimpleQuery(query, resolvedWithCaluse);
        }
        else if (query instanceof BinarySelectQuery) {
            return this.injectIntoBinaryQuery(query, resolvedWithCaluse);
        }
        // Unsupported query type
        throw new Error("Unsupported query type");
    }
    /**
     * Inserts Common Table Expressions into a SimpleSelectQuery.
     *
     * @param query The SimpleSelectQuery to inject CTEs into
     * @param commonTables Array of CommonTables to be inserted
     * @param needRecursive Boolean indicating if recursive WITH clause is needed
     * @returns A new SimpleSelectQuery with the injected CTEs
     */
    injectIntoSimpleQuery(query, withClause) {
        if (query.withClause) {
            throw new Error("The query already has a WITH clause. Please remove it before injecting new CTEs.");
        }
        // If the query doesn't have a WITH clause, set the new one
        query.withClause = withClause;
        return query;
    }
    /**
     * Inserts Common Table Expressions into the left query of a BinarySelectQuery.
     *
     * @param query The BinarySelectQuery to inject CTEs into
     * @param commonTables Array of CommonTables to be inserted
     * @param needRecursive Boolean indicating if recursive WITH clause is needed
     * @returns A new BinarySelectQuery with the injected CTEs
     */
    injectIntoBinaryQuery(query, withClause) {
        // Insert CTEs into the left query
        if (query.left instanceof SimpleSelectQuery) {
            this.injectIntoSimpleQuery(query.left, withClause);
            return query;
        }
        else if (query.left instanceof BinarySelectQuery) {
            this.injectIntoBinaryQuery(query.left, withClause);
            return query;
        }
        throw new Error("Unsupported query type for BinarySelectQuery left side");
    }
}
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