@iarayan/ch-orm/dist/esm/schema/Migration.js

A Developer-First ClickHouse ORM with Powerful CLI Tools

import { Schema } from "./Schema";
/**
 * Abstract base class for database migrations
 * Provides structure and common functionality for migrations
 */
export class Migration {
    /**
     * Create a new Migration instance
     * @param connection - ClickHouse connection
     */
    constructor(connection) {
        /**
         * Indicates if migration has been applied
         */
        this.applied = false;
        this.connection = connection;
        this.schema = new Schema(connection);
        this.name = this.constructor.name;
    }
    /**
     * Apply the migration
     * @returns Promise that resolves when the migration is applied
     */
    async apply() {
        if (this.applied) {
            throw new Error(`Migration ${this.name} has already been applied`);
        }
        try {
            // Apply the migration
            await this.up();
            // Mark as applied
            this.applied = true;
        }
        catch (error) {
            throw new Error(`Failed to apply migration ${this.name}: ${error}`);
        }
    }
    /**
     * Revert the migration
     * @returns Promise that resolves when the migration is reverted
     */
    async revert() {
        if (!this.applied) {
            throw new Error(`Migration ${this.name} has not been applied yet`);
        }
        try {
            // Revert the migration
            await this.down();
            // Mark as not applied
            this.applied = false;
        }
        catch (error) {
            throw new Error(`Failed to revert migration ${this.name}: ${error}`);
        }
    }
    /**
     * Get the migration name
     * @returns Migration name
     */
    getName() {
        return this.name;
    }
    /**
     * Check if the migration has been applied
     * @returns True if the migration has been applied, false otherwise
     */
    isApplied() {
        return this.applied;
    }
    /**
     * Set the applied state of the migration
     * @param state - Applied state
     */
    setApplied(state) {
        this.applied = state;
    }
}
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