test-easy-psql/dist/indexes.js

Welcome to the test-easy-psql documentation! test-easy-psql is a simple intermediary for querying data in PostgreSQL databases. Whether you're a beginner or an experienced developer, this documentation will help you get started with test-easy-psql and lev

"use strict";

const DB = require("./db");
class Index {
  constructor({
    type,
    columns,
    auto_increment,
    table,
    onUpdate,
    onDelete
  }) {
    this.type = type;
    this.columns = columns;
    this.auto_increment;
    this.table = table;
  }
  produceIndexCreateSQL() {
    switch (this.type.toLowerCase()) {
      case "primary":
        return {
          up: this.produceCreatePrimaryKeySQL(),
          down: this.produceDropPrimaryKeySQL()
        };
    }
  }
  produceCreatePrimaryKeySQL() {
    const cols = Array.isArray(columns) ? columns : [columns];
    if (auto_increment && cols.length > 1) {
      throw new Error("composite primary key cannot be auto increment");
    }
    let sequence = "";
    if (auto_increment) {
      const sequence_name = `${DB.database}_${this.table}_${cols.map(x => x.column).join("_")}_sequence`;
      sequence = `CREATE SEQUENCE ${DB.database}.${sequence_name} INCREMENT 1 START 1 MINVALUE 1;ALTER TABLE ALTER COLUMN ${cols.map(x => x.column).join(",")} SET DEFAULT nextval('${sequence_name}'::regclass);`;
    }
    return `${sequence}ALTER TABLE ${DB.database}.${this.table} ADD PRIMARY KEY (${columns.map(x => x.column)})`;
  }
  produceDropPrimaryKeySQL() {
    const cols = Array.isArray(columns) ? columns : [columns];
    if (auto_increment && cols.length > 1) {
      throw new Error("composite primary key cannot be auto increment");
    }
    let sequence = "";
    if (auto_increment) {
      const sequence_name = `${DB.database}_${this.table}_${cols.map(x => x.column).join("_")}_sequence`;
      sequence = `DROP SEQUENCE  INCREMENT 1 START 1 MINVALUE 1;ALTER TABLE ALTER COLUMN ${cols.map(x => x.column).join(",")} SET DEFAULT nextval('${sequence_name}'::regclass);`;
    }
  }
  produceCreateForeignKeySQL() {}
  productDropForeignKeySQL() {}
}
module.exports = Index;