query-interface.js
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'use strict';
/**
Returns an object that treats MSSQL's inabilities to do certain queries.
@class QueryInterface
@static
@private
*/
/**
A wrapper that fixes MSSQL's inability to cleanly remove columns from existing tables if they have a default constraint.
@param {QueryInterface} qi
@param {string} tableName The name of the table.
@param {string} attributeName The name of the attribute that we want to remove.
@param {object} options
@param {boolean|Function} [options.logging] A function that logs the sql queries, or false for explicitly not logging these queries
@private
*/
const removeColumn = async function(qi, tableName, attributeName, options) {
options = { raw: true, ...options };
const findConstraintSql = qi.QueryGenerator.getDefaultConstraintQuery(tableName, attributeName);
const [results0] = await qi.sequelize.query(findConstraintSql, options);
if (results0.length) {
// No default constraint found -- we can cleanly remove the column
const dropConstraintSql = qi.QueryGenerator.dropConstraintQuery(tableName, results0[0].name);
await qi.sequelize.query(dropConstraintSql, options);
}
const findForeignKeySql = qi.QueryGenerator.getForeignKeyQuery(tableName, attributeName);
const [results] = await qi.sequelize.query(findForeignKeySql, options);
if (results.length) {
// No foreign key constraints found, so we can remove the column
const dropForeignKeySql = qi.QueryGenerator.dropForeignKeyQuery(tableName, results[0].constraint_name);
await qi.sequelize.query(dropForeignKeySql, options);
}
//Check if the current column is a primaryKey
const primaryKeyConstraintSql = qi.QueryGenerator.getPrimaryKeyConstraintQuery(tableName, attributeName);
const [result] = await qi.sequelize.query(primaryKeyConstraintSql, options);
if (result.length) {
const dropConstraintSql = qi.QueryGenerator.dropConstraintQuery(tableName, result[0].constraintName);
await qi.sequelize.query(dropConstraintSql, options);
}
const removeSql = qi.QueryGenerator.removeColumnQuery(tableName, attributeName);
return qi.sequelize.query(removeSql, options);
};
module.exports = {
removeColumn
};