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