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 = function(qi, tableName, attributeName, options) {
options = Object.assign({ raw: true }, options || {});
const findConstraintSql = qi.QueryGenerator.getDefaultConstraintQuery(tableName, attributeName);
return qi.sequelize.query(findConstraintSql, options)
.then(([results]) => {
if (!results.length) {
// No default constraint found -- we can cleanly remove the column
return;
}
const dropConstraintSql = qi.QueryGenerator.dropConstraintQuery(tableName, results[0].name);
return qi.sequelize.query(dropConstraintSql, options);
})
.then(() => {
const findForeignKeySql = qi.QueryGenerator.getForeignKeyQuery(tableName, attributeName);
return qi.sequelize.query(findForeignKeySql, options);
})
.then(([results]) => {
if (!results.length) {
// No foreign key constraints found, so we can remove the column
return;
}
const dropForeignKeySql = qi.QueryGenerator.dropForeignKeyQuery(tableName, results[0].constraint_name);
return qi.sequelize.query(dropForeignKeySql, options);
})
.then(() => {
//Check if the current column is a primaryKey
const primaryKeyConstraintSql = qi.QueryGenerator.getPrimaryKeyConstraintQuery(tableName, attributeName);
return qi.sequelize.query(primaryKeyConstraintSql, options);
})
.then(([result]) => {
if (!result.length) {
return;
}
const dropConstraintSql = qi.QueryGenerator.dropConstraintQuery(tableName, result[0].constraintName);
return qi.sequelize.query(dropConstraintSql, options);
})
.then(() => {
const removeSql = qi.QueryGenerator.removeColumnQuery(tableName, attributeName);
return qi.sequelize.query(removeSql, options);
});
};
module.exports = {
removeColumn
};