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query-interface.js
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query-interface.js
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'use strict';
const sequelizeErrors = require('../../errors');
const QueryTypes = require('../../query-types');
const { QueryInterface } = require('../abstract/query-interface');
const { cloneDeep } = require('../../utils');
const _ = require('lodash');
/**
* The interface that Sequelize uses to talk with SQLite database
*/
class SQLiteQueryInterface extends QueryInterface {
/**
* A wrapper that fixes SQLite's inability to remove columns from existing tables.
* It will create a backup of the table, drop the table afterwards and create a
* new table with the same name but without the obsolete column.
*
* @override
*/
async removeColumn(tableName, attributeName, options) {
options = options || {};
const fields = await this.describeTable(tableName, options);
delete fields[attributeName];
const sql = this.queryGenerator.removeColumnQuery(tableName, fields);
const subQueries = sql.split(';').filter(q => q !== '');
for (const subQuery of subQueries) await this.sequelize.query(`${subQuery};`, { raw: true, ...options });
}
/**
* A wrapper that fixes SQLite's inability to change columns from existing tables.
* It will create a backup of the table, drop the table afterwards and create a
* new table with the same name but with a modified version of the respective column.
*
* @override
*/
async changeColumn(tableName, attributeName, dataTypeOrOptions, options) {
options = options || {};
const fields = await this.describeTable(tableName, options);
Object.assign(fields[attributeName], this.normalizeAttribute(dataTypeOrOptions));
const sql = this.queryGenerator.removeColumnQuery(tableName, fields);
const subQueries = sql.split(';').filter(q => q !== '');
for (const subQuery of subQueries) await this.sequelize.query(`${subQuery};`, { raw: true, ...options });
}
/**
* A wrapper that fixes SQLite's inability to rename columns from existing tables.
* It will create a backup of the table, drop the table afterwards and create a
* new table with the same name but with a renamed version of the respective column.
*
* @override
*/
async renameColumn(tableName, attrNameBefore, attrNameAfter, options) {
options = options || {};
const fields = await this.assertTableHasColumn(tableName, attrNameBefore, options);
fields[attrNameAfter] = { ...fields[attrNameBefore] };
delete fields[attrNameBefore];
const sql = this.queryGenerator.renameColumnQuery(tableName, attrNameBefore, attrNameAfter, fields);
const subQueries = sql.split(';').filter(q => q !== '');
for (const subQuery of subQueries) await this.sequelize.query(`${subQuery};`, { raw: true, ...options });
}
/**
* @override
*/
async removeConstraint(tableName, constraintName, options) {
let createTableSql;
const constraints = await this.showConstraint(tableName, constraintName);
// sqlite can't show only one constraint, so we find here the one to remove
const constraint = constraints.find(constaint => constaint.constraintName === constraintName);
if (!constraint) {
throw new sequelizeErrors.UnknownConstraintError({
message: `Constraint ${constraintName} on table ${tableName} does not exist`,
constraint: constraintName,
table: tableName
});
}
createTableSql = constraint.sql;
constraint.constraintName = this.queryGenerator.quoteIdentifier(constraint.constraintName);
let constraintSnippet = `, CONSTRAINT ${constraint.constraintName} ${constraint.constraintType} ${constraint.constraintCondition}`;
if (constraint.constraintType === 'FOREIGN KEY') {
const referenceTableName = this.queryGenerator.quoteTable(constraint.referenceTableName);
constraint.referenceTableKeys = constraint.referenceTableKeys.map(columnName => this.queryGenerator.quoteIdentifier(columnName));
const referenceTableKeys = constraint.referenceTableKeys.join(', ');
constraintSnippet += ` REFERENCES ${referenceTableName} (${referenceTableKeys})`;
constraintSnippet += ` ON UPDATE ${constraint.updateAction}`;
constraintSnippet += ` ON DELETE ${constraint.deleteAction}`;
}
createTableSql = createTableSql.replace(constraintSnippet, '');
createTableSql += ';';
const fields = await this.describeTable(tableName, options);
const sql = this.queryGenerator._alterConstraintQuery(tableName, fields, createTableSql);
const subQueries = sql.split(';').filter(q => q !== '');
for (const subQuery of subQueries) await this.sequelize.query(`${subQuery};`, { raw: true, ...options });
}
/**
* @override
*/
async addConstraint(tableName, options) {
if (!options.fields) {
throw new Error('Fields must be specified through options.fields');
}
if (!options.type) {
throw new Error('Constraint type must be specified through options.type');
}
options = cloneDeep(options);
const constraintSnippet = this.queryGenerator.getConstraintSnippet(tableName, options);
const describeCreateTableSql = this.queryGenerator.describeCreateTableQuery(tableName);
const constraints = await this.sequelize.query(describeCreateTableSql, { ...options, type: QueryTypes.SELECT, raw: true });
let sql = constraints[0].sql;
const index = sql.length - 1;
//Replace ending ')' with constraint snippet - Simulates String.replaceAt
//http://stackoverflow.com/questions/1431094
const createTableSql = `${sql.substr(0, index)}, ${constraintSnippet})${sql.substr(index + 1)};`;
const fields = await this.describeTable(tableName, options);
sql = this.queryGenerator._alterConstraintQuery(tableName, fields, createTableSql);
const subQueries = sql.split(';').filter(q => q !== '');
for (const subQuery of subQueries) await this.sequelize.query(`${subQuery};`, { raw: true, ...options });
}
/**
* @override
*/
async getForeignKeyReferencesForTable(tableName, options) {
const database = this.sequelize.config.database;
const query = this.queryGenerator.getForeignKeysQuery(tableName, database);
const result = await this.sequelize.query(query, options);
return result.map(row => ({
tableName,
columnName: row.from,
referencedTableName: row.table,
referencedColumnName: row.to,
tableCatalog: database,
referencedTableCatalog: database
}));
}
/**
* @override
*/
async dropAllTables(options) {
options = options || {};
const skip = options.skip || [];
const tableNames = await this.showAllTables(options);
await this.sequelize.query('PRAGMA foreign_keys = OFF', options);
await this._dropAllTables(tableNames, skip, options);
await this.sequelize.query('PRAGMA foreign_keys = ON', options);
}
/**
* @override
*/
async describeTable(tableName, options) {
let schema = null;
let schemaDelimiter = null;
if (typeof options === 'string') {
schema = options;
} else if (typeof options === 'object' && options !== null) {
schema = options.schema || null;
schemaDelimiter = options.schemaDelimiter || null;
}
if (typeof tableName === 'object' && tableName !== null) {
schema = tableName.schema;
tableName = tableName.tableName;
}
const sql = this.queryGenerator.describeTableQuery(tableName, schema, schemaDelimiter);
options = { ...options, type: QueryTypes.DESCRIBE };
const sqlIndexes = this.queryGenerator.showIndexesQuery(tableName);
try {
const data = await this.sequelize.query(sql, options);
/*
* If no data is returned from the query, then the table name may be wrong.
* Query generators that use information_schema for retrieving table info will just return an empty result set,
* it will not throw an error like built-ins do (e.g. DESCRIBE on MySql).
*/
if (_.isEmpty(data)) {
throw new Error(`No description found for "${tableName}" table. Check the table name and schema; remember, they _are_ case sensitive.`);
}
const indexes = await this.sequelize.query(sqlIndexes, options);
for (const prop in data) {
data[prop].unique = false;
}
for (const index of indexes) {
for (const field of index.fields) {
if (index.unique !== undefined) {
data[field.attribute].unique = index.unique;
}
}
}
const foreignKeys = await this.getForeignKeyReferencesForTable(tableName, options);
for (const foreignKey of foreignKeys) {
data[foreignKey.columnName].references = {
model: foreignKey.referencedTableName,
key: foreignKey.referencedColumnName
};
}
return data;
} catch (e) {
if (e.original && e.original.code === 'ER_NO_SUCH_TABLE') {
throw new Error(`No description found for "${tableName}" table. Check the table name and schema; remember, they _are_ case sensitive.`);
}
throw e;
}
}
}
exports.SQLiteQueryInterface = SQLiteQueryInterface;