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query-generator.js
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query-generator.js
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'use strict';
const _ = require('lodash');
const Utils = require('../../utils');
const AbstractQueryGenerator = require('../abstract/query-generator');
const util = require('util');
const Op = require('../../operators');
const JSON_FUNCTION_REGEX = /^\s*((?:[a-z]+_){0,2}jsonb?(?:_[a-z]+){0,2})\([^)]*\)/i;
const JSON_OPERATOR_REGEX = /^\s*(->>?|@>|<@|\?[|&]?|\|{2}|#-)/i;
const TOKEN_CAPTURE_REGEX = /^\s*((?:([`"'])(?:(?!\2).|\2{2})*\2)|[\w\d\s]+|[().,;+-])/i;
const FOREIGN_KEY_FIELDS = [
'CONSTRAINT_NAME as constraint_name',
'CONSTRAINT_NAME as constraintName',
'CONSTRAINT_SCHEMA as constraintSchema',
'CONSTRAINT_SCHEMA as constraintCatalog',
'TABLE_NAME as tableName',
'TABLE_SCHEMA as tableSchema',
'TABLE_SCHEMA as tableCatalog',
'COLUMN_NAME as columnName',
'REFERENCED_TABLE_SCHEMA as referencedTableSchema',
'REFERENCED_TABLE_SCHEMA as referencedTableCatalog',
'REFERENCED_TABLE_NAME as referencedTableName',
'REFERENCED_COLUMN_NAME as referencedColumnName'
].join(',');
/**
* list of reserved words in Snowflake
* source: https://docs.snowflake.com/en/sql-reference/reserved-keywords.html
*
* @private
*/
const SNOWFLAKE_RESERVED_WORDS = 'account,all,alter,and,any,as,between,by,case,cast,check,column,connect,connections,constraint,create,cross,current,current_date,current_time,current_timestamp,current_user,database,delete,distinct,drop,else,exists,false,following,for,from,full,grant,group,gscluster,having,ilike,in,increment,inner,insert,intersect,into,is,issue,join,lateral,left,like,localtime,localtimestamp,minus,natural,not,null,of,on,or,order,organization,qualify,regexp,revoke,right,rlike,row,rows,sample,schema,select,set,some,start,table,tablesample,then,to,trigger,true,try_cast,union,unique,update,using,values,view,when,whenever,where,with'.split(',');
const typeWithoutDefault = new Set(['BLOB', 'TEXT', 'GEOMETRY', 'JSON']);
class SnowflakeQueryGenerator extends AbstractQueryGenerator {
constructor(options) {
super(options);
this.OperatorMap = {
...this.OperatorMap,
[Op.regexp]: 'REGEXP',
[Op.notRegexp]: 'NOT REGEXP'
};
}
createDatabaseQuery(databaseName, options) {
options = {
charset: null,
collate: null,
...options
};
return Utils.joinSQLFragments([
'CREATE DATABASE IF NOT EXISTS',
this.quoteIdentifier(databaseName),
options.charset && `DEFAULT CHARACTER SET ${this.escape(options.charset)}`,
options.collate && `DEFAULT COLLATE ${this.escape(options.collate)}`,
';'
]);
}
dropDatabaseQuery(databaseName) {
return `DROP DATABASE IF EXISTS ${this.quoteIdentifier(databaseName)};`;
}
createSchema() {
return 'SHOW TABLES';
}
showSchemasQuery() {
return 'SHOW TABLES';
}
versionQuery() {
return 'SELECT CURRENT_VERSION()';
}
createTableQuery(tableName, attributes, options) {
options = {
charset: null,
rowFormat: null,
...options
};
const primaryKeys = [];
const foreignKeys = {};
const attrStr = [];
for (const attr in attributes) {
if (!Object.prototype.hasOwnProperty.call(attributes, attr)) continue;
const dataType = attributes[attr];
let match;
if (dataType.includes('PRIMARY KEY')) {
primaryKeys.push(attr);
if (dataType.includes('REFERENCES')) {
match = dataType.match(/^(.+) (REFERENCES.*)$/);
attrStr.push(`${this.quoteIdentifier(attr)} ${match[1].replace('PRIMARY KEY', '')}`);
foreignKeys[attr] = match[2];
} else {
attrStr.push(`${this.quoteIdentifier(attr)} ${dataType.replace('PRIMARY KEY', '')}`);
}
} else if (dataType.includes('REFERENCES')) {
match = dataType.match(/^(.+) (REFERENCES.*)$/);
attrStr.push(`${this.quoteIdentifier(attr)} ${match[1]}`);
foreignKeys[attr] = match[2];
} else {
attrStr.push(`${this.quoteIdentifier(attr)} ${dataType}`);
}
}
const table = this.quoteTable(tableName);
let attributesClause = attrStr.join(', ');
const pkString = primaryKeys.map(pk => this.quoteIdentifier(pk)).join(', ');
if (options.uniqueKeys) {
_.each(options.uniqueKeys, (columns, indexName) => {
if (columns.customIndex) {
if (typeof indexName !== 'string') {
indexName = `uniq_${tableName}_${columns.fields.join('_')}`;
}
attributesClause += `, UNIQUE ${this.quoteIdentifier(indexName)} (${columns.fields.map(field => this.quoteIdentifier(field)).join(', ')})`;
}
});
}
if (pkString.length > 0) {
attributesClause += `, PRIMARY KEY (${pkString})`;
}
for (const fkey in foreignKeys) {
if (Object.prototype.hasOwnProperty.call(foreignKeys, fkey)) {
attributesClause += `, FOREIGN KEY (${this.quoteIdentifier(fkey)}) ${foreignKeys[fkey]}`;
}
}
return Utils.joinSQLFragments([
'CREATE TABLE IF NOT EXISTS',
table,
`(${attributesClause})`,
options.comment && typeof options.comment === 'string' && `COMMENT ${this.escape(options.comment)}`,
options.charset && `DEFAULT CHARSET=${options.charset}`,
options.collate && `COLLATE ${options.collate}`,
options.rowFormat && `ROW_FORMAT=${options.rowFormat}`,
';'
]);
}
describeTableQuery(tableName, schema, schemaDelimiter) {
const table = this.quoteTable(
this.addSchema({
tableName,
_schema: schema,
_schemaDelimiter: schemaDelimiter
})
);
return `SHOW FULL COLUMNS FROM ${table};`;
}
showTablesQuery(database) {
return Utils.joinSQLFragments([
'SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE = \'BASE TABLE\'',
database ? `AND TABLE_SCHEMA = ${this.escape(database)}` : 'AND TABLE_SCHEMA NOT IN ( \'INFORMATION_SCHEMA\', \'PERFORMANCE_SCHEMA\', \'SYS\')',
';'
]);
}
tableExistsQuery(table) {
const tableName = table.tableName || table;
const schema = table.schema;
return Utils.joinSQLFragments([
'SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE = \'BASE TABLE\'',
`AND TABLE_SCHEMA = ${schema !== undefined ? this.escape(schema) : 'CURRENT_SCHEMA()'}`,
`AND TABLE_NAME = ${this.escape(tableName)}`,
';'
]);
}
addColumnQuery(table, key, dataType) {
return Utils.joinSQLFragments([
'ALTER TABLE',
this.quoteTable(table),
'ADD',
this.quoteIdentifier(key),
this.attributeToSQL(dataType, {
context: 'addColumn',
tableName: table,
foreignKey: key
}),
';'
]);
}
removeColumnQuery(tableName, attributeName) {
return Utils.joinSQLFragments([
'ALTER TABLE',
this.quoteTable(tableName),
'DROP',
this.quoteIdentifier(attributeName),
';'
]);
}
changeColumnQuery(tableName, attributes) {
const query = (...subQuerys) => Utils.joinSQLFragments([
'ALTER TABLE',
this.quoteTable(tableName),
'ALTER COLUMN',
...subQuerys,
';'
]);
const sql = [];
for (const attributeName in attributes) {
let definition = this.dataTypeMapping(tableName, attributeName, attributes[attributeName]);
const attrSql = [];
if (definition.includes('NOT NULL')) {
attrSql.push(query(this.quoteIdentifier(attributeName), 'SET NOT NULL'));
definition = definition.replace('NOT NULL', '').trim();
} else if (!definition.includes('REFERENCES')) {
attrSql.push(query(this.quoteIdentifier(attributeName), 'DROP NOT NULL'));
}
if (definition.includes('DEFAULT')) {
attrSql.push(query(this.quoteIdentifier(attributeName), 'SET DEFAULT', definition.match(/DEFAULT ([^;]+)/)[1]));
definition = definition.replace(/(DEFAULT[^;]+)/, '').trim();
} else if (!definition.includes('REFERENCES')) {
attrSql.push(query(this.quoteIdentifier(attributeName), 'DROP DEFAULT'));
}
if (definition.match(/UNIQUE;*$/)) {
definition = definition.replace(/UNIQUE;*$/, '');
attrSql.push(query('ADD UNIQUE (', this.quoteIdentifier(attributeName), ')').replace('ALTER COLUMN', ''));
}
if (definition.includes('REFERENCES')) {
definition = definition.replace(/.+?(?=REFERENCES)/, '');
attrSql.push(query('ADD FOREIGN KEY (', this.quoteIdentifier(attributeName), ')', definition).replace('ALTER COLUMN', ''));
} else {
attrSql.push(query(this.quoteIdentifier(attributeName), 'TYPE', definition));
}
sql.push(attrSql.join(''));
}
return sql.join('');
}
renameColumnQuery(tableName, attrBefore, attributes) {
const attrString = [];
for (const attrName in attributes) {
const definition = attributes[attrName];
attrString.push(`'${attrBefore}' '${attrName}' ${definition}`);
}
return Utils.joinSQLFragments([
'ALTER TABLE',
this.quoteTable(tableName),
'RENAME COLUMN',
attrString.join(' to '),
';'
]);
}
handleSequelizeMethod(attr, tableName, factory, options, prepend) {
if (attr instanceof Utils.Json) {
// Parse nested object
if (attr.conditions) {
const conditions = this.parseConditionObject(attr.conditions).map(condition =>
`${this.jsonPathExtractionQuery(condition.path[0], _.tail(condition.path))} = '${condition.value}'`
);
return conditions.join(' AND ');
}
if (attr.path) {
let str;
// Allow specifying conditions using the sqlite json functions
if (this._checkValidJsonStatement(attr.path)) {
str = attr.path;
} else {
// Also support json property accessors
const paths = _.toPath(attr.path);
const column = paths.shift();
str = this.jsonPathExtractionQuery(column, paths);
}
if (attr.value) {
str += util.format(' = %s', this.escape(attr.value));
}
return str;
}
} else if (attr instanceof Utils.Cast) {
if (/timestamp/i.test(attr.type)) {
attr.type = 'datetime';
} else if (attr.json && /boolean/i.test(attr.type)) {
// true or false cannot be casted as booleans within a JSON structure
attr.type = 'char';
} else if (/double precision/i.test(attr.type) || /boolean/i.test(attr.type) || /integer/i.test(attr.type)) {
attr.type = 'decimal';
} else if (/text/i.test(attr.type)) {
attr.type = 'char';
}
}
return super.handleSequelizeMethod(attr, tableName, factory, options, prepend);
}
truncateTableQuery(tableName) {
return Utils.joinSQLFragments([
'TRUNCATE',
this.quoteTable(tableName)
]);
}
deleteQuery(tableName, where, options = {}, model) {
const table = this.quoteTable(tableName);
let whereClause = this.getWhereConditions(where, null, model, options);
const limit = options.limit && ` LIMIT ${this.escape(options.limit)}`;
let primaryKeys = '';
let primaryKeysSelection = '';
if (whereClause) {
whereClause = `WHERE ${whereClause}`;
}
if (limit) {
if (!model) {
throw new Error('Cannot LIMIT delete without a model.');
}
const pks = Object.values(model.primaryKeys).map(pk => this.quoteIdentifier(pk.field)).join(',');
primaryKeys = model.primaryKeyAttributes.length > 1 ? `(${pks})` : pks;
primaryKeysSelection = pks;
return Utils.joinSQLFragments([
'DELETE FROM',
table,
'WHERE',
primaryKeys,
'IN (SELECT',
primaryKeysSelection,
'FROM',
table,
whereClause,
limit,
')',
';'
]);
}
return Utils.joinSQLFragments([
'DELETE FROM',
table,
whereClause,
';'
]);
}
showIndexesQuery() {
return 'SELECT \'\' FROM DUAL';
}
showConstraintsQuery(table, constraintName) {
const tableName = table.tableName || table;
const schemaName = table.schema;
return Utils.joinSQLFragments([
'SELECT CONSTRAINT_CATALOG AS constraintCatalog,',
'CONSTRAINT_NAME AS constraintName,',
'CONSTRAINT_SCHEMA AS constraintSchema,',
'CONSTRAINT_TYPE AS constraintType,',
'TABLE_NAME AS tableName,',
'TABLE_SCHEMA AS tableSchema',
'from INFORMATION_SCHEMA.TABLE_CONSTRAINTS',
`WHERE table_name='${tableName}'`,
constraintName && `AND constraint_name = '${constraintName}'`,
schemaName && `AND TABLE_SCHEMA = '${schemaName}'`,
';'
]);
}
removeIndexQuery(tableName, indexNameOrAttributes) {
let indexName = indexNameOrAttributes;
if (typeof indexName !== 'string') {
indexName = Utils.underscore(`${tableName}_${indexNameOrAttributes.join('_')}`);
}
return Utils.joinSQLFragments([
'DROP INDEX',
this.quoteIdentifier(indexName),
'ON',
this.quoteTable(tableName),
';'
]);
}
attributeToSQL(attribute, options) {
if (!_.isPlainObject(attribute)) {
attribute = {
type: attribute
};
}
const attributeString = attribute.type.toString({ escape: this.escape.bind(this) });
let template = attributeString;
if (attribute.allowNull === false) {
template += ' NOT NULL';
}
if (attribute.autoIncrement) {
template += ' AUTOINCREMENT';
}
// BLOB/TEXT/GEOMETRY/JSON cannot have a default value
if (!typeWithoutDefault.has(attributeString)
&& attribute.type._binary !== true
&& Utils.defaultValueSchemable(attribute.defaultValue)) {
template += ` DEFAULT ${this.escape(attribute.defaultValue)}`;
}
if (attribute.unique === true) {
template += ' UNIQUE';
}
if (attribute.primaryKey) {
template += ' PRIMARY KEY';
}
if (attribute.comment) {
template += ` COMMENT ${this.escape(attribute.comment)}`;
}
if (attribute.first) {
template += ' FIRST';
}
if (attribute.after) {
template += ` AFTER ${this.quoteIdentifier(attribute.after)}`;
}
if (attribute.references) {
if (options && options.context === 'addColumn' && options.foreignKey) {
const attrName = this.quoteIdentifier(options.foreignKey);
const fkName = this.quoteIdentifier(`${options.tableName}_${attrName}_foreign_idx`);
template += `, ADD CONSTRAINT ${fkName} FOREIGN KEY (${attrName})`;
}
template += ` REFERENCES ${this.quoteTable(attribute.references.model)}`;
if (attribute.references.key) {
template += ` (${this.quoteIdentifier(attribute.references.key)})`;
} else {
template += ` (${this.quoteIdentifier('id')})`;
}
if (attribute.onDelete) {
template += ` ON DELETE ${attribute.onDelete.toUpperCase()}`;
}
if (attribute.onUpdate) {
template += ` ON UPDATE ${attribute.onUpdate.toUpperCase()}`;
}
}
return template;
}
attributesToSQL(attributes, options) {
const result = {};
for (const key in attributes) {
const attribute = attributes[key];
result[attribute.field || key] = this.attributeToSQL(attribute, options);
}
return result;
}
/**
* Check whether the statmement is json function or simple path
*
* @param {string} stmt The statement to validate
* @returns {boolean} true if the given statement is json function
* @throws {Error} throw if the statement looks like json function but has invalid token
* @private
*/
_checkValidJsonStatement(stmt) {
if (typeof stmt !== 'string') {
return false;
}
let currentIndex = 0;
let openingBrackets = 0;
let closingBrackets = 0;
let hasJsonFunction = false;
let hasInvalidToken = false;
while (currentIndex < stmt.length) {
const string = stmt.substr(currentIndex);
const functionMatches = JSON_FUNCTION_REGEX.exec(string);
if (functionMatches) {
currentIndex += functionMatches[0].indexOf('(');
hasJsonFunction = true;
continue;
}
const operatorMatches = JSON_OPERATOR_REGEX.exec(string);
if (operatorMatches) {
currentIndex += operatorMatches[0].length;
hasJsonFunction = true;
continue;
}
const tokenMatches = TOKEN_CAPTURE_REGEX.exec(string);
if (tokenMatches) {
const capturedToken = tokenMatches[1];
if (capturedToken === '(') {
openingBrackets++;
} else if (capturedToken === ')') {
closingBrackets++;
} else if (capturedToken === ';') {
hasInvalidToken = true;
break;
}
currentIndex += tokenMatches[0].length;
continue;
}
break;
}
// Check invalid json statement
if (hasJsonFunction && (hasInvalidToken || openingBrackets !== closingBrackets)) {
throw new Error(`Invalid json statement: ${stmt}`);
}
// return true if the statement has valid json function
return hasJsonFunction;
}
dataTypeMapping(tableName, attr, dataType) {
if (dataType.includes('PRIMARY KEY')) {
dataType = dataType.replace('PRIMARY KEY', '');
}
if (dataType.includes('SERIAL')) {
if (dataType.includes('BIGINT')) {
dataType = dataType.replace('SERIAL', 'BIGSERIAL');
dataType = dataType.replace('BIGINT', '');
} else if (dataType.includes('SMALLINT')) {
dataType = dataType.replace('SERIAL', 'SMALLSERIAL');
dataType = dataType.replace('SMALLINT', '');
} else {
dataType = dataType.replace('INTEGER', '');
}
dataType = dataType.replace('NOT NULL', '');
}
return dataType;
}
/**
* Generates an SQL query that returns all foreign keys of a table.
*
* @param {object} table The table.
* @param {string} schemaName The name of the schema.
* @returns {string} The generated sql query.
* @private
*/
getForeignKeysQuery(table, schemaName) {
const tableName = table.tableName || table;
return Utils.joinSQLFragments([
'SELECT',
FOREIGN_KEY_FIELDS,
`FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE where TABLE_NAME = '${tableName}'`,
`AND CONSTRAINT_NAME!='PRIMARY' AND CONSTRAINT_SCHEMA='${schemaName}'`,
'AND REFERENCED_TABLE_NAME IS NOT NULL',
';'
]);
}
/**
* Generates an SQL query that returns the foreign key constraint of a given column.
*
* @param {object} table The table.
* @param {string} columnName The name of the column.
* @returns {string} The generated sql query.
* @private
*/
getForeignKeyQuery(table, columnName) {
const quotedSchemaName = table.schema ? wrapSingleQuote(table.schema) : '';
const quotedTableName = wrapSingleQuote(table.tableName || table);
const quotedColumnName = wrapSingleQuote(columnName);
return Utils.joinSQLFragments([
'SELECT',
FOREIGN_KEY_FIELDS,
'FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE',
'WHERE (',
[
`REFERENCED_TABLE_NAME = ${quotedTableName}`,
table.schema && `AND REFERENCED_TABLE_SCHEMA = ${quotedSchemaName}`,
`AND REFERENCED_COLUMN_NAME = ${quotedColumnName}`
],
') OR (',
[
`TABLE_NAME = ${quotedTableName}`,
table.schema && `AND TABLE_SCHEMA = ${quotedSchemaName}`,
`AND COLUMN_NAME = ${quotedColumnName}`,
'AND REFERENCED_TABLE_NAME IS NOT NULL'
],
')'
]);
}
/**
* Generates an SQL query that removes a foreign key from a table.
*
* @param {string} tableName The name of the table.
* @param {string} foreignKey The name of the foreign key constraint.
* @returns {string} The generated sql query.
* @private
*/
dropForeignKeyQuery(tableName, foreignKey) {
return Utils.joinSQLFragments([
'ALTER TABLE',
this.quoteTable(tableName),
'DROP FOREIGN KEY',
this.quoteIdentifier(foreignKey),
';'
]);
}
addLimitAndOffset(options) {
let fragment = [];
if (options.offset !== null && options.offset !== undefined && options.offset !== 0) {
fragment = fragment.concat([' LIMIT ', this.escape(options.limit), ' OFFSET ', this.escape(options.offset)]);
} else if ( options.limit !== null && options.limit !== undefined ) {
fragment = [' LIMIT ', this.escape(options.limit)];
}
return fragment.join('');
}
/**
* Quote identifier in sql clause
*
* @param {string} identifier
* @param {boolean} force
*
* @returns {string}
*/
quoteIdentifier(identifier, force) {
const optForceQuote = force || false;
const optQuoteIdentifiers = this.options.quoteIdentifiers !== false;
const rawIdentifier = Utils.removeTicks(identifier, '"');
if (
optForceQuote === true ||
optQuoteIdentifiers !== false ||
identifier.includes('.') ||
identifier.includes('->') ||
SNOWFLAKE_RESERVED_WORDS.includes(rawIdentifier.toLowerCase())
) {
// In Snowflake if tables or attributes are created double-quoted,
// they are also case sensitive. If they contain any uppercase
// characters, they must always be double-quoted. This makes it
// impossible to write queries in portable SQL if tables are created in
// this way. Hence, we strip quotes if we don't want case sensitivity.
return Utils.addTicks(rawIdentifier, '"');
}
return rawIdentifier;
}
}
// private methods
function wrapSingleQuote(identifier) {
return Utils.addTicks(identifier, '\'');
}
module.exports = SnowflakeQueryGenerator;