lib/QueryBuilder.js
const Helpers = require('./Helpers');
const QueryBuilderBase = require('./QueryBuilderBase');
/**
* Main object that builds SQL queries.
*
* @param {Driver} Driver - The syntax driver for the database
* @param {Adapter} Adapter - The database module adapter for running queries
* @extends QueryBuilderBase
*/
class QueryBuilder extends QueryBuilderBase {
// ----------------------------------------------------------------------------
// ! Miscellaneous Methods
// ----------------------------------------------------------------------------
/**
* Run a set of queries from a file
*
* @param {string} file - The path to the sql file
* @param {string} [separator=';'] - The character separating each query
* @return {Promise} - The result of all the queries
*/
queryFile (file, separator = ';') {
return Helpers.readFile(file).then(sqlFile => {
const queries = sqlFile.split(separator);
const results = [];
queries.forEach(sql => {
results.push(this.query(sql));
});
return Promise.all(results);
});
}
/**
* Run an arbitrary sql query. Run as a prepared statement.
*
* @param {string} sql - The sql to execute
* @param {Array} [params] - The query parameters
* @return {Promise} - Promise with result of query
*/
query (sql, params) {
return this.adapter.execute(sql, params);
}
/**
* Reset the object state for a new query
*
* @return {void}
*/
resetQuery () {
this._resetState();
}
/**
* Returns the current class state for testing or other purposes
*
* @private
* @return {Object} - The State object
*/
getState () {
return this.state;
}
/**
* Empties the selected database table
*
* @param {string} table - the name of the table to truncate
* @return {void|Promise} - Returns a promise if no callback is supplied
*/
truncate (table) {
return this.query(this.driver.truncate(table));
}
/**
* Closes the database connection for the current adapter
*
* @return {void}
*/
end () {
this.adapter.close();
}
// ------------------------------------------------------------------------
// ! Query Builder Methods
// ------------------------------------------------------------------------
/**
* Specify rows to select in the query
*
* @param {String|Array} fields - The fields to select from the current table
* @example query.select('foo, bar'); // Select multiple fields with a string
* @example query.select(['foo', 'bar']); // Select multiple fileds with an array
* @return {QueryBuilder} - The Query Builder object, for chaining
*/
select (fields) {
// Split/trim fields by comma
fields = (Array.isArray(fields))
? fields
: fields.split(',').map(Helpers.stringTrim);
// Split on 'As'
fields.forEach((field, index) => {
if (/as/i.test(field)) {
fields[index] = field.split(/ as /i).map(Helpers.stringTrim);
}
});
const safeArray = this.driver.quoteIdentifiers(fields);
// Join the strings back together
safeArray.forEach((field, index) => {
if (Array.isArray(field)) {
safeArray[index] = safeArray[index].join(' AS ');
}
});
this.state.selectString += safeArray.join(', ');
return this;
}
/**
* Specify the database table to select from
*
* @param {String} tableName - The table to use for the current query
* @example query.from('tableName');
* @example query.from('tableName t'); // Select the table with an alias
* @return {QueryBuilder} - The Query Builder object, for chaining
*/
from (tableName) {
// Split identifiers on spaces
let identArray = tableName.trim().split(' ').map(Helpers.stringTrim);
// Quote/prefix identifiers
identArray[0] = this.driver.quoteTable(identArray[0]);
identArray = this.driver.quoteIdentifiers(identArray);
// Put it back together
this.state.fromString = identArray.join(' ');
return this;
}
/**
* Add a 'like/ and like' clause to the query
*
* @param {String} field - The name of the field to compare to
* @param {String} val - The value to compare to
* @param {String} [pos=both] - The placement of the wildcard character(s): before, after, or both
* @return {QueryBuilder} - The Query Builder object, for chaining
*/
like (field, val, pos) {
this._like(field, val, pos, ' LIKE ', 'AND');
return this;
}
/**
* Add a 'not like/ and not like' clause to the query
*
* @param {String} field - The name of the field to compare to
* @param {String} val - The value to compare to
* @param {String} [pos=both] - The placement of the wildcard character(s): before, after, or both
* @return {QueryBuilder} - The Query Builder object, for chaining
*/
notLike (field, val, pos) {
this._like(field, val, pos, ' NOT LIKE ', 'AND');
return this;
}
/**
* Add an 'or like' clause to the query
*
* @param {String} field - The name of the field to compare to
* @param {String} val - The value to compare to
* @param {String} [pos=both] - The placement of the wildcard character(s): before, after, or both
* @return {QueryBuilder} - The Query Builder object, for chaining
*/
orLike (field, val, pos) {
this._like(field, val, pos, ' LIKE ', 'OR');
return this;
}
/**
* Add an 'or not like' clause to the query
*
* @param {String} field - The name of the field to compare to
* @param {String} val - The value to compare to
* @param {String} [pos=both] - The placement of the wildcard character(s): before, after, or both
* @return {QueryBuilder} - The Query Builder object, for chaining
*/
orNotLike (field, val, pos) {
this._like(field, val, pos, ' NOT LIKE ', 'OR');
return this;
}
/**
* Add a 'having' clause
*
* @param {String|Object} key - The name of the field and the comparision operator, or an object
* @param {String|Number} [val] - The value to compare if the value of key is a string
* @return {QueryBuilder} - The Query Builder object, for chaining
*/
having (key, val = null) {
this._having(key, val, 'AND');
return this;
}
/**
* Add an 'or having' clause
*
* @param {String|Object} key - The name of the field and the comparision operator, or an object
* @param {String|Number} [val] - The value to compare if the value of key is a string
* @return {QueryBuilder} - The Query Builder object, for chaining
*/
orHaving (key, val = null) {
this._having(key, val, 'OR');
return this;
}
/**
* Set a 'where' clause
*
* @param {String|Object} key - The name of the field and the comparision operator, or an object
* @param {String|Number} [val] - The value to compare if the value of key is a string
* @return {QueryBuilder} - The Query Builder object, for chaining
*/
where (key, val) {
this._where(key, val, 'AND');
return this;
}
/**
* Set a 'or where' clause
*
* @param {String|Object} key - The name of the field and the comparision operator, or an object
* @param {String|Number} [val] - The value to compare if the value of key is a string
* @return {QueryBuilder} - The Query Builder object, for chaining
*/
orWhere (key, val) {
this._where(key, val, 'OR');
return this;
}
/**
* Select a field that is Null
*
* @param {String} field - The name of the field that has a NULL value
* @return {QueryBuilder} - The Query Builder object, for chaining
*/
whereIsNull (field) {
this._whereNull(field, 'IS NULL', 'AND');
return this;
}
/**
* Specify that a field IS NOT NULL
*
* @param {String} field - The name so the field that is not to be null
* @return {QueryBuilder} - The Query Builder object, for chaining
*/
whereIsNotNull (field) {
this._whereNull(field, 'IS NOT NULL', 'AND');
return this;
}
/**
* Field is null prefixed with 'OR'
*
* @param {String} field - The name of the field
* @return {QueryBuilder} - The Query Builder object, for chaining
*/
orWhereIsNull (field) {
this._whereNull(field, 'IS NULL', 'OR');
return this;
}
/**
* Field is not null prefixed with 'OR'
*
* @param {String} field - The name of the field
* @return {QueryBuilder} - The Query Builder object, for chaining
*/
orWhereIsNotNull (field) {
this._whereNull(field, 'IS NOT NULL', 'OR');
return this;
}
/**
* Set a 'where in' clause
*
* @param {String} key - the field to search
* @param {Array} values - the array of items to search in
* @return {QueryBuilder} - The Query Builder object, for chaining
*/
whereIn (key, values) {
this._whereIn(key, values, 'IN', 'AND');
return this;
}
/**
* Set a 'or where in' clause
*
* @param {String} key - the field to search
* @param {Array} values - the array of items to search in
* @return {QueryBuilder} - The Query Builder object, for chaining
*/
orWhereIn (key, values) {
this._whereIn(key, values, 'IN', 'OR');
return this;
}
/**
* Set a 'where not in' clause
*
* @param {String} key - the field to search
* @param {Array} values - the array of items to search in
* @return {QueryBuilder} - The Query Builder object, for chaining
*/
whereNotIn (key, values) {
this._whereIn(key, values, 'NOT IN', 'AND');
return this;
}
/**
* Set a 'or where not in' clause
*
* @param {String} key - the field to search
* @param {Array} values - the array of items to search in
* @return {QueryBuilder} - The Query Builder object, for chaining
*/
orWhereNotIn (key, values) {
this._whereIn(key, values, 'NOT IN', 'OR');
return this;
}
/**
* Set values for insertion or updating
*
* @param {String|Object} key - The key or object to use
* @param {String} [val] - The value if using a scalar key
* @example query.set('foo', 'bar'); // Set a key, value pair
* @example query.set({foo:'bar'}); // Set with an object
* @return {QueryBuilder} - The Query Builder object, for chaining
*/
set (key, val) {
// Set the appropriate state variables
this._mixedSet('setArrayKeys', 'key', key, val);
this._mixedSet('values', 'value', key, val);
// Use the keys of the array to make the insert/update string
// and escape the field names
this.state.setArrayKeys = this.state.setArrayKeys.map(this.driver._quote);
// Generate the "set" string
this.state.setString = this.state.setArrayKeys.join('=?,');
this.state.setString += '=?';
return this;
}
/**
* Add a join clause to the query
*
* @param {String} table - The table you are joining
* @param {String} cond - The join condition.
* @param {String} [type='inner'] - The type of join, which defaults to inner
* @return {QueryBuilder} - The Query Builder object, for chaining
*/
join (table, cond, type) {
type = type || 'inner';
// Prefix/quote table name
table = table.split(' ').map(Helpers.stringTrim);
table[0] = this.driver.quoteTable(table[0]);
table = table.map(this.driver.quoteIdentifiers);
table = table.join(' ');
// Parse out the join condition
const parsedCondition = this.parser.compileJoin(cond);
const condition = `${table} ON ${parsedCondition}`;
// Append the join condition to the query map
this._appendMap(`\n${type.toUpperCase()} JOIN `, condition, 'join');
return this;
}
/**
* Group the results by the selected field(s)
*
* @param {String|Array} field - The name of the field to group by
* @return {QueryBuilder} - The Query Builder object, for chaining
*/
groupBy (field) {
if (!Helpers.isScalar(field)) {
const newGroupArray = field.map(this.driver.quoteIdentifiers);
this.state.groupArray = this.state.groupArray.concat(newGroupArray);
} else {
this.state.groupArray.push(this.driver.quoteIdentifiers(field));
}
this.state.groupString = ` GROUP BY ${this.state.groupArray.join(',')}`;
return this;
}
/**
* Order the results by the selected field(s)
*
* @param {String} field - The field(s) to order by
* @param {String} [type='ASC'] - The order direction, ASC or DESC
* @return {QueryBuilder} - The Query Builder object, for chaining
*/
orderBy (field, type) {
type = type || 'ASC';
// Set the fields for later manipulation
field = this.driver.quoteIdentifiers(field);
this.state.orderArray[field] = type;
const orderClauses = [];
// Flatten key/val pairs into an array of space-separated pairs
Object.keys(this.state.orderArray).forEach(key => {
orderClauses.push(`${key} ${this.state.orderArray[key].toUpperCase()}`);
});
// Set the final string
this.state.orderString = ` ORDER BY ${orderClauses.join(', ')}`;
return this;
}
/**
* Put a limit on the query
*
* @param {Number} limit - The maximum number of rows to fetch
* @param {Number} [offset] - The row number to start from
* @return {QueryBuilder} - The Query Builder object, for chaining
*/
limit (limit, offset) {
this.state.limit = limit;
this.state.offset = offset || null;
return this;
}
/**
* Adds an open paren to the current query for logical grouping
*
* @return {QueryBuilder} - The Query Builder object, for chaining
*/
groupStart () {
const conj = (this.state.queryMap.length < 1) ? ' WHERE ' : ' AND ';
this._appendMap(conj, '(', 'groupStart');
return this;
}
/**
* Adds an open paren to the current query for logical grouping,
* prefixed with 'OR'
*
* @return {QueryBuilder} - The Query Builder object, for chaining
*/
orGroupStart () {
this._appendMap('', ' OR (', 'groupStart');
return this;
}
/**
* Adds an open paren to the current query for logical grouping,
* prefixed with 'OR NOT'
*
* @return {QueryBuilder} - The Query Builder object, for chaining
*/
orNotGroupStart () {
this._appendMap('', ' OR NOT (', 'groupStart');
return this;
}
/**
* Ends a logical grouping started with one of the groupStart methods
*
* @return {QueryBuilder} - The Query Builder object, for chaining
*/
groupEnd () {
this._appendMap('', ')', 'groupEnd');
return this;
}
// ------------------------------------------------------------------------
// ! Result Methods
// ------------------------------------------------------------------------
/**
* Get the results of the compiled query
*
* @param {String} [table] - The table to select from
* @param {Number} [limit] - A limit for the query
* @param {Number} [offset] - An offset for the query
* @example query.get('table_name').then(promiseCallback); // Get all the rows in the table
* @example query.get('table_name', 5); // Get 5 rows from the table
* @example query.get(); // Get the results of a query generated with other methods
* @return {Promise<Result>} - Promise containing the result of the query
*/
get (table, limit, offset) {
if (table) {
this.from(table);
}
if (limit) {
this.limit(limit, offset);
}
// Run the query
return this._run('get', table);
}
/**
* Run the generated insert query
*
* @param {String} table - The table to insert into
* @param {Object} [data] - Data to insert, if not already added with the 'set' method
* @return {Promise<Result>} - Promise containing the result of the query
*/
insert (table, data) {
if (data) {
this.set(data);
}
// Run the query
return this._run('insert', this.driver.quoteTable(table));
}
/**
* Insert multiple sets of rows at a time
*
* @param {String} table - The table to insert into
* @param {Array} data - The array of objects containing data rows to insert
* @example query.insertBatch('foo',[{id:1,val:'bar'},{id:2,val:'baz'}])
*.then(promiseCallback);
* @return {Promise<Result>} - Promise containing the result of the query
*/
insertBatch (table, data) {
const batch = this.driver.insertBatch(table, data);
// Run the query
return this.query(batch.sql, batch.values);
}
/**
* Run the generated update query
*
* @param {String} table - The table to insert into
* @param {Object} [data] - Data to insert, if not already added with the 'set' method
* @return {Promise<Result>} - Promise containing the result of the query
*/
update (table, data) {
if (data) {
this.set(data);
}
// Run the query
return this._run('update', this.driver.quoteTable(table));
}
/**
* Creates a batch update sql statement
*
* @param {String} table - The table to update
* @param {Object} data - Batch insert data
* @param {String} updateKey - The field in the table to compare against for updating
* @return {Number} Number of rows updated
*/
updateBatch (table, data, updateKey) {
const [sql, insertData, affectedRows] = this.driver.updateBatch(table, data, updateKey);
this._run('', table, sql, insertData);
return affectedRows;
}
/**
* Run the generated delete query
*
* @param {String} table - The table to insert into
* @param {Object} [where] - Where clause for delete statement
* @return {Promise<Result>} - Promise containing the result of the query
*/
delete (table, where) {
if (where) {
this.where(where);
}
// Run the query
return this._run('delete', this.driver.quoteTable(table));
}
// ------------------------------------------------------------------------
// ! Methods returning SQL
// ------------------------------------------------------------------------
/**
* Return generated select query SQL
*
* @param {String} [table] - the name of the table to retrieve from
* @param {Boolean} [reset=true] - Whether to reset the query builder so another query can be built
* @return {String} - The compiled sql statement
*/
getCompiledSelect (table, reset = true) {
if (table) {
this.from(table);
}
return this._getCompile('get', table, reset);
}
/**
* Return generated insert query SQL
*
* @param {String} table - the name of the table to insert into
* @param {Boolean} [reset=true] - Whether to reset the query builder so another query can be built
* @return {String} - The compiled sql statement
*/
getCompiledInsert (table, reset = true) {
return this._getCompile('insert', this.driver.quoteTable(table), reset);
}
/**
* Return generated update query SQL
*
* @param {String} table - the name of the table to update
* @param {Boolean} [reset=true] - Whether to reset the query builder so another query can be built
* @return {String} - The compiled sql statement
*/
getCompiledUpdate (table, reset = true) {
return this._getCompile('update', this.driver.quoteTable(table), reset);
}
/**
* Return generated delete query SQL
*
* @param {String} table - the name of the table to delete from
* @param {Boolean} [reset=true] - Whether to reset the query builder so another query can be built
* @return {String} - The compiled sql statement
*/
getCompiledDelete (table, reset = true) {
return this._getCompile('delete', this.driver.quoteTable(table), reset);
}
}
module.exports = QueryBuilder;