node-query/lib/QueryBuilder.js

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'use strict';
/** @module QueryBuilder */
let getArgs = require('getargs'),
helpers = require('./helpers'),
State = require('./State'),
QueryParser = require('./QueryParser');
module.exports = class QueryBuilder {
/*
* SQL generation object
*
* @param {driver} - The syntax driver for the database
* @param {adapter} - The database module adapter for running queries
* @return {QueryBuilder} - The Query Builder object, for chaining
* @constructor
*/
constructor(driver, adapter) {
this.driver = driver;
this.adapter = adapter;
this.parser = new QueryParser(this.driver);
this.state = new State();
}
/**
* Complete the sql building based on the type provided
*
* @private
* @param {String} type - Type of SQL query
* @param {String} table - The table to run the query on
* @return {String} - The compiled sql
*/
_compile(type, table) {
// Put together the basic query
let sql = this._compileType(type, table);
// Set each subClause
['queryMap', 'groupString', 'orderString', 'havingMap'].forEach(clause => {
let param = this.state[clause];
if ( ! helpers.isScalar(param))
{
Object.keys(param).forEach(part => {
sql += param[part].conjunction + param[part].string;
});
}
else
{
sql += param;
}
});
// Append the limit, if it exists
if (helpers.isNumber(this.state.limit))
{
sql = this.driver.limit(sql, this.state.limit, this.state.offset);
}
return sql;
}
_compileType(type, table) {
let sql = '';
switch(type) {
case "insert":
let params = Array(this.state.setArrayKeys.length).fill('?');
sql = `INSERT INTO ${table} (`;
sql += this.state.setArrayKeys.join(',');
sql += ") VALUES (";
sql += params.join(',') + ')';
break;
case "update":
sql = `UPDATE ${table} SET ${this.state.setString}`;
break;
case "delete":
sql = `DELETE FROM ${table}`;
break;
default:
sql = `SELECT * FROM ${this.state.fromString}`;
// Set the select string
if (this.state.selectString.length > 0)
{
// Replace the star with the selected fields
sql = sql.replace('*', this.state.selectString);
}
break;
}
return sql;
}
_like(field, val, pos, like, conj) {
field = this.driver.quoteIdentifiers(field);
like = `${field} ${like} ?`;
if (pos == 'before')
{
val = `%${val}`;
}
else if (pos == 'after')
{
val = `${val}%`;
}
else
{
val = `%${val}%`;
}
conj = (this.state.queryMap.length < 1) ? ' WHERE ' : ` ${conj} `;
this._appendMap(conj, like, 'like');
this.state.whereValues.push(val);
}
/**
* Append a clause to the query map
*
* @private
* @param {String} conjunction - linking keyword for the clause
* @param {String} string - pre-compiled sql fragment
* @param {String} type - type of sql clause
* @return {void}
*/
_appendMap(conjunction, string, type) {
this.state.queryMap.push({
type: type,
conjunction: conjunction,
string: string
});
}
/**
* Handle key/value pairs in an object the same way as individual arguments,
* when appending to state
*
* @private
* @return {Array} - modified state array
*/
_mixedSet(/* $letName, $valType, $key, [$val] */) {
let args = getArgs('$letName:string, $valType:string, $key:object|string|number, [$val]', arguments);
let obj = {};
if (helpers.isScalar(args.$key) && !helpers.isUndefined(args.$val))
{
// Convert key/val pair to a simple object
obj[args.$key] = args.$val;
}
else if (helpers.isScalar(args.$key) && helpers.isUndefined(args.$val))
{
// If just a string for the key, and no value, create a simple object with duplicate key/val
obj[args.$key] = args.$key;
}
else
{
obj = args.$key;
}
Object.keys(obj).forEach(k => {
// If a single value for the return
if (['key','value'].indexOf(args.$valType) !== -1)
{
let pushVal = (args.$valType === 'key') ? k : obj[k];
this.state[args.$letName].push(pushVal);
}
else
{
this.state[args.$letName][k] = obj[k];
}
});
return this.state[args.$letName];
}
_whereMixedSet(/*key, val*/) {
let args = getArgs('key:string|object, [val]', arguments);
this.state.whereMap = [];
this.state.rawWhereValues = [];
this._mixedSet('whereMap', 'both', args.key, args.val);
this._mixedSet('rawWhereValues', 'value', args.key, args.val);
}
_fixConjunction(conj) {
let lastItem = this.state.queryMap[this.state.queryMap.length - 1];
let conjunctionList = helpers.arrayPluck(this.state.queryMap, 'conjunction');
if (this.state.queryMap.length === 0 || ( ! helpers.regexInArray(conjunctionList, /^ ?WHERE/i)))
{
conj = " WHERE ";
}
else if (lastItem.type === 'groupStart')
{
conj = '';
}
else
{
conj = ' ' + conj + ' ';
}
return conj;
}
_where(key, val, defaultConj) {
// Normalize key and value and insert into this.state.whereMap
this._whereMixedSet(key, val);
// Parse the where condition to account for operators,
// functions, identifiers, and literal values
this.state = this.parser.parseWhere(this.driver, this.state);
this.state.whereMap.forEach(clause => {
let conj = this._fixConjunction(defaultConj);
this._appendMap(conj, clause, 'where');
});
this.state.whereMap = {};
}
_whereNull(field, stmt, conj) {
field = this.driver.quoteIdentifiers(field);
let item = field + ' ' + stmt;
this._appendMap(this._fixConjunction(conj), item, 'whereNull');
}
_having(/*key, val, conj*/) {
let args = getArgs('key:string|object, [val]:string|number, [conj]:string', arguments);
args.conj = args.conj || 'AND';
args.val = args.val || null;
// Normalize key/val and put in state.whereMap
this._whereMixedSet(args.key, args.val);
// Parse the having condition to account for operators,
// functions, identifiers, and literal values
this.state = this.parser.parseWhere(this.driver, this.state);
this.state.whereMap.forEach(clause => {
// Put in the having map
this.state.havingMap.push({
conjunction: (this.state.havingMap.length > 0) ? ` ${args.conj} ` : ' HAVING ',
string: clause
});
});
// Clear the where Map
this.state.whereMap = {};
}
_whereIn(/*key, val, inClause, conj*/) {
let args = getArgs('key:string, val:array, inClause:string, conj:string', arguments);
args.key = this.driver.quoteIdentifiers(args.key);
let params = new Array(args.val.length);
params.fill('?');
args.val.forEach(value => {
this.state.whereValues.push(value);
});
args.conj = (this.state.queryMap.length > 0) ? " " + args.conj + " " : ' WHERE ';
let str = args.key + " " + args.inClause + " (" + params.join(',') + ") ";
this._appendMap(args.conj, str, 'whereIn');
}
_run(type, table, callback, sql, vals) {
if ( ! sql)
{
sql = this._compile(type, table);
}
if ( ! vals)
{
vals = this.state.values.concat(this.state.whereValues);
}
//console.log(this.state);
//console.log(sql);
//console.log(vals);
//console.log(callback);
//console.log('------------------------');
// Reset the state so another query can be built
this._resetState();
// Pass the sql and values to the adapter to run on the database
this.adapter.execute(sql, vals, callback);
}
_getCompile(type, table, reset) {
reset = reset || false;
let sql = this._compile(type, table);
if (reset) this._resetState();
return sql;
}
_resetState() {
this.state = new State();
}
// ----------------------------------------------------------------------------
// ! Miscellaneous Methods
// ----------------------------------------------------------------------------
/**
* Reset the object state for a new query
*
* @memberOf QueryBuilder
* @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;
}
/**
* Closes the database connection for the current adapter
*
* @return {void}
*/
end() {
this.adapter.close();
}
// ------------------------------------------------------------------------
// ! Query Builder Methods
// ------------------------------------------------------------------------
/**
* Specify rows to select in the query
*
* @memberOf QueryBuilder
* @param {String|Array} fields - The fields to select from the current table
* @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 (field.match(/as/i))
{
fields[index] = field.split(/ as /i).map(helpers.stringTrim);
}
});
let 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
* @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]*/) {
let args = getArgs('key:string|object, [val]:string|number', arguments);
this._having(args.key, args.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]*/) {
let args = getArgs('key:string|object, [val]:string|number', arguments);
this._having(args.key, args.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} val - the array of items to search in
* @return {QueryBuilder} - The Query Builder object, for chaining
*/
whereIn(key, val) {
this._whereIn(key, val, 'IN', 'AND');
return this;
}
/**
* Set a 'or where in' clause
*
* @param {String} key - the field to search
* @param {Array} val - the array of items to search in
* @return {QueryBuilder} - The Query Builder object, for chaining
*/
orWhereIn(key, val) {
this._whereIn(key, val, 'IN', 'OR');
return this;
}
/**
* Set a 'where not in' clause
*
* @param {String} key - the field to search
* @param {Array} val - the array of items to search in
* @return {QueryBuilder} - The Query Builder object, for chaining
*/
whereNotIn(key, val) {
this._whereIn(key, val, 'NOT IN', 'AND');
return this;
}
/**
* Set a 'or where not in' clause
*
* @param {String} key - the field to search
* @param {Array} val - the array of items to search in
* @return {QueryBuilder} - The Query Builder object, for chaining
*/
orWhereNotIn(key, val) {
this._whereIn(key, val, '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
* @return {QueryBuilder} - The Query Builder object, for chaining
*/
set(/* $key, [$val] */) {
let args = getArgs('$key, [$val]', arguments);
// Set the appropriate state variables
this._mixedSet('setArrayKeys', 'key', args.$key, args.$val);
this._mixedSet('values', 'value', args.$key, args.$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
let parsedCondition = this.parser.compileJoin(cond);
let 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))
{
let 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;
let 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() {
let 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
* @param {Function} callback - A callback for receiving the result
* @return {void}
*/
get(/* [table], [limit], [offset], callback */) {
let args = getArgs('[table]:string, [limit]:number, [offset]:number, callback:function', arguments);
if (args.table) {
this.from(args.table);
}
if (args.limit) {
this.limit(args.limit, args.offset);
}
// Run the query
this._run('get', args.table, args.callback);
}
/**
* 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
* @param {Function} callback - Callback for handling response from the database
* @return {void}
*/
insert(/* table, data, callback */) {
let args = getArgs('table:string, [data]:object, callback:function', arguments);
if (args.data) {
this.set(args.data);
}
// Run the query
this._run('insert', this.driver.quoteTable(args.table), args.callback);
}
/**
* 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
* @param {Function} callback - Callback for handling database response
* @example query.insertBatch('foo',[{id:1,val:'bar'},{id:2,val:'baz'}], callbackFunction);
* @return {void}
*/
insertBatch(/* table, data, callback */) {
let args = getArgs('table:string, data:array, callback:function', arguments);
let batch = this.driver.insertBatch(args.table, args.data);
// Run the query
this._run('', '', args.callback, 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
* @param {Function} callback - Callback for handling response from the database
* @return {void}
*/
update(/*table, data, callback*/) {
let args = getArgs('table:string, [data]:object, callback:function', arguments);
if (args.data) {
this.set(args.data);
}
// Run the query
this._run('update', this.driver.quoteTable(args.table), args.callback);
}
/**
* Run the generated delete query
*
* @param {String} table - The table to insert into
* @param {Object} [where] - Where clause for delete statement
* @param {Function} callback - Callback for handling response from the database
* @return {void}
*/
delete(/*table, [where], callback*/) {
let args = getArgs('table:string, [where]:object, callback:function', arguments);
if (args.where)
{
this.where(args.where);
}
// Run the query
this._run('delete', this.driver.quoteTable(args.table), args.callback);
}
// ------------------------------------------------------------------------
// ! 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*/) {
let args = getArgs('[table]:string, [reset]:boolean', arguments);
if (args.table)
{
this.from(args.table);
}
return this._getCompile('get', args.table, args.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) {
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) {
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) {
return this._getCompile('delete', this.driver.quoteTable(table), reset);
}
}