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index.js
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/**
* MOST Web Framework
* A JavaScript Web Framework
* http://themost.io
* Created by Kyriakos Barbounakis<k.barbounakis@gmail.com> on 2014-02-03.
*
* Copyright (c) 2014, Kyriakos Barbounakis k.barbounakis@gmail.com
Anthi Oikonomou anthioikonomou@gmail.com
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
* Neither the name of MOST Web Framework nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* @private
*/
var JDBC = require('jdbc'),
jinst = require('jdbc/lib/jinst'),
async = require('async'),
util = require('util'),
path = require('path'),
qry = require('most-query');
if (!jinst.isJvmCreated()) {
jinst.addOption("-Xrs");
jinst.setupClasspath([ path.resolve(__dirname, './drivers/h2-latest.jar')]);
}
/**
* @class
* @constructor
* @param {*|{path:string,database:string,host:string,port:number,user:string,password:string,pool:number}} options
* @augments DataAdapter
*/
function H2Adapter(options)
{
/**
* @private
* @type {Connection}
*/
this.rawConnection = null;
if (typeof options === 'undefined' || options == null) {
throw new Error("Data adapter options may not be empty.");
}
this.getOptions = function() {
var result;
//build URL
if (typeof options.path === 'string') {
result = {
url : util.format("jdbc:h2:%s;AUTO_SERVER=true;AUTO_RECONNECT=true", options.path),
minpoolsize:1,
maxpoolsize: typeof options.pool === 'number' ? options.pool : 25,
properties : {
"user" : options.user,
"password": options.password
}
};
return result;
}
else if (typeof options.host === 'string') {
var host_ = options.port ? options.host + ":" + options.port : options.host;
result = {
url : util.format("jdbc:h2:tcp://%s/%s;AUTO_RECONNECT=true", host_, options.database),
minpoolsize:1,
maxpoolsize: typeof options.pool === 'number' ? options.pool : 25,
properties : {
"user" : options.user,
"password": options.password
}
};
return result;
}
else {
throw new Error("Database path or host may not be empty.");
}
}
}
/**
* @returns {string}
* @private
*/
function getTimezone_() {
var offset = (new Date()).getTimezoneOffset();
return (offset<=0 ? '+' : '-') + zeroPad(-Math.floor(offset/60),2) + ':' + zeroPad(offset%60,2);
}
/**
*
* @param {Function} callback
* @private
*/
function getDatabaseTimezone_(callback) {
return this.execute('SELECT FORMATDATETIME(CURRENT_TIMESTAMP(),\'XXX\') as "timezone"', null, function (err, result) {
if (err) { return callback(err); }
return callback(null, result[0]["timezone"]);
});
}
/**
* Opens database connection
*/
H2Adapter.prototype.open = function(callback)
{
callback = callback || function() {};
var self = this;
if (self.rawConnection) {
return callback();
}
H2Adapter.pools = H2Adapter.pools || { };
//get connection options
var options = this.getOptions(), connectionPool;
if (H2Adapter.pools.hasOwnProperty(options.url)) {
connectionPool=H2Adapter.pools[options.url];
connectionPool.reserve(function(err, connObj) {
if (err) { return callback(err); }
self.rawConnection = connObj;
return callback();
});
}
else {
connectionPool = new JDBC(self.getOptions());
H2Adapter.pools[options.url] = connectionPool;
connectionPool.initialize(function(err) {
if (err) { return callback(err); }
connectionPool.reserve(function(err, connObj) {
if (err) { return callback(err); }
self.rawConnection = connObj;
return callback();
});
});
}
};
/**
* @param {function(Error=)} callback
*/
H2Adapter.prototype.close = function(callback) {
var self = this;
callback = callback || function() {};
if (typeof self.rawConnection === 'undefined' || self.rawConnection == null) {
return callback();
}
H2Adapter.pools = H2Adapter.pools || { };
var options = this.getOptions(),
connectionPool=H2Adapter.pools[options.url];
if (typeof connectionPool === 'undefined' || connectionPool == null) {
return callback(new Error("Connection pool may not be empty at this context."))
}
connectionPool.release(self.rawConnection, function(err) {
if (err) {
console.log(err);
}
self.rawConnection=null;
return callback();
});
};
/**
* Begins a data transaction and executes the given function
* @param fn {Function}
* @param callback {Function}
*/
H2Adapter.prototype.executeInTransaction = function(fn, callback)
{
var self = this;
//ensure callback
callback = callback || function () {};
//ensure that database connection is open
self.open(function(err) {
if (err) {
return callback(err);
}
//execution is already in transaction
if (self.transaction_) {
//so invoke method
fn.call(self, function(err)
{
//call callback
return callback(err);
});
}
else {
//set auto commit to off
return self.rawConnection.conn.setAutoCommit(false, function() {
if (err) { return callback(err); }
//set savepoint
self.transaction_ = true;
try {
//invoke method
fn.call(self, function(error)
{
if (error) {
self.rawConnection.conn.rollback(function(err) {
if (err) {
//log transaction rollback error
util.log("An error occured while rolling back savepoint.");
util.log(err);
}
delete self.transaction_;
return self.rawConnection.conn.setAutoCommit(true, function() {
return callback(error);
});
});
}
else {
self.rawConnection.conn.commit(function(err) {
delete self.transaction_;
return self.rawConnection.conn.setAutoCommit(true, function() {
return callback(err);
});
});
}
});
}
catch(e) {
self.rawConnection.conn.rollback(function(err) {
if (err) {
//log transaction rollback error
util.log("An error occured while rolling back savepoint.");
util.log(err);
}
delete self.transaction_;
return self.rawConnection.conn.setAutoCommit(true, function() {
return callback(e);
});
});
}
});
}
});
};
/**
* Executes an operation against database and returns the results.
* @param batch {*}
* @param callback {Function}
*/
H2Adapter.prototype.executeBatch = function(batch, callback) {
callback = callback || function() {};
callback(new Error('DataAdapter.executeBatch() is obsolete. Use DataAdapter.executeInTransaction() instead.'));
};
/**
* Produces a new identity value for the given entity and attribute.
* @param entity {String} The target entity name
* @param attribute {String} The target attribute
* @param callback {Function=}
*/
H2Adapter.prototype.selectIdentity = function(entity, attribute , callback) {
var self = this;
var migration = {
appliesTo:'increment_id',
model:'increments',
description:'Increments migration (version 1.0)',
version:'1.0',
add:[
{ name:'id', type:'Counter', primary:true },
{ name:'entity', type:'Text', size:120 },
{ name:'attribute', type:'Text', size:120 },
{ name:'value', type:'Integer' }
]
};
//ensure increments entity
self.migrate(migration, function(err)
{
//throw error if any
if (err) { callback.call(self,err); return; }
self.execute('SELECT * FROM "increment_id" WHERE "entity"=? AND "attribute"=?', [entity, attribute], function(err, result) {
if (err) { callback.call(self,err); return; }
if (result.length==0) {
//get max value by querying the given entity
var q = qry.query(entity).select([qry.fields.max(attribute)]);
self.execute(q,null, function(err, result) {
if (err) { callback.call(self, err); return; }
var value = 1;
if (result.length>0) {
value = parseInt(result[0][attribute]) + 1;
}
self.execute('INSERT INTO "increment_id"("entity", "attribute", "value") VALUES (?,?,?)',[entity, attribute, value], function(err) {
//throw error if any
if (err) { callback.call(self, err); return; }
//return new increment value
callback.call(self, err, value);
});
});
}
else {
//get new increment value
var value = parseInt(result[0].value) + 1;
self.execute('UPDATE "increment_id" SET "value"=? WHERE "id"=?',[value, result[0].id], function(err) {
//throw error if any
if (err) { callback.call(self, err); return; }
//return new increment value
callback.call(self, err, value);
});
}
});
});
};
H2Adapter.prototype.lastIdentity = function(callback) {
var self = this;
self.open(function(err) {
if (err) {
callback(err);
}
else {
self.execute('SELECT SCOPE_IDENTITY() as "lastval"', [], function(err, result) {
if (err) {
callback(null, { insertId: null });
}
else {
result = result || [];
if (result.length>0)
callback(null, { insertId:parseInt(result[0]["lastval"]) });
else
callback(null, { insertId: null });
}
});
}
});
};
/**
* @param query {*}
* @param values {*}
* @param {function} callback
*/
H2Adapter.prototype.execute = function(query, values, callback) {
var self = this, sql = null;
try {
if (typeof query == 'string') {
sql = query;
}
else {
//format query expression or any object that may be act as query expression
var formatter = new H2Formatter();
formatter.settings.nameFormat = H2Adapter.NAME_FORMAT;
sql = formatter.format(query);
}
//validate sql statement
if (typeof sql !== 'string') {
callback.call(self, new Error('The executing command is of the wrong type or empty.'));
return;
}
//ensure connection
self.open(function(err) {
if (err) {
callback.call(self, err);
}
else {
var startTime;
if (process.env.NODE_ENV==='development') {
startTime = new Date().getTime();
}
//execute raw command
var str = qry.prepare(sql, values);
self.rawConnection.conn.createStatement(function(err, statement) {
if (err) { return callback(err); }
var executeQuery = statement.executeQuery;
if (!/^SELECT/i.test(str)) {
executeQuery = statement.executeUpdate;
}
executeQuery.call(statement, str, function(err, result) {
if (process.env.NODE_ENV==='development') {
console.log(util.format('SQL (Execution Time:%sms):%s, Parameters:%s', (new Date()).getTime()-startTime, sql, JSON.stringify(values)));
}
if (err) {
return callback(err);
}
if (typeof result.toObjArray === 'function') {
result.toObjArray(function(err, results) {
return callback(null, results);
});
}
else {
return callback(null, result);
}
});
});
}
});
}
catch (e) {
callback.call(self, e);
}
};
/**
* Formats an object based on the format string provided. Valid formats are:
* %t : Formats a field and returns field type definition
* %f : Formats a field and returns field name
* @param format {string}
* @param obj {*}
*/
H2Adapter.format = function(format, obj)
{
var result = format;
if (/%t/.test(format))
result = result.replace(/%t/g,H2Adapter.formatType(obj));
if (/%f/.test(format))
result = result.replace(/%f/g,obj.name);
return result;
};
H2Adapter.formatType = function(field)
{
var size = parseInt(field.size);
var scale = parseInt(field.scale);
var s = 'VARCHAR(512) NULL';
var type=field.type;
switch (type)
{
case 'Boolean':
s = 'BOOLEAN';
break;
case 'Byte':
s = 'TINYINT';
break;
case 'Number':
case 'Float':
s = 'REAL';
break;
case 'Counter':
return 'INT AUTO_INCREMENT NOT NULL';
case 'Currency':
s = 'DECIMAL(19,4)';
break;
case 'Decimal':
s = util.format('DECIMAL(%s,%s)', (size>0 ? size : 19),(scale>0 ? scale : 8));
break;
case 'Date':
s = 'DATE';
break;
case 'DateTime':
s = 'TIMESTAMP';
break;
case 'Time':
s = 'TIME';
break;
case 'Integer':
s = 'INTEGER';
break;
case 'Duration':
s = size>0 ? util.format('VARCHAR(%s)', size) : 'VARCHAR(36)';
break;
case 'BigInteger':
s = 'BIGINT';
break;
case 'URL':
s = size>0 ? util.format('VARCHAR(%s)', size) : 'VARCHAR(512)';
break;
case 'Text':
s = size>0 ? util.format('VARCHAR(%s)', size) : 'VARCHAR(512)';
break;
case 'Note':
s = size>0 ? util.format('VARCHAR(%s)', size) : 'CLOB';
break;
case 'Image':
case 'Binary':
s = size > 0 ? util.format('BLOB(%s)', size) : 'BLOB';
break;
case 'Guid':
s = 'VARCHAR(36)';
break;
case 'Short':
s = 'SMALLINT';
break;
default:
s = 'INTEGER';
break;
}
s += typeof (field.nullable=== 'undefined') ? ' null': (field.nullable==true || field.nullable == 1) ? ' NULL': ' NOT NULL';
return s;
};
/**
* @param {string} name
* @param {QueryExpression} query
* @param {function(Error=)} callback
*/
H2Adapter.prototype.createView = function(name, query, callback) {
this.view(name).create(query, callback);
};
/**
*
* @param {DataModelMigration|*} obj - An Object that represents the data model scheme we want to migrate
* @param {function(Error=,*=)} callback
*/
H2Adapter.prototype.migrate = function(obj, callback) {
if (obj==null)
return;
var self = this;
var migration = obj;
if (migration.appliesTo==null)
throw new Error("Model name is undefined");
self.open(function(err) {
if (err) {
callback.call(self, err);
}
else {
var db = self.rawConnection;
async.waterfall([
//1. Check migrations table existence
function(cb) {
self.table('migrations').exists(function(err, exists) {
if (err) { return cb(err); }
cb(null, exists);
});
},
//2. Create migrations table if not exists
function(arg, cb) {
if (arg>0) { return cb(null, 0); }
self.table('migrations').create([
{ name:'id', type:'Counter', primary:true, nullable:false },
{ name:'appliesTo', type:'Text', size:'80', nullable:false },
{ name:'model', type:'Text', size:'120', nullable:true },
{ name:'description', type:'Text', size:'512', nullable:true },
{ name:'version', type:'Text', size:'40', nullable:false }
], function(err) {
if (err) { return cb(err); }
cb(null,0);
});
},
//3. Check if migration has already been applied
function(arg, cb) {
self.execute('SELECT COUNT(*) AS "count" FROM "migrations" WHERE "appliesTo"=? and "version"=?',
[migration.appliesTo, migration.version], function(err, result) {
if (err) { return cb(err); }
cb(null, result[0].count);
});
},
//4a. Check table existence
function(arg, cb) {
//migration has already been applied (set migration.updated=true)
if (arg>0) { obj['updated']=true; cb(null, -1); return; }
self.table(migration.appliesTo).exists(function(err, exists) {
if (err) { return cb(err); }
cb(null, exists);
});
},
//4b. Migrate target table (create or alter)
function(arg, cb) {
//migration has already been applied
if (arg<0) { return cb(null, arg); }
if (arg==0) {
//create table
return self.table(migration.appliesTo).create(migration.add, function(err) {
if (err) { return cb(err); }
cb(null, 1);
});
}
//columns to be removed (unsupported)
if (util.isArray(migration.remove)) {
if (migration.remove.length>0) {
return cb(new Error('Data migration remove operation is not supported by this adapter.'));
}
}
//columns to be changed (unsupported)
if (util.isArray(migration.change)) {
if (migration.change.length>0) {
return cb(new Error('Data migration change operation is not supported by this adapter. Use add collection instead.'));
}
}
var column, newType, oldType;
if (util.isArray(migration.add)) {
//init change collection
migration.change = [];
//get table columns
self.table(migration.appliesTo).columns(function(err, columns) {
if (err) { return cb(err); }
for (var i = 0; i < migration.add.length; i++) {
var x = migration.add[i];
column = columns.find(function(y) { return (y.name===x.name); });
if (column) {
//if column is primary key remove it from collection
if (column.primary) {
migration.add.splice(i, 1);
i-=1;
}
else {
//get new type
newType = H2Adapter.format('%t', x);
//get old type
oldType = column.type1.replace(/\s+$/,'') + ((column.nullable==true || column.nullable == 1) ? ' NULL' : ' NOT NULL');
//remove column from collection
migration.add.splice(i, 1);
i-=1;
if (newType !== oldType) {
//add column to alter collection
migration.change.push(x);
}
}
}
}
//alter table
var targetTable = self.table(migration.appliesTo);
//add new columns (if any)
targetTable.add(migration.add, function(err) {
if (err) { return cb(err); }
//modify columns (if any)
targetTable.change(migration.change, function(err) {
if (err) { return cb(err); }
cb(null, 1);
});
});
});
}
else {
cb(new Error('Invalid migration data.'));
}
},
//Apply data model foreign keys
function (arg, cb) {
if (arg<=0) { return cb(null, arg); }
if (migration.constraints) {
var tableForeignKeys = self.foreignKeys(migration.appliesTo);
//enumerate migration constraints
async.eachSeries(migration.constraints, function(constraint, constraintCallback) {
//if constraint is a foreign key constraint
if (constraint.type === 'foreignKey') {
//create table foreign key
return tableForeignKeys.create(constraint.foreignKeyField,
constraint.primaryKeyTable,
constraint.primaryKeyField,
constraintCallback);
}
else {
//else do nothing
return constraintCallback();
}
}, function(err) {
//throw error
if (err) { return cb(err); }
//or return success flag
return cb(null, 1);
});
}
else {
//do nothing and exit
return cb(null, 1);
}
},
//Apply data model indexes
function (arg, cb) {
if (arg<=0) { return cb(null, arg); }
if (migration.indexes) {
var tableIndexes = self.indexes(migration.appliesTo);
//enumerate migration constraints
async.eachSeries(migration.indexes, function(index, indexCallback) {
tableIndexes.create(index.name, index.columns, indexCallback);
}, function(err) {
//throw error
if (err) { return cb(err); }
//or return success flag
return cb(null, 1);
});
}
else {
//do nothing and exit
return cb(null, 1);
}
}, function(arg, cb) {
if (arg>0) {
//log migration to database
self.execute('INSERT INTO "migrations" ("appliesTo","model","version","description") VALUES (?,?,?,?)', [migration.appliesTo,
migration.model,
migration.version,
migration.description ], function(err) {
if (err) { return cb(err); }
return cb(null, 1);
});
}
else
cb(null, arg);
}
], function(err, result) {
callback(err, result);
});
}
});
};
H2Adapter.prototype.table = function(name) {
var self = this;
return {
/**
* @param {function(Error,Boolean=)} callback
*/
exists:function(callback) {
callback = callback || function() {};
self.execute('SELECT COUNT(*) AS "count" FROM information_schema.TABLES WHERE TABLE_NAME=? AND TABLE_SCHEMA=?',
[ name, 'PUBLIC' ], function(err, result) {
if (err) { return callback(err); }
callback(null, result[0].count);
});
},
/**
* @param {function(Error,string=)} callback
*/
version:function(callback) {
callback = callback || function() {};
self.execute('SELECT MAX("version") AS "version" FROM "migrations" WHERE "appliesTo"=?',
[name], function(err, result) {
if (err) { return callback(err); }
if (result.length==0)
callback(null, '0.0');
else
callback(null, result[0].version || '0.0');
});
},
/**
* @param {function(Error=,Array=)} callback
*/
columns:function(callback) {
callback = callback || function() {};
self.execute('SELECT COLUMN_NAME AS "name", TYPE_NAME as "type",CHARACTER_MAXIMUM_LENGTH as "size", ' +
'CASE WHEN IS_NULLABLE=\'YES\' THEN 1 ELSE 0 END AS "nullable", NUMERIC_PRECISION as "precision",' +
'NUMERIC_SCALE as "scale" ,(SELECT COUNT(*) FROM information_schema.INDEXES WHERE TABLE_CATALOG="c".TABLE_CATALOG AND TABLE_SCHEMA="c".TABLE_SCHEMA AND TABLE_NAME="c".TABLE_NAME ' +
'AND PRIMARY_KEY=true AND COLUMN_NAME="c".COLUMN_NAME) AS "primary" ,CONCAT(TYPE_NAME, (CASE WHEN "NULLABLE" = 0 THEN \' NOT NULL\' ELSE \'\' END)) ' +
'AS "type1" FROM information_schema.COLUMNS AS "c" WHERE TABLE_NAME=? AND TABLE_SCHEMA=?',
[ name, 'PUBLIC' ], function(err, result) {
if (err) { return callback(err); }
callback(null, result);
});
},
/**
* @param {{name:string,type:string,primary:boolean|number,nullable:boolean|number,size:number, scale:number,precision:number,oneToMany:boolean}[]|*} fields
* @param callback
*/
create: function(fields, callback) {
callback = callback || function() {};
fields = fields || [];
if (!util.isArray(fields)) {
return callback(new Error('Invalid argument type. Expected Array.'))
}
if (fields.length == 0) {
return callback(new Error('Invalid argument. Fields collection cannot be empty.'))
}
var strFields = fields.filter(function(x) {
return !x.oneToMany;
}).map(
function(x) {
return H2Adapter.format('"%f" %t', x);
}).join(', ');
//add primary key constraint
var strPKFields = fields.filter(function(x) { return (x.primary == true || x.primary == 1); }).map(function(x) {
return H2Adapter.format('"%f"', x);
}).join(', ');
if (strPKFields.length>0) {
strFields += ', ' + util.format('PRIMARY KEY (%s)', strPKFields);
}
var sql = util.format('CREATE TABLE "%s" (%s)', name, strFields);
self.execute(sql, null, function(err) {
callback(err);
});
},
/**
* Alters the table by adding an array of fields
* @param {{name:string,type:string,primary:boolean|number,nullable:boolean|number,size:number,oneToMany:boolean}[]|*} fields
* @param callback
*/
add:function(fields, callback) {
callback = callback || function() {};
callback = callback || function() {};
fields = fields || [];
if (!util.isArray(fields)) {
//invalid argument exception
return callback(new Error('Invalid argument type. Expected Array.'))
}
if (fields.length == 0) {
//do nothing
return callback();
}
var formatter = new H2Formatter();
var strTable = formatter.escapeName(name);
//generate SQL statement
var sql = fields.map(function(x) {
return H2Adapter.format('ALTER TABLE ' + strTable + ' ADD "%f" %t', x);
}).join(';');
self.execute(sql, [], function(err) {
callback(err);
});
},
/**
* Alters the table by modifying an array of fields
* @param {{name:string,type:string,primary:boolean|number,nullable:boolean|number,size:number,oneToMany:boolean}[]|*} fields
* @param callback
*/
change:function(fields, callback) {
callback = callback || function() {};
callback = callback || function() {};
fields = fields || [];
if (!util.isArray(fields)) {
//invalid argument exception
return callback(new Error('Invalid argument type. Expected Array.'))
}
if (fields.length == 0) {
//do nothing
return callback();
}
var formatter = new H2Formatter();
var strTable = formatter.escapeName(name);
//generate SQL statement
var sql = fields.map(function(x) {
return H2Adapter.format('ALTER TABLE ' + strTable + ' ALTER COLUMN "%f" %t', x);
}).join(';');
self.execute(sql, [], function(err) {
callback(err);
});
}
}
};
H2Adapter.prototype.view = function(name) {
var self = this, owner, view;
var matches = /(\w+)\.(\w+)/.exec(name);
if (matches) {
//get schema owner
owner = matches[1];
//get table name
view = matches[2];
}
else {
view = name;
}
return {
/**
* @param {function(Error,Boolean=)} callback
*/
exists:function(callback) {
var sql = 'SELECT COUNT(*) AS "count" FROM information_schema.TABLES WHERE TABLE_NAME=? AND TABLE_TYPE=\'VIEW\' AND TABLE_SCHEMA=?';
self.execute(sql, [name, 'PUBLIC'], function(err, result) {
if (err) { callback(err); return; }
callback(null, (result[0].count>0));
});
},
/**
* @param {function(Error=)} callback
*/
drop:function(callback) {
callback = callback || function() {};
self.open(function(err) {
if (err) { return callback(err); }
var sql = 'SELECT COUNT(*) AS "count" FROM information_schema.TABLES WHERE TABLE_NAME=? AND TABLE_TYPE=\'VIEW\' AND TABLE_SCHEMA=?';
self.execute(sql, [name, 'PUBLIC'], function(err, result) {
if (err) { return callback(err); }
var exists = (result[0].count>0);
if (exists) {
var sql = util.format('DROP VIEW "%s"',name);
self.execute(sql, undefined, function(err) {
if (err) { callback(err); return; }
callback();
});
}
else {
callback();
}
});
});
},
/**
* @param {QueryExpression|*} q
* @param {function(Error=)} callback
*/
create:function(q, callback) {
var thisArg = this;
self.executeInTransaction(function(tr) {
thisArg.drop(function(err) {
if (err) { tr(err); return; }
try {
var sql = util.format('CREATE VIEW "%s" AS ',name);
var formatter = new H2Formatter();
sql += formatter.format(q);
self.execute(sql, [], tr);
}
catch(e) {
tr(e);
}
});
}, function(err) {
callback(err);
});
}
};
};
H2Adapter.prototype.indexes = function(table) {
var self = this, formatter = new H2Formatter();
return {
list: function (callback) {
self.execute('SELECT INDEX_NAME as "indexName", TABLE_NAME as "tableName", COLUMN_NAME as "columnName" FROM "INFORMATION_SCHEMA".INDEXES ' +
'WHERE TABLE_NAME=? AND TABLE_SCHEMA=? AND INDEX_TYPE_NAME=\'INDEX\'', [ table, 'PUBLIC'] , function (err, result) {
if (err) { return callback(err); }
var indexes = [];
result.forEach(function(x) {
var ix = indexes.find(function(y) {
return y.name === x.indexName;
});
if (ix) {
ix.columns.push(x.columnName);
}
else {
indexes.push({
name:x.indexName,
columns: [ x.columnName ]
})
}
});
return callback(null, indexes);
});
},
/**
* @param {string} name
* @param {Array|string} columns
* @param {Function} callback
*/
create: function(name, columns, callback) {
var cols = [];
if (typeof columns === 'string') {
cols.push(columns)
}
else if (util.isArray(columns)) {
cols.push.apply(cols, columns);
}
else {
return callback(new Error("Invalid parameter. Columns parameter must be a string or an array of strings."));
}
this.list(function(err, indexes) {
if (err) { return callback(err); }
var ix = indexes.find(function(x) { return x.name === name; });
//format create index SQL statement
var sqlCreateIndex = util.format("CREATE INDEX %s ON %s(%s)",
formatter.escapeName(name),
formatter.escapeName(table),
cols.map(function(x) {
return formatter.escapeName(x)
}).join(","));
if (typeof ix === 'undefined' || ix == null) {
self.execute(sqlCreateIndex, [], callback);
}
else {
var nCols = cols.length;
//enumerate existing columns
ix.columns.forEach(function(x) {
if (cols.indexOf(x)>=0) {
//column exists in index
nCols -= 1;
}
});
if (nCols>0) {
//drop index
this.drop(name, function(err) {
if (err) { return callback(err); }
//and create it
self.execute(sqlCreateIndex, [], callback);
});
}
else {
//do nothing
return callback();
}
}
});
},
drop: function(name, callback) {