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435 lines (299 loc) · 10.7 KB
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/* @class AD_Server.Model.Datastore.Datastore_MySQL
* @parent AD_Server.Model.Datastore
*
* Implements a DataStore that is backedup by a MySQL db.
*/
var __doc;
// reuse the shared DB of our site:
var myDB = require(__appdevPath+'/server/database.js').sharedDB();
exports.DB = myDB;
var create = function (dataMgr, callback) {
// return a new instance of our DB.
var dbTable = dataMgr.dbTable;
var dbName = dataMgr.dbName || AD.Defaults.dbName;
var columns = '';
var values = [];
var valuesText = '';
for (var key in dataMgr.model) {
if (columns != '') columns += ', ';
columns += key;
values.push( dataMgr.model[key]);
if (valuesText != '') valuesText += ', ';
valuesText += '?';
}
// var sql = 'INSERT INTO '+dbName+'.'+dbTable+' ('+ columns + ') VALUES ('+valuesText + ')';
var sql = ['INSERT INTO ',dbName,'.',dbTable,' (', columns , ') VALUES (',valuesText , ')'].join('');
//console.log('-------');
//console.log('sql:'+sql);
//console.log('values:');
//console.log(values);
myDB.query(sql, values, function( err, info) {
if (err) {
console.log(err);
console.log('sql:'+sql);
console.log('values:');
console.log(values);
}
//// on a create operation, we return the new ID of the object:
var insertID = -1;
if (undefined !== info) {
if (undefined !== info.insertId) {
insertID = info.insertId;
}
}
callback( err, insertID );
});
}
exports.create = create;
var validOperations = {
'=':'=',
'!=':'!=',
'like':' like ',
'!like':' not like ',
'>': '>',
'>=': '>=',
'<' : '<',
'<=': '<=',
// 'in': ' in '
}
var valueConversions = {
'in': function(value) {
if ('array' == typeof value) return '(' + array.join(',') + ')';
return '(' + value + ')';
}
}
var conditionParse = function(fieldName, obj, values) {
/*
{
'>=':1,
'<=':10,
'>' :3,
'<' :7,
'!=':6,
'in':[ 5, 6, 7],
'=' : 5,
'or':{
field:{
'=':
}
}
}
*/
var conditions = [];
// foreach op in obj
for (var k in obj) {
// if it is valid Operation
if ('undefined' != typeof validOperations[k]) {
var op = validOperations[k];
var val = obj[k];
if ('undefined' != typeof valueConversions[k]) val = valueConversions[k](val);
conditions.push( fieldName + op + '?');
values.push(val);
///// TODO: use node-validator to .xss() the inputs to 'in', so we can place them in the condition
///// directly: fieldName + ' IN ( ' + check(values.join(',')).xss() + ')';
}
}
var condition = conditions.join(' AND ');
if ('undefined' != typeof obj['or']) {
var newSet = obj.or;
var thisCondition = conditionParse(fieldName, obj[k], values);
condition = '('+condition+') OR ' + thisCondition;
}
return '(' + condition + ')';
}
var read = function (dataMgr, callback) {
// return a new instance of our DB.
//console.log('--- dataStore.MySQL.read(): dataMgr ---');
//console.log(dataMgr);
var dbTable = dataMgr.dbTable;
var conditions = [];
if (dataMgr.cond) conditions.push(dataMgr.cond);
var values = [];
// Which fields to retrieve?
var select = '*';
if (!dataMgr.selectedFields._empty) {
delete dataMgr.selectedFields._empty;
select = '';
for (var key in dataMgr.selectedFields) {
// These fields all have a tref prepended
if (select != '') select += ', ';
select += dataMgr.selectedFields[key].tref+'.'+key;
}
}
// Any JOINs required?
var tableName = dataMgr.dbName+'.'+dbTable;
if (dataMgr.joinedTables.length > 0) {
tableName += ' AS p';
tableName += getJoinedTables(dataMgr.dbName, dataMgr.joinedTables, 'p', values);
}
//console.log('model:');
//console.log(dataMgr);
var conditionObj = AD.Model.Condition(dataMgr.model);
/*
// Build up the condition (WHERE) from the model
for (var key in dataMgr.model) {
// if (condition != '') condition += ' AND ';
var value = dataMgr.model[key];
var fieldName = key;
var op = '=';
//console.log('typeof dataMgr.model[]:'+typeof dataMgr.model[key]);
if ((typeof dataMgr.model[key] == 'object') && (value !== null)) {
// this is not a simple key = value condition:
//// NOTE:
//// values related to table joins will look like: { value:'xxx', tref:'yyy' }
//// values related to complex conditions will look like: { '=':value1, '>':value2', ... }
// if this was a table join op
if ('undefined' != typeof value.tref) {
// More work needed
value = dataMgr.model[key].value;
if (typeof dataMgr.model[key].tref != 'undefined') {
fieldName = dataMgr.model[key].tref+'.'+fieldName;
}
// add the condition & values
conditions.push(fieldName+op+'?');
values.push( value );
} else {
// compile complex condition
var thisValues = [];
var thisCondition = conditionParse(fieldName, value, thisValues);
//console.log('');
//console.log(' :::: thisCondition :::');
//console.log(thisCondition);
//console.log('values:');
//console.log(thisValues);
conditions.push(thisCondition);
values = values.concat(thisValues);
}
} else {
// add the condition & values
conditions.push(fieldName+op+'?');
values.push( value );
}
}
*/
var condition=conditionObj.sql();
values = values.concat(conditionObj.values());
// if (conditions.length > 0) condition = conditions.join(' AND ');
var sql = 'SELECT '+select+' FROM '+tableName;
if (condition != '') sql += ' WHERE ' + condition;
//console.log('dataStore.read() : sql['+sql+']');
//console.log('dataStore.read() : values --');
//console.log(values);
myDB.query(sql, values, function( err, results, fields) {
if (err) {
console.log('datastore_MySQL.read(): error:');
console.log('sql: '+ sql);
console.log('values:');
console.log(values);
console.log();
}
callback( err, results, fields );
});
}
exports.read = read;
var getJoinedTables = function getJoinedTables (dbName, joinedTables, joinToTref, values) {
var joinedTableString = '';
for (var i = 0; i < joinedTables.length; i++ ) {
var table = joinedTables[i];
if (table.joinToTref == joinToTref) {
// Call recursively to look for other tables joined to this one
var lowerTables = getJoinedTables(dbName, joinedTables, table.tref, values);
var open = (lowerTables == '') ? '' : '(';
var close = (lowerTables == '') ? '' : ')';
joinedTableString += ' ' + table.type+' JOIN '+open;
joinedTableString += dbName+'.'+table.tableName;
joinedTableString += ' AS '+table.tref;
joinedTableString += lowerTables+close;
joinedTableString += ' ON '+table.joinToTref+'.'+table.foreignKey;
joinedTableString += ' = '+table.tref+'.'+ (table.referencedKey || table.foreignKey);
if (typeof table.condition != 'undefined') {
for (var j = 0; j < table.condition.length; j++ ) {
var condition = table.condition[j];
joinedTableString += ' AND '+condition.tref+'.'+condition.key+'=?';
values.push(condition.value);
}
}
}
}
return joinedTableString;
}
var runSQL = function (sql, values, callback) {
// just run the sql and return .
myDB.query(sql, values, function( err, results, fields) {
callback( err, results, fields );
});
}
exports.runSQL = runSQL;
var update = function (dataMgr, callback) {
var dbTable = dataMgr.dbTable;
var dbName = dataMgr.dbName || AD.Defaults.dbName;
//console.log(dataMgr);
var condition = [];
if((undefined !== dataMgr.cond) && (dataMgr.cond != '')) condition.push(dataMgr.cond);
var values = [];
var fieldValues = '';
for (var key in dataMgr.model) {
if (fieldValues != '') fieldValues += ', ';
fieldValues += key+'=?';
values.push( dataMgr.model[key]);
}
if ((undefined !== dataMgr.id )
&& (dataMgr.id != -1)) {
condition.push(dataMgr.primaryKey+'=?');
values.push(dataMgr.id);
}
var sql = ['UPDATE ',dbName,'.',dbTable,' SET ',fieldValues];
if (condition.length > 0) sql.push(' WHERE ',condition.join(' AND '));
//console.log(' -- sql['+sql.join('')+'] ');
//console.log(values);
//console.log(condition);
//console.log('');
myDB.query(sql.join(''), values, function( err, results, fields) {
if (err) {
console.log(sql.join(''));
}
callback( err, results );
});
}
exports.update=update;
var destroy = function(dataMgr, callback) {
var dbTable = dataMgr.dbTable;
var dbName = dataMgr.dbName || AD.Defaults.dbName;
var condition = [];
var values = [];
for (var key in dataMgr.model) {
// if (condition != '') condition += ' AND ';
condition.push( key+'=?');
values.push( dataMgr.model[key]);
}
var sql = ['DELETE FROM ',dbName,'.',dbTable];
if (condition.length > 0) sql.push(' WHERE ',condition.join(' AND '));
myDB.query(sql.join(''), values, function( err, results, fields) {
callback( err, results );
});
}
exports.destroy = destroy;
var listDatabases = function (callback) {
// generate a list of available databases
var sql = 'SHOW DATABASES';
myDB.query(sql, [], function( err, results, fields) {
callback( err, results, fields );
});
}
exports.listDatabases = listDatabases;
var listTables = function (dbName, callback) {
// generate a list of available databases
var sql = 'SHOW TABLES FROM '+dbName;
myDB.query(sql, [], function( err, results, fields) {
callback( err, results, fields );
});
}
exports.listTables = listTables;
var listFields = function (dbName, dbTable, callback) {
// generate a list of available databases
var sql = 'SHOW COLUMNS FROM '+dbName+'.'+dbTable;
myDB.query(sql, [], function( err, results, fields) {
callback( err, results, fields );
});
}
exports.listFields = listFields;