cql-tx/cassandra-dml-handler.js at master · rernas35/cql-tx · GitHub

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/**
 * New node file
 */


var cassandra = require('cassandra-driver');
var async = require('async');
var sqlStrUtility = require('./sql-str-utility');
var cassandraDDLHandler= require('./cassandra-ddl-handler');
var cassandraBase = require('./cassandra-base');
var logger = require("./logger");


function CassandraDMLHandler(){


	this.deleteTransactional=function(cql,txObject){
		var deleteStatement = sqlStrUtility.SqlStrUtility().getDeleteStatement(cql);
		deleteStatement.txObject=txObject;
		this.deleteTxRecord(deleteStatement,txObject);
	}

	this.updateTransactional=function(cql,txObject){
		var updateStatement = sqlStrUtility.SqlStrUtility().getUpdateStatement(cql);
		updateStatement.txObject=txObject;
		this.updateTxRecord(updateStatement,txObject);
	}

	this.deleteTxRecord=function(statement,txObject){
		logger.debug(txObject,'inserting tx record on table ' + statement.table);
		var columnClause = '';
		var valueClause = '';
		for (var i=0; i<statement.columns.length;i++){
			var c = statement.columns[i];
			if (columnClause != '')
				columnClause += ',';
			columnClause += c.column;
			if (valueClause != '')
				valueClause += ',';
			valueClause += c.value;
		}

		this.execute('insert into tx_' + statement.table + '(' + columnClause + ',' +  cassandraDDLHandler.getInstance().transactionColumns.getColumnString() +
				') values(' + valueClause + ','  + cassandraDDLHandler.getInstance().transactionColumns.deleteValues + ",''," + statement.txObject.getTransactionId() +')',
				[],
				statement,
				this.dummyCallback,
				this,
				txObject);
		logger.debug(txObject,'inserted tx record on table ' + statement.table);
	}

	this.updateTxRecord=function(statement,txObject){
		logger.debug(txObject,'inserting tx record on table ' + statement.table);
		var columnClause = '';
		var valueClause = '';
		for (var i=0; i<statement.columns.length;i++){
			var c = statement.columns[i];
			if (columnClause != '')
				columnClause += ',';
			columnClause += c.column;
			if (valueClause != '')
				valueClause += ',';
			valueClause += c.value;
		}
		var changesClause = '';
		for (var i=0; i<statement.changes.length;i++){
			var c = statement.changes[i];
			if (changesClause != '')
				changesClause += ',';
			changesClause += c.column;
		}

		this.execute('insert into tx_' + statement.table + '(' + columnClause + ',' + cassandraDDLHandler.getInstance().transactionColumns.getColumnString() +
				') values(' + valueClause + ',' + cassandraDDLHandler.getInstance().transactionColumns.updateValues + ",'" + changesClause +  "'," + statement.txObject.getTransactionId() +')',
				[],
				statement,
				this.dummyCallback,
				this,
				txObject);
		logger.debug(txObject,'inserted tx record on table ' + statement.table);
	}

	this.insertTransactional=function(cql,txObject){
		var insertStatement = sqlStrUtility.SqlStrUtility().getInsertStatement(cql);
		insertStatement.txObject=txObject;
		this.insertTxRecord(insertStatement,txObject);
	}

	this.insertTxRecord=function(statement,txObject){
		logger.debug(txObject,'inserting tx record on table ' + statement.table);
		var columnClause = '';
		var valueClause = '';
		for (var i=0; i<statement.columns.length;i++){
			var c = statement.columns[i];
			if (columnClause != '')
				columnClause += ',';
			columnClause += c.column;
			if (valueClause != '')
				valueClause += ',';
			valueClause += c.value;
		}
		this.execute('insert into tx_' + statement.table + '(' + columnClause + ',' + cassandraDDLHandler.getInstance().transactionColumns.getColumnString() +
				') values(' + valueClause + ',' + cassandraDDLHandler.getInstance().transactionColumns.insertValues + ',' + statement.txObject.getTransactionId() +')',
				[],
				statement,
				this.dummyCallback,
				this,
				txObject);
		logger.debug(txObject,'inserted tx record on table ' + statement.table);
	}

	this.dummyCallback=function(rows,statement,thus,txObject){
		logger.debug(txObject,"Dummy return from Cassandra DML");
		txObject.txCallback(rows, statement);
	};


}


module.exports = {
		getInstance : function(){
			CassandraDMLHandler.prototype = cassandraBase.getInstance();
			var handler = new CassandraDMLHandler();
			return {
				executeTransactional : function(cql,txObject){
					if (sqlStrUtility.SqlStrUtility().isUpdate(cql)){
						handler.updateTransactional(cql,txObject);
					}else if (sqlStrUtility.SqlStrUtility().isInsert(cql)){
						handler.insertTransactional(cql,txObject);
					}else if (sqlStrUtility.SqlStrUtility().isDelete(cql)){
						handler.deleteTransactional(cql,txObject);
					}

				}
			}
		}

}