135 lines
2.8 KiB
JavaScript
135 lines
2.8 KiB
JavaScript
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/**
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* Simulates a connection to a database by making asynchronous requests to a
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* remote REST service that returns the results in JSON format.
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* Using this class can perform any operation that can be done with a database,
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* like open/close a connection or selecion/updating queries.
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*
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* Warning! You should set a well defined dababase level privileges to use this
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* class or you could have a serious security hole in you application becasuse
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* the user can send any statement to the server. For example: DROP DATABASE
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*/
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var Connection = new Class ();
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module.exports = Connection;
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var Flag =
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{
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NOT_NULL : 1
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,PRI_KEY : 2
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,AI : 512 | 2 | 1
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};
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var Type =
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{
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BOOLEAN : 1
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,INTEGER : 3
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,DOUBLE : 4
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,STRING : 5
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,DATE : 8
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,DATE_TIME : 9
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};
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Connection.extend
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({
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Flag: Flag
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,Type: Type
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});
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Connection.implement
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({
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Extends: Vn.JsonConnection
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/**
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* Runs a SQL query on the database.
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*
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* @param {String} sql The SQL statement
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* @param {Function} callback The function to call when operation is done
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*/
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,execSql: function (sql, callback)
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{
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this.send ('core/query', {'sql': sql},
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this._onExec.bind (this, callback));
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}
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/**
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* Runs a stmt on the database.
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*
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* @param {Sql.Stmt} stmt The statement
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* @param {Function} callback The function to call when operation is done
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* @param {Object} params The statement parameters
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*/
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,execStmt: function (stmt, callback, params)
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{
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this.execSql (stmt.render (params), callback);
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}
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/**
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* Runs a query on the database.
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*
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* @param {String} query The SQL statement
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* @param {Function} callback The function to call when operation is done
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* @param {Object} params The statement parameters
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*/
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,execQuery: function (query, callback, params)
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{
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this.execStmt (new Sql.String ({query: query}), callback, params);
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}
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/*
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* Parses a value to date.
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*/
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,valueToDate: function (value)
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{
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return new Date (value * 1000);
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}
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/*
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* Called when a query is executed.
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*/
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,_onExec: function (callback, json, error)
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{
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if (json)
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try {
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if (json && json instanceof Array)
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for (var i = 0; i < json.length; i++)
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if (json[i] !== true)
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{
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var data = json[i].data;
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var columns = json[i].columns;
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for (var j = 0; j < columns.length; j++)
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{
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var castFunc = null;
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switch (columns[j].type)
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{
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case Type.DATE:
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case Type.DATE_TIME:
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case Type.TIMESTAMP:
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castFunc = this.valueToDate;
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break;
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}
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if (castFunc !== null)
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{
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if (columns[j].def != null)
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columns[j].def = castFunc (columns[j].def);
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for (var k = 0; k < data.length; k++)
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if (data[k][j] != null)
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data[k][j] = castFunc (data[k][j]);
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}
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}
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}
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}
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catch (e)
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{
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error = e;
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}
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if (callback)
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callback (new Db.ResultSet (json, error));
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}
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});
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