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node-task/node_modules/mysql2/lib/commands/execute.js

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2014-09-24 17:56:53 -04:00
var Command = require('./command');
var Packets = require('../packets/index.js');
var util = require('util');
var compileParser = require('../compile_binary_parser');
function Execute(options, callback)
{
Command.call(this);
this.query = options.sql;
this.onResult = callback; // TODO check felixge multi-result api
this.fieldCount = 0;
this.parameterCount = 0;
this.fields = [];
this.parameterDefinitions = [];
this.resultFields = [];
this.resultFieldCount = 0;
this.insertId = 0;
this.parameters = options.values;
this.rows = [];
this.statementInfo = null;
this.options = options;
}
util.inherits(Execute, Command);
Execute.prototype.start = function(packet, connection) {
var cachedStatement = connection.statements[statementKey(this.query, this.options)];
if (!cachedStatement) { // prepare first
connection.writePacket(new Packets.PrepareStatement(this.query).toPacket(1));
} else {
this.statementInfo = cachedStatement;
return this.doExecute(connection);
}
return Execute.prototype.prepareHeader;
};
function PreparedStatementInfo(id) {
this.id = id;
this.parser = null;
}
Execute.prototype.prepareHeader = function(packet, connection) {
var header = new Packets.PreparedStatementHeader(packet);
this.fieldCount = header.fieldCount;
this.parameterCount = header.parameterCount;
this.statementInfo = new PreparedStatementInfo(header.id);
connection.statements[statementKey(this.query, this.options)] = this.statementInfo;
if (this.parameterCount > 0)
return Execute.prototype.readParameter;
else if (this.fieldCount > 0)
return Execute.prototype.readField;
else
return this.doExecute(connection);
};
Execute.prototype.readParameter = function(packet, connection) {
var def = new Packets.ColumnDefinition(packet);
this.parameterDefinitions.push(def);
if (this.parameterDefinitions.length == this.parameterCount)
return Execute.prototype.parametersEOF;
return this.readParameter;
};
function statementKey(query, options) {
return (typeof options.nestTables) +
'/' + options.nestTables + '/' + options.rowsAsHash
+ query;
}
// TODO: move to connection.js?
function getFieldsKey(fields, options) {
var res = (typeof options.nestTables) + '/' + options.nestTables + '/' + options.rowsAsHash;
for (var i=0; i < fields.length; ++i)
res += '/' + fields[i].name + ':' + fields[i].columnType + ':' + fields[i].flags;
return res;
}
Execute.prototype.readField = function(packet, connection) {
var def = new Packets.ColumnDefinition(packet);
this.fields.push(def);
var parserKey = '';
// TODO: api to allow to flag "I'm not going to change schema for this statement"
// this way we can ignore column definitions in binary response and use
// definition from prepare phase. Note that it's what happens currently
// e.i if you do execute("select * from foo") and later add/remove/rename rows to foo
// (without reconnecting) you are in trouble
if (this.fields.length == this.fieldCount) {
if (!this.statementInfo.parser) {
// compile row parser
parserKey = getFieldsKey(this.fields, this.options);
// try cached first
this.statementInfo.fields = this.fields;
this.statementInfo.parser = connection.binaryProtocolParsers[parserKey];
if (!this.statementInfo.parser) {
this.statementInfo.parser = compileParser(this.fields, this.options, connection.config);
connection.binaryProtocolParsers[parserKey] = this.statementInfo.parser;
}
}
return Execute.prototype.fieldsEOF;
}
return Execute.prototype.readField;
};
Execute.prototype.parametersEOF = function(packet, connection) {
// check EOF
if (!packet.isEOF())
throw "Expected EOF packet";
if (this.fieldCount > 0)
return Execute.prototype.readField;
else
return this.doExecute(connection);
};
Execute.prototype.fieldsEOF = function(packet, connection) {
// check EOF
if (!packet.isEOF())
throw "Expected EOF packet";
return this.doExecute(connection);
};
Execute.prototype.doExecute = function(connection)
{
connection.sequenceId = 0;
var executePacket = new Packets.Execute(this.statementInfo.id, this.parameters);
connection.writePacket(executePacket.toPacket(1));
return Execute.prototype.resultsetHeader;
};
Execute.prototype.resultsetHeader = function(packet) {
var self = this;
var header = new Packets.ResultSetHeader(packet);
this.resultFieldCount = header.fieldCount;
this.insertId = header.insertId;
if (this.resultFieldCount === 0) {
if (this.onResult)
process.nextTick(function() {
self.onResult(null, header, []);
});
return null;
}
return Execute.prototype.readResultField;
};
Execute.prototype.readResultField = function(packet) {
var def;
if (this.statementInfo.parser) // ignore result fields definition, we are reusing fields from prepare response
this.resultFields.push(null);
else {
def = new Packets.ColumnDefinition(packet);
this.resultFields.push(def);
}
if (this.resultFields.length == this.resultFieldCount) {
return Execute.prototype.resultFieldsEOF;
}
return Execute.prototype.readResultField;
};
Execute.prototype.resultFieldsEOF = function(packet) {
// check EOF
if (!packet.isEOF())
throw "Expected EOF packet";
return Execute.prototype.row;
};
Execute.prototype.row = function(packet)
{
var self = this;
// TODO: refactor to share code with Query::row
if (packet.isEOF()) {
if (this.onResult)
process.nextTick(function() {
self.onResult(null, self.rows, self.statementInfo.fields);
})
return null;
}
var r = new this.statementInfo.parser(packet);
if (this.onResult)
this.rows.push(r);
else
this.emit('result', r);
return Execute.prototype.row;
};
module.exports = Execute;