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pg.js
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pg.js
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'use strict';
var Driver = require('../driver');
var Connection = require('../connection');
var pg = require('pg');
var util = require('util');
var PostgreSqlConnection = Connection.extend({
init: function (driver, client, createdConnection) {
this._super(driver);
this.client = client;
this.createdConnection = createdConnection;
},
close: function () {
if (this.createdConnection) {
this.client.end();
}
},
beginTransaction: function (callback) {
this.runSql("BEGIN", callback);
},
commitTransaction: function (callback) {
this.runSql("COMMIT", callback);
},
rollbackTransaction: function (callback) {
this.runSql("ROLLBACK", callback);
},
updateLastId: function (results) {
//console.log(results);
if (results && results.command === 'INSERT' && results.rows && results.rows.length === 1) {
var key;
for (key in results.rows[0]) {
results.lastId = results.rows[0][key];
if (results.lastId) {
break;
}
}
}
},
runSql2: function (sql, callback) {
//console.log(sql);
var self = this;
this.client.query(sql, function (err, results) {
if (err) { callback(err); return; }
self.updateLastId(results);
if (results.command === 'SELECT') {
results = results.rows;
}
callback(null, results);
});
},
runSql3: function (sql, values, callback) {
//console.log(sql);
var self = this;
this.client.query(sql, values, function (err, results) {
if (err) { callback(err); return; }
self.updateLastId(results);
if (results.command === 'SELECT') {
results = results.rows;
}
callback(null, results);
});
},
runSqlAll: function (sql, params, callback) {
this.runSql(sql, params, callback);
},
runSqlEach: function (sql, params, callback, doneCallback) {
// todo: check with the pg project to see if there is a way to do "each" as opposed to getting all the results back
this.runSql(sql, params, function (err, rows) {
if (err) { callback(err); return; }
var i;
for (i = 0; i < rows.length; i++) {
callback(null, rows[i]);
}
doneCallback();
});
}
});
var PostgreSqlDriver = Driver.extend({
init: function () {
this._super();
},
connect: function (opts, callback) {
var self = this;
var conn;
if (opts.db) {
conn = new PostgreSqlConnection(self, opts.db, false);
callback(null, conn);
} else {
var client = new pg.Client(opts.connectionString || opts);
client.connect(function (err) {
if (err) { callback(err); return; }
conn = new PostgreSqlConnection(self, client, true);
callback(null, conn);
});
}
},
getValuesSubstitutionString: function (index) {
return '$' + index;
},
getInsertSql: function (obj) {
var columnNamesSql = [];
var valuesSql = [];
var values = [];
var valueSubstitutionIndex = 1;
var autoIncrementColumnName;
var columnKey;
for (columnKey in obj._getModel().columns) {
var column = obj._getModel().columns[columnKey];
columnNamesSql.push(column.dbColumnName);
if (column.primaryKey && column.autoIncrement) {
autoIncrementColumnName = column.dbColumnName;
valuesSql.push('DEFAULT');
} else {
valuesSql.push(this.getValuesSubstitutionString(valueSubstitutionIndex++));
values.push(obj[columnKey]);
}
}
var returningSql = '';
if (autoIncrementColumnName) {
returningSql = 'RETURNING ' + autoIncrementColumnName;
}
var sql = util.format('INSERT INTO %s (%s) VALUES (%s) %s;', obj._getModel().tableName, columnNamesSql.join(','), valuesSql.join(','), returningSql);
var result = { sql: sql, values: values };
//console.log(result);
return result;
}
});
module.exports = PostgreSqlDriver;