145 lines
2.8 KiB
JavaScript
Executable File
145 lines
2.8 KiB
JavaScript
Executable File
'use strict';
|
|
|
|
var helpers = require('./helpers');
|
|
|
|
/**
|
|
* Base Database Driver
|
|
*
|
|
* @module driver
|
|
*/
|
|
var d = {
|
|
identifierChar: '"',
|
|
tablePrefix: null,
|
|
|
|
/**
|
|
* Low level function for naive quoting of strings
|
|
|
|
* @param {String} str
|
|
* @return {String}
|
|
* @private
|
|
*/
|
|
_quote: function(str) {
|
|
return (helpers.isString(str) && ! (str.startsWith(d.identifierChar) || str.endsWith(d.identifierChar)))
|
|
? d.identifierChar + str + d.identifierChar
|
|
: str;
|
|
},
|
|
|
|
/**
|
|
* Sets the table prefix on the passed string
|
|
*
|
|
* @param {String} str
|
|
* @return {String}
|
|
* @private
|
|
*/
|
|
_prefix: function(str) {
|
|
if (str.startsWith(d.prefix))
|
|
{
|
|
return str;
|
|
}
|
|
|
|
return d.prefix + str;
|
|
},
|
|
|
|
/**
|
|
* Set the limit clause
|
|
|
|
* @param {String} sql
|
|
* @param {Number} limit
|
|
* @param {Number|null} offset
|
|
* @return {String}
|
|
*/
|
|
limit: function(sql, limit, offset) {
|
|
sql += " LIMIT " + limit;
|
|
|
|
if (helpers.isNumber(offset))
|
|
{
|
|
sql += " OFFSET " + offset;
|
|
}
|
|
|
|
return sql;
|
|
},
|
|
|
|
/**
|
|
* Prefixes a table if it is not already prefixed
|
|
*
|
|
* @param {String} table
|
|
* @return {String}
|
|
*/
|
|
prefixTable: function(table) {
|
|
if (d.tablePrefix)
|
|
{
|
|
// Split identifier by period, will split into:
|
|
// database.schema.table OR
|
|
// schema.table OR
|
|
// database.table OR
|
|
// table
|
|
var idents = table.split('.', table);
|
|
var segments = idents.length;
|
|
|
|
// Add the database prefix
|
|
idents[segments - 1] = d._prefix(idents[segments - 1]);
|
|
|
|
table = idents.join('.');
|
|
}
|
|
|
|
return table;
|
|
},
|
|
|
|
/**
|
|
* Quote database table name, and set prefix
|
|
*
|
|
* @param {String} table
|
|
* @return {String}
|
|
*/
|
|
quoteTable: function(table) {
|
|
table = d.prefixTable(table);
|
|
|
|
// Quote after prefix
|
|
return d.quoteIdentifiers(table);
|
|
},
|
|
|
|
/**
|
|
* Use the driver's escape character to quote identifiers
|
|
*
|
|
* @param {String|Array}
|
|
* @return {String|Array}
|
|
*/
|
|
quoteIdentifiers: function(str) {
|
|
var hiers, raw;
|
|
var pattern = new RegExp(d.identifierChar + '(' + '([a-zA-Z0-9_]+)' + '(\((.*?)\))' + ')' + d.identifierChar, 'ig');
|
|
|
|
// Recurse for arrays of identifiiers
|
|
if (Array.isArray(str))
|
|
{
|
|
return str.map(d.quoteIdentifiers);
|
|
}
|
|
|
|
// Handle commas
|
|
if (str.contains(','))
|
|
{
|
|
var parts = str.split(',').map(helpers.stringTrim);
|
|
str = parts.map(d.quoteIdentifiers).join(',');
|
|
}
|
|
|
|
// Split identifiers by period
|
|
hiers = str.split('.').map(d._quote);
|
|
raw = hiers.join('.');
|
|
|
|
// Fix functions
|
|
if (raw.contains('(') && raw.contains(')'))
|
|
{
|
|
var funcs = pattern.exec(raw);
|
|
|
|
// Unquote the function
|
|
raw = raw.replace(funcs[0], funcs[1]);
|
|
|
|
// Quote the identifiers inside of the parens
|
|
var inParens = funcs[3].substring(1, funcs[3].length -1);
|
|
raw = raw.replace(inParens, d.quoteIdentifiers(inParens));
|
|
}
|
|
|
|
return raw;
|
|
}
|
|
};
|
|
|
|
module.exports = d; |