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Compile · AlaSQL/alasql Wiki · GitHub
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Compile
Mathias Rangel Wulff edited this page Nov 24, 2015
·
6 revisions
alasql.compile()
lets you precompile statements. It is a kind a "prepare" in other SQL databases.
To compile statement use:
var stmt = alasql.compile(sql [, dbName])
Then run the statement:
stmt([parameters array] [, callback])
Compiled statement examples:
var bigSum = alasql.compile('SELECT SUM(a) FROM one WHERE a>?', 'myDBname'); // no DBname needed
var foo = bigSum([10]) ;
var ins = alasql.compile('INSERT INTO one VALUES (?,?)'); // no DBname needed
ins(1,10);
ins(2,20);
Here is the example how to calculate sum of numbers > 2 from [1,2,3,4,5]:
var data = [{a:1},{a:2},{a:3},{a:4},{a:5}];
// Compile
var mysum = alasql.compile("SELECT VALUE SUM(a) FROM ? WHERE a > 2");
// Run
var res = mysum([data])
How to deal with parameters:
var insert1 = db.compile('INSERT INTO one (?,?)');
var insert2 = db.compile('INSERT INTO one ($a,$b)');
var insert3 = db.compile('INSERT INTO one (:a,:b)');
insert1([1,2]);
insert2({a:1,b:2});
insert3({a:3,b:4});
Try this example in jsFiddle
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