diff --git a/README.md b/README.md
index 8073f53..d41ffb5 100644
--- a/README.md
+++ b/README.md
@@ -66,7 +66,8 @@ Different value types are escaped differently, here is how:
the object. If the property's value is a function, it is skipped; if the
property's value is an object, toString() is called on it and the returned
value is used.
-* `undefined` / `null` are converted to `NULL`
+* JavaScript `null` is converted to MySQL `NULL`
+* JavaScript `undefined` is converted to MySQL `DEFAULT`
* `NaN` / `Infinity` are left as-is. MySQL does not support these, and trying
to insert them as values will trigger MySQL errors until they implement
support.
diff --git a/lib/SqlString.js b/lib/SqlString.js
index 4dbf8fc..666450c 100644
--- a/lib/SqlString.js
+++ b/lib/SqlString.js
@@ -31,10 +31,14 @@ SqlString.escapeId = function escapeId(val, forbidQualified) {
};
SqlString.escape = function escape(val, stringifyObjects, timeZone) {
- if (val === undefined || val === null) {
+ if (val === null) {
return 'NULL';
}
+ if (val === undefined) {
+ return 'DEFAULT';
+ }
+
switch (typeof val) {
case 'boolean': return (val) ? 'true' : 'false';
case 'number': return val+'';
diff --git a/test/unit/test-SqlString.js b/test/unit/test-SqlString.js
index 7ac6358..c3102de 100644
--- a/test/unit/test-SqlString.js
+++ b/test/unit/test-SqlString.js
@@ -35,8 +35,8 @@ test('SqlString.escapeId', {
});
test('SqlString.escape', {
- 'undefined -> NULL': function() {
- assert.equal(SqlString.escape(undefined), 'NULL');
+ 'undefined -> DEFAULT': function() {
+ assert.equal(SqlString.escape(undefined), 'DEFAULT');
},
'null -> NULL': function() {
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