Add Function "LEN" #1196

h2/src/docsrc/html/changelog.html

@@ -21,6 +21,8 @@ Change Log
 
 <h2>Next Version (unreleased)</h2>
 <ul>
+<li>Issue #1196: Feature request for MS SQL Server Compatibility Mode
+</li>
 <li>Issue #1177: Resource leak in Recover tool
 </li>
 <li>PR #1183: Improve concurrency of connection pool with wait-free implement

h2/src/main/org/h2/expression/Function.java

@@ -239,6 +239,8 @@ public class Function extends Expression implements FunctionCall {
         addFunction("LCASE", LCASE, 1, Value.STRING);
         addFunction("LEFT", LEFT, 2, Value.STRING);
         addFunction("LENGTH", LENGTH, 1, Value.LONG);
+        // alias for MSSQLServer
+        addFunction("LEN", LENGTH, 1, Value.LONG);
         // 2 or 3 arguments
         addFunction("LOCATE", LOCATE, VAR_ARGS, Value.INT);
         // alias for MSSQLServer

h2/src/test/org/h2/test/db/TestFunctions.java

@@ -127,6 +127,7 @@ public class TestFunctions extends TestDb implements AggregateFunction {
         testAnnotationProcessorsOutput();
         testRound();
         testSignal();
+        testLength();
 
         deleteDb("functions");
     }
@@ -2080,6 +2081,24 @@ public class TestFunctions extends TestDb implements AggregateFunction {
         conn.close();
     }
 
+    private void testLength() throws SQLException {
+        deleteDb("functions");
+
+        Connection conn = getConnection("functions");
+        Statement stat = conn.createStatement();
+
+        final ResultSet rs = stat.executeQuery(
+                "select LENGTH('This has 17 chars'), LEN('MSSQLServer uses the len keyword') from dual");
+
+        rs.next();
+        assertEquals(17, rs.getInt(1));
+        assertEquals(32, rs.getInt(2));
+
+
+        rs.close();
+        conn.close();
+    }
+
     private void testThatCurrentTimestampIsSane() throws SQLException,
             ParseException {
         deleteDb("functions");