From bcc93dfabb50e0b5316cdcdb8801411fec966508 Mon Sep 17 00:00:00 2001
From: lukaseder <lukas.eder@gmail.com>
Date: Wed, 26 Nov 2014 17:11:55 +0100
Subject: [PATCH] [#3781] Add support for DSL.trunc(date, DatePart) for H2

---
 jOOQ/src/main/java/org/jooq/impl/DSL.java       | 12 ++++++------
 jOOQ/src/main/java/org/jooq/impl/TruncDate.java | 15 +++++++++++++++
 2 files changed, 21 insertions(+), 6 deletions(-)

diff --git a/jOOQ/src/main/java/org/jooq/impl/DSL.java b/jOOQ/src/main/java/org/jooq/impl/DSL.java
index d70ea507ac..363c5ad628 100644
--- a/jOOQ/src/main/java/org/jooq/impl/DSL.java
+++ b/jOOQ/src/main/java/org/jooq/impl/DSL.java
@@ -8009,7 +8009,7 @@ public class DSL {
     /**
      * Truncate a date to the beginning of the day.
      */
-    @Support({ CUBRID, HSQLDB, POSTGRES })
+    @Support({ CUBRID, H2, HSQLDB, POSTGRES })
     public static Field<Date> trunc(Date date) {
         return trunc(date, DatePart.DAY);
     }
@@ -8017,7 +8017,7 @@ public class DSL {
     /**
      * Truncate a date to a given datepart.
      */
-    @Support({ CUBRID, HSQLDB, POSTGRES })
+    @Support({ CUBRID, H2, HSQLDB, POSTGRES })
     public static Field<Date> trunc(Date date, DatePart part) {
         return trunc(Utils.field(date), part);
     }
@@ -8025,7 +8025,7 @@ public class DSL {
     /**
      * Truncate a timestamp to the beginning of the day.
      */
-    @Support({ CUBRID, HSQLDB, POSTGRES })
+    @Support({ CUBRID, H2, HSQLDB, POSTGRES })
     public static Field<Timestamp> trunc(Timestamp timestamp) {
         return trunc(timestamp, DatePart.DAY);
     }
@@ -8033,7 +8033,7 @@ public class DSL {
     /**
      * Truncate a timestamp to a given datepart.
      */
-    @Support({ CUBRID, HSQLDB, POSTGRES })
+    @Support({ CUBRID, H2, HSQLDB, POSTGRES })
     public static Field<Timestamp> trunc(Timestamp timestamp, DatePart part) {
         return trunc(Utils.field(timestamp), part);
     }
@@ -8041,7 +8041,7 @@ public class DSL {
     /**
      * Truncate a date or a timestamp to the beginning of the day.
      */
-    @Support({ CUBRID, HSQLDB, POSTGRES })
+    @Support({ CUBRID, H2, HSQLDB, POSTGRES })
     public static <T extends java.util.Date> Field<T> trunc(Field<T> date) {
         return trunc(date, DatePart.DAY);
     }
@@ -8049,7 +8049,7 @@ public class DSL {
     /**
      * Truncate a date or a timestamp to a given datepart.
      */
-    @Support({ CUBRID, HSQLDB, POSTGRES })
+    @Support({ CUBRID, H2, HSQLDB, POSTGRES })
     public static <T extends java.util.Date> Field<T> trunc(Field<T> date, DatePart part) {
         return new TruncDate<T>(date, part);
     }
diff --git a/jOOQ/src/main/java/org/jooq/impl/TruncDate.java b/jOOQ/src/main/java/org/jooq/impl/TruncDate.java
index bece205143..7fcc228dc7 100644
--- a/jOOQ/src/main/java/org/jooq/impl/TruncDate.java
+++ b/jOOQ/src/main/java/org/jooq/impl/TruncDate.java
@@ -73,6 +73,7 @@ class TruncDate<T extends java.util.Date> extends AbstractFunction<T> {
     @Override
     final QueryPart getFunction0(Configuration configuration) {
         String keyword = null;
+        String format = null;
 
         switch (configuration.dialect().family()) {
 
@@ -92,6 +93,20 @@ class TruncDate<T extends java.util.Date> extends AbstractFunction<T> {
                 return field("{trunc}({0}, {1})", getDataType(), date, inline(keyword));
             }
 
+            case H2: {
+                switch (part) {
+                    case YEAR:   format = "yyyy";                break;
+                    case MONTH:  format = "yyyy-MM";             break;
+                    case DAY:    format = "yyyy-MM-dd";          break;
+                    case HOUR:   format = "yyyy-MM-dd HH";       break;
+                    case MINUTE: format = "yyyy-MM-dd HH:mm";    break;
+                    case SECOND: format = "yyyy-MM-dd HH:mm:ss"; break;
+                    default: throwUnsupported();
+                }
+
+                return field("{parsedatetime}({formatdatetime}({0}, {1}), {1})", getDataType(), date, inline(format));
+            }
+
 // These don't work yet and need better integration-testing:
 // ---------------------------------------------------------
 //            case MARIADB: