Add DB2 timestamp format compatibility

Using a dash to separate date and time

h2/src/docsrc/html/changelog.html

@@ -23,6 +23,8 @@ Change Log
 <ul>
 <li>Add padding for CHAR(N) values in PostgreSQL mode
 </li>
+<li>Issue #89: Add DB2 timestamp format compatibility
+</li>
 <li>
 </li>
 </ul>

h2/src/main/org/h2/command/Parser.java

@@ -2907,7 +2907,7 @@ public class Parser {
                         String timestamp = currentValue.getString();
                         read();
                         r = ValueExpression
-                                .get(ValueTimestamp.parse(timestamp));
+                                .get(ValueTimestamp.parse(timestamp, session.getDatabase().getMode()));
                     } else if (equalsToken("X", name)) {
                         read();
                         byte[] buffer = StringUtils

h2/src/main/org/h2/engine/FunctionAlias.java

@@ -439,7 +439,7 @@ public class FunctionAlias extends SchemaObjectBase {
                     }
                     o = objArray;
                 } else {
-                    v = v.convertTo(type);
+                    v = v.convertTo(type, -1, session.getDatabase().getMode());
                     o = v.getObject();
                 }
                 if (o == null) {

h2/src/main/org/h2/engine/Mode.java

@@ -165,6 +165,11 @@ public class Mode {
      */
     public boolean padFixedLengthStrings;
 
+    /**
+     * Whether DB2 TIMESTAMP formats are allowed.
+     */
+    public boolean allowDB2TimestampFormat;
+
     private final String name;
 
     static {
@@ -184,6 +189,7 @@ public class Mode {
                 Pattern.compile("ApplicationName|ClientAccountingInformation|" +
                         "ClientUser|ClientCorrelationToken");
         mode.prohibitEmptyInPredicate = true;
+        mode.allowDB2TimestampFormat = true;
         add(mode);
 
         mode = new Mode("Derby");

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

@@ -1263,7 +1263,7 @@ public class Function extends Expression implements FunctionCall {
             } else if (v0.getType() == Value.STRING) {
                 ValueString vd = (ValueString) v0;
                 Calendar c = Calendar.getInstance();
-                c.setTime(ValueTimestamp.parse(vd.getString()).getDate());
+                c.setTime(ValueTimestamp.parse(vd.getString(), session.getDatabase().getMode()).getDate());
                 c.set(Calendar.HOUR_OF_DAY, 0);
                 c.set(Calendar.MINUTE, 0);
                 c.set(Calendar.SECOND, 0);

h2/src/main/org/h2/value/Value.java

@@ -963,7 +963,7 @@ public abstract class Value {
             case DATE:
                 return ValueDate.parse(s.trim());
             case TIMESTAMP:
-                return ValueTimestamp.parse(s.trim());
+                return ValueTimestamp.parse(s.trim(), mode);
             case TIMESTAMP_TZ:
                 return ValueTimestampTimeZone.parse(s.trim());
             case BYTES:

h2/src/main/org/h2/value/ValueTimestamp.java

@@ -13,6 +13,7 @@ import java.sql.Timestamp;
 import java.util.Calendar;
 import java.util.TimeZone;
 import org.h2.api.ErrorCode;
+import org.h2.engine.Mode;
 import org.h2.message.DbException;
 import org.h2.util.DateTimeUtils;
 import org.h2.util.MathUtils;
@@ -109,26 +110,53 @@ public class ValueTimestamp extends Value {
 
     /**
      * Parse a string to a ValueTimestamp. This method supports the format
-     * +/-year-month-day hour:minute:seconds.fractional and an optional timezone
+     * +/-year-month-day hour[:.]minute[:.]seconds.fractional and an optional timezone
      * part.
      *
      * @param s the string to parse
      * @return the date
      */
     public static ValueTimestamp parse(String s) {
+        return parse(s, null);
+    }
+
+    /**
+     * Parse a string to a ValueTimestamp, using the given {@link Mode}.
+     * This method supports the format +/-year-month-day[ -]hour[:.]minute[:.]seconds.fractional
+     * and an optional timezone part.
+     *
+     * @param s the string to parse
+     * @param mode the database {@link Mode}
+     * @return the date
+     */
+    public static ValueTimestamp parse(String s, Mode mode) {
         try {
-            return parseTry(s);
+            return parseTry(s, mode);
         } catch (Exception e) {
             throw DbException.get(ErrorCode.INVALID_DATETIME_CONSTANT_2,
                     e, "TIMESTAMP", s);
         }
     }
 
-    private static ValueTimestamp parseTry(String s) {
+    /**
+     * See: https://stackoverflow.com/questions/3976616/how-to-find-nth-occurrence-of-character-in-a-string#answer-3976656
+     */
+    private static int findNthIndexOf(String str, char chr, int n) {
+        int pos = str.indexOf(chr);
+        while (--n > 0 && pos != -1)
+            pos = str.indexOf(chr, pos + 1);
+        return pos;
+    }
+
+    private static ValueTimestamp parseTry(String s, Mode mode) {
         int dateEnd = s.indexOf(' ');
         if (dateEnd < 0) {
             // ISO 8601 compatibility
             dateEnd = s.indexOf('T');
+            if (dateEnd < 0 && mode != null && mode.allowDB2TimestampFormat) {
+                // DB2 also allows dash between date and time
+                dateEnd = findNthIndexOf(s, '-', 3);
+            }
         }
         int timeStart;
         if (dateEnd < 0) {
@@ -148,9 +176,9 @@ public class ValueTimestamp extends Value {
                 tz = TimeZone.getTimeZone("UTC");
                 timeEnd--;
             } else {
-                int timeZoneStart = s.indexOf('+', dateEnd);
+                int timeZoneStart = s.indexOf('+', dateEnd + 1);
                 if (timeZoneStart < 0) {
-                    timeZoneStart = s.indexOf('-', dateEnd);
+                    timeZoneStart = s.indexOf('-', dateEnd + 1);
                 }
                 if (timeZoneStart >= 0) {
                     String tzName = "GMT" + s.substring(timeZoneStart);

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

@@ -497,6 +497,14 @@ public class TestCompatibility extends TestBase {
                 "fetch next 2 rows only with rs use and keep update locks");
         res = stat.executeQuery("select * from test order by id " +
                 "fetch next 2 rows only with rr use and keep exclusive locks");
+
+        // Test DB2 TIMESTAMP format with dash separating date and time
+        stat.execute("drop table test if exists");
+        stat.execute("create table test(date TIMESTAMP)");
+        stat.executeUpdate("insert into test (date) values ('2014-04-05-09.48.28.020005')");
+        assertResult("2014-04-05 09:48:28.020005", stat, "select date from test"); // <- result is always H2 format timestamp!
+        assertResult("2014-04-05 09:48:28.020005", stat, "select date from test where date = '2014-04-05-09.48.28.020005'");
+        assertResult("2014-04-05 09:48:28.020005", stat, "select date from test where date = '2014-04-05 09:48:28.020005'");
     }
 
     private void testDerby() throws SQLException {