Convert values to java.time.Instant

CHANGELOG.md

@@ -1,5 +1,8 @@
 ## 0.9.2 
 
+### Improvements 
+- [jdbc-v2] `ResultSetImpl.getObject()` handles `java.time.Instant`
+
 ### Improvements 
 - [jdbc-v2] Classes `com.clickhouse.jdbc.ClientInfoProperties` and `com.clickhouse.jdbc.DriverProperties` moved to public 
 API. (https://github.com/ClickHouse/clickhouse-java/pull/2521)

jdbc-v2/src/main/java/com/clickhouse/jdbc/internal/JdbcUtils.java

@@ -20,11 +20,8 @@
 import java.sql.SQLException;
 import java.sql.SQLType;
 import java.sql.Types;
-import java.time.LocalDate;
-import java.time.LocalDateTime;
-import java.time.LocalTime;
-import java.time.OffsetDateTime;
-import java.time.ZonedDateTime;
+import java.time.*;
+import java.time.chrono.ChronoZonedDateTime;
 import java.time.temporal.TemporalAccessor;
 import java.util.ArrayList;
 import java.util.Collections;
@@ -260,6 +257,8 @@ public static Object convert(Object value, Class<?> type, ClickHouseColumn colum
                 return OffsetDateTime.from((TemporalAccessor) value);
             } else if (type == ZonedDateTime.class && value instanceof TemporalAccessor) {
                 return ZonedDateTime.from((TemporalAccessor) value);
+            } else if (type == Instant.class && value instanceof TemporalAccessor) {
+                return Instant.from((TemporalAccessor) value);
             } else if (type == Date.class && value instanceof TemporalAccessor) {
                 return Date.valueOf(LocalDate.from((TemporalAccessor) value));
             } else if (type == java.sql.Timestamp.class && value instanceof TemporalAccessor) {

jdbc-v2/src/test/java/com/clickhouse/jdbc/internal/JdbcUtilsTest.java

@@ -2,10 +2,12 @@
 
 import com.clickhouse.client.api.data_formats.internal.BinaryStreamReader;
 import com.clickhouse.data.ClickHouseColumn;
-import org.testng.annotations.Test;
+import org.testng.annotations.*;
 
 import java.math.BigDecimal;
 import java.sql.SQLException;
+import java.time.Instant;
+import java.time.ZoneId;
 import java.util.Arrays;
 import java.util.List;
 
@@ -78,4 +80,19 @@ public void testConvertToInetAddress() throws Exception {
         ClickHouseColumn column = ClickHouseColumn.of("ip", "IPv4");
         assertEquals(JdbcUtils.convert(java.net.InetAddress.getByName("192.168.0.1"), java.net.Inet6Address.class, column).toString(), "/0:0:0:0:0:ffff:c0a8:1");
     }
+
+    @DataProvider(name = "timeZones")
+    public Object[][] timeZones() {
+        return new Object[][] {
+                { ZoneId.of("UTC") },
+                { ZoneId.of("Europe/Paris") },
+        };
+    }
+
+    @Test(groups = {"unit"})
+    public void testConvertToJavaTimeInstant() throws Exception {
+        Instant timestamp = Instant.parse("2016-06-07T21:30:00Z");
+        assertEquals(JdbcUtils.convert(timestamp.atZone(ZoneId.of("UTC")), Instant.class), timestamp);
+        assertEquals(JdbcUtils.convert(timestamp.atZone(ZoneId.of("UTC+7")), Instant.class), timestamp);
+    }
 }