insert null into Integer column using JDBC

2021-05-26 00:14:14 +02:00
parent c24379b927
commit 239da42aab
3 changed files with 130 additions and 0 deletions
@@ -0,0 +1,52 @@
+package com.baeldung.insertnull;
+
+import org.hamcrest.CoreMatchers;
+import org.hamcrest.MatcherAssert;
+import org.junit.jupiter.api.Test;
+
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.Types;
+
+import static org.hamcrest.CoreMatchers.equalTo;
+import static org.hamcrest.MatcherAssert.assertThat;
+
+public class InsertNullUnitTest {
+
+    private final String SQL = "INSERT INTO Person VALUES(?,?,?,?)";
+
+    @Test
+    public void givenNewPerson_whenSetNullIsUsed_thenNewRecordIsCreated() throws Exception {
+        Person person = new Person(1, "John", "Doe", null);
+
+        try (PreparedStatement preparedStatement = DBConfig.getConnection().prepareStatement(SQL)) {
+            preparedStatement.setInt(1, person.getId());
+            preparedStatement.setString(2, person.getName());
+            preparedStatement.setString(3, person.getLastName());
+            if (person.getAge() == null)
+                preparedStatement.setNull(4, Types.INTEGER);
+            else
+                preparedStatement.setInt(4, person.getAge());
+            int noOfRows = preparedStatement.executeUpdate();
+
+            assertThat(noOfRows, equalTo(1));
+        } catch (Exception ignored) {
+        }
+    }
+
+    @Test
+    public void givenNewPerson_whenSetObjectIsUsed_thenNewRecordIsCreated() throws Exception {
+        Person person = new Person(2, "John", "Doe", null);
+
+        try (PreparedStatement preparedStatement = DBConfig.getConnection().prepareStatement(SQL)) {
+            preparedStatement.setInt(1, person.getId());
+            preparedStatement.setString(2, person.getName());
+            preparedStatement.setString(3, person.getLastName());
+            preparedStatement.setObject(4, person.getAge(), Types.INTEGER);
+            int noOfRows = preparedStatement.executeUpdate();
+
+            assertThat(noOfRows, equalTo(1));
+        } catch (Exception ignored) {
+        }
+    }
+}