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insert null into Integer column using JDBC - code improvements

This commit is contained in:
Mladen Savic 2021-06-03 12:26:02 +02:00
parent 239da42aab
commit 07af5a2687
2 changed files with 6 additions and 14 deletions
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10
persistence-modules/core-java-persistence-2/src/main/java/com/baeldung/insertnull/DBConfig.java
View File

@ -9,22 +9,18 @@ public class DBConfig {
private static Connection INSTANCE;
public static Connection getConnection() throws Exception {
public static Connection getConnection() throws SQLException {
if (INSTANCE == null) {
Class.forName("org.h2.Driver");
INSTANCE = DriverManager.getConnection("jdbc:h2:mem:insertnull", "user", "password");
createPersonTable();
}
return INSTANCE;
}
private static void createPersonTable() {
try {
Statement statement = INSTANCE.createStatement();
private static void createPersonTable() throws SQLException {
try(Statement statement = INSTANCE.createStatement()) {
String sql = "CREATE TABLE Person (id INTEGER not null, name VARCHAR(50), lastName VARCHAR(50), age INTEGER, PRIMARY KEY (id))";
statement.executeUpdate(sql);
} catch (SQLException e) {
e.printStackTrace();
}
}
}

10
persistence-modules/core-java-persistence-2/src/test/java/com/baeldung/insertnull/InsertNullUnitTest.java
View File

@ -1,11 +1,9 @@
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.SQLException;
import java.sql.Types;
import static org.hamcrest.CoreMatchers.equalTo;
@ -16,7 +14,7 @@ public class InsertNullUnitTest {
private final String SQL = "INSERT INTO Person VALUES(?,?,?,?)";
@Test
public void givenNewPerson_whenSetNullIsUsed_thenNewRecordIsCreated() throws Exception {
public void givenNewPerson_whenSetNullIsUsed_thenNewRecordIsCreated() throws SQLException {
Person person = new Person(1, "John", "Doe", null);
try (PreparedStatement preparedStatement = DBConfig.getConnection().prepareStatement(SQL)) {
@ -30,12 +28,11 @@ public class InsertNullUnitTest {
int noOfRows = preparedStatement.executeUpdate();
assertThat(noOfRows, equalTo(1));
} catch (Exception ignored) {
}
}
@Test
public void givenNewPerson_whenSetObjectIsUsed_thenNewRecordIsCreated() throws Exception {
public void givenNewPerson_whenSetObjectIsUsed_thenNewRecordIsCreated() throws SQLException {
Person person = new Person(2, "John", "Doe", null);
try (PreparedStatement preparedStatement = DBConfig.getConnection().prepareStatement(SQL)) {
@ -46,7 +43,6 @@ public class InsertNullUnitTest {
int noOfRows = preparedStatement.executeUpdate();
assertThat(noOfRows, equalTo(1));
} catch (Exception ignored) {
}
}
}