BAEL-1348 | BatchProcessing example using jdbc (#3216)

* BAEL-EVAL | Adding an example to demo Bean Injection

### Changes done
A Spring boot app to demo bean injection

* Adding @Autowired for Constructor Injection

* BAEL-EVAL | Correcting the method name

* BAEL-EVAL

* BAEL-1348 | Adding example of Batch Processing in JDBC

### Changes done
- Added one example using statement
- Added one example using preparedstatement

* Removing evaluation article

* BAEL-1348 | Adding example of Batch Processing in JDBC

### Changes done
- Added an example using statement
- Added an example using preparedstatement

* BAEL-1348 | BatchProcessing example using jdbc

### Changes done
- Add example using statement
- Add example using PreparedStatement
- Add Unit Tests

* BAEL-1348 | Changes to pom.xml and refactoring UnitTest

* BAEL-1348 | Removing the example using spring-boot

core-java/src/test/java/com/baeldung/jdbc/BatchProcessingTest.java

@@ -0,0 +1,71 @@
+package com.baeldung.jdbc;
+
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.Mockito;
+import org.mockito.MockitoAnnotations;
+import org.mockito.junit.MockitoJUnitRunner;
+
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.Statement;
+
+@RunWith(MockitoJUnitRunner.class)
+public class BatchProcessingTest {
+
+
+    @InjectMocks
+    private BatchProcessing target = new BatchProcessing();
+
+    @Mock
+    private Connection connection;
+
+    @Mock
+    private Statement statement;
+
+    @Mock
+    private PreparedStatement employeeStatement;
+
+    @Mock
+    private PreparedStatement employeeAddressStatement;
+
+    @Before
+    public void before(){
+        MockitoAnnotations.initMocks(this);
+    }
+
+
+    @Test
+    public void when_useStatement_thenInsertData_success() throws Exception {
+        Mockito.when(connection.createStatement()).thenReturn(statement);
+        target.useStatement();
+    }
+
+    @Test
+    public void when_useStatement_ifThrowException_thenCatchException() throws Exception {
+        Mockito.when(connection.createStatement()).thenThrow(new RuntimeException());
+        target.useStatement();
+    }
+
+    @Test
+    public void when_usePreparedStatement_thenInsertData_success() throws Exception {
+        String insertEmployeeSQL = "INSERT INTO EMPLOYEE(ID, NAME, DESIGNATION) VALUES (?,?,?);";
+        String insertEmployeeAddrSQL = "INSERT INTO EMP_ADDRESS(ID, EMP_ID, ADDRESS) VALUES (?,?,?);";
+        Mockito.when(connection.prepareStatement(insertEmployeeSQL)).thenReturn(employeeStatement);
+        Mockito.when(connection.prepareStatement(insertEmployeeAddrSQL)).thenReturn(employeeAddressStatement);
+        target.usePreparedStatement();
+    }
+
+    @Test
+    public void when_usePreparedStatement_ifThrowException_thenCatchException() throws Exception {
+        String insertEmployeeSQL = "INSERT INTO EMPLOYEE(ID, NAME, DESIGNATION) VALUES (?,?,?);";
+        String insertEmployeeAddrSQL = "INSERT INTO EMP_ADDRESS(ID, EMP_ID, ADDRESS) VALUES (?,?,?);";
+        Mockito.when(connection.prepareStatement(insertEmployeeSQL)).thenReturn(employeeStatement);
+        Mockito.when(connection.prepareStatement(insertEmployeeAddrSQL)).thenThrow(new RuntimeException());
+        target.usePreparedStatement();
+    }
+}