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BAEL-3961 Using a list of values in a JDBCTemplate IN clause

This commit is contained in:
Gang Wu 2020-04-14 00:43:27 -06:00
parent a057b3af44
commit 63027fd269
3 changed files with 106 additions and 7 deletions
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7
persistence-modules/spring-persistence-simple-2/src/main/java/com/baeldung/jdbc/Employee.java
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@ -9,6 +9,13 @@ public class Employee {
private String address;
public Employee(int id, String firstName, String lastName, String address) {
setId(id);
setFirstName(firstName);
setLastName(lastName);
setAddress(address);
}
public int getId() {
return id;
}

41
persistence-modules/spring-persistence-simple-2/src/main/java/com/baeldung/jdbc/EmployeeDAO.java
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@ -1,21 +1,62 @@
package com.baeldung.jdbc;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import javax.sql.DataSource;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.namedparam.MapSqlParameterSource;
import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;
import org.springframework.jdbc.core.namedparam.SqlParameterSource;
import org.springframework.stereotype.Repository;
@Repository
public class EmployeeDAO {
private JdbcTemplate jdbcTemplate;
private NamedParameterJdbcTemplate namedJdbcTemplate;
public void setDataSource(DataSource dataSource) {
jdbcTemplate = new JdbcTemplate(dataSource);
namedJdbcTemplate = new NamedParameterJdbcTemplate(dataSource);
}
public int getCountOfEmployees() {
return jdbcTemplate.queryForObject("SELECT COUNT(*) FROM EMPLOYEE", Integer.class);
}
public List<Employee> getEmployeesFromIdListNamed(List<Integer> ids) {
SqlParameterSource parameters = new MapSqlParameterSource("ids", ids);
List<Employee> employees = namedJdbcTemplate.query("SELECT * FROM EMPLOYEE WHERE id IN (:ids)",
parameters,
(rs, rowNum) -> new Employee(rs.getInt("id"), rs.getString("first_name"), rs.getString("last_name"), rs.getString("address")));
return employees;
}
public List<Employee> getEmployeesFromIdList(List<Integer> ids) {
String inSql = String.join(",", Collections.nCopies(ids.size(), "?"));
List<Employee> employees = jdbcTemplate.query("SELECT * FROM EMPLOYEE WHERE id IN (" + inSql +")",
ids.toArray(),
(rs, rowNum) -> new Employee(rs.getInt("id"), rs.getString("first_name"), rs.getString("last_name"), rs.getString("address")));
return employees;
}
public List<Employee> getEmployeesFromLargeIdList(List<Integer> ids) {
jdbcTemplate.execute("CREATE TEMPORARY TABLE employee_tmp (id INT NOT NULL)");
List<Object[]> employeeIds = new ArrayList<>();
for (Integer id : ids) {
employeeIds.add(new Object[] { id });
}
jdbcTemplate.batchUpdate("INSERT INTO employee_tmp VALUES(?)", employeeIds);
List<Employee> employees = jdbcTemplate.query("SELECT * FROM EMPLOYEE WHERE id IN (SELECT id FROM employee_tmp)",
(rs, rowNum) -> new Employee(rs.getInt("id"), rs.getString("first_name"), rs.getString("last_name"), rs.getString("address")));
return employees;
}
}

63
persistence-modules/spring-persistence-simple-2/src/test/java/com/baeldung/jdbc/EmployeeDAOUnitTest.java
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@ -2,8 +2,12 @@ package com.baeldung.jdbc;
import static org.junit.jupiter.api.Assertions.assertEquals;
import java.util.ArrayList;
import java.util.List;
import javax.sql.DataSource;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mock;
@ -14,13 +18,24 @@ import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseBuilder;
import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseType;
import org.springframework.test.util.ReflectionTestUtils;
@RunWith(MockitoJUnitRunner.class)
public class EmployeeDAOUnitTest {
@Mock
JdbcTemplate jdbcTemplate;
DataSource dataSource;
@Before
public void setup() {
dataSource = new EmbeddedDatabaseBuilder().setType(EmbeddedDatabaseType.H2)
.generateUniqueName(true)
.addScript("classpath:jdbc/schema.sql")
.addScript("classpath:jdbc/test-data.sql")
.build();
}
@Test
public void whenMockJdbcTemplate_thenReturnCorrectEmployeeCount() {
EmployeeDAO employeeDAO = new EmployeeDAO();
@ -38,14 +53,50 @@ public class EmployeeDAOUnitTest {
@Test
public void whenInjectInMemoryDataSource_thenReturnCorrectEmployeeCount() {
DataSource dataSource = new EmbeddedDatabaseBuilder().setType(EmbeddedDatabaseType.H2)
.addScript("classpath:jdbc/schema.sql")
.addScript("classpath:jdbc/test-data.sql")
.build();
EmployeeDAO employeeDAO = new EmployeeDAO();
employeeDAO.setDataSource(dataSource);
assertEquals(4, employeeDAO.getCountOfEmployees());
}
@Test
public void givenSmallIdList_whenGetEmployeesFromIdList_thenReturnCorrectEmployees() {
List<Integer> ids = new ArrayList<>();
ids.add(1);
ids.add(3);
ids.add(4);
EmployeeDAO employeeDAO = new EmployeeDAO();
employeeDAO.setDataSource(dataSource);
List<Employee> employees = employeeDAO.getEmployeesFromIdList(ids);
assertEquals(3, employees.size());
assertEquals(1, employees.get(0).getId());
assertEquals(3, employees.get(1).getId());
assertEquals(4, employees.get(2).getId());
employees = employeeDAO.getEmployeesFromIdListNamed(ids);
assertEquals(3, employees.size());
assertEquals(1, employees.get(0).getId());
assertEquals(3, employees.get(1).getId());
assertEquals(4, employees.get(2).getId());
}
@Test
public void givenLargeIdList_whenGetEmployeesFromIdList_thenReturnCorrectEmployees() {
List<Integer> ids = new ArrayList<>();
ids.add(1);
ids.add(3);
ids.add(4);
EmployeeDAO employeeDAO = new EmployeeDAO();
employeeDAO.setDataSource(dataSource);
List<Employee> employees = employeeDAO.getEmployeesFromLargeIdList(ids);
assertEquals(3, employees.size());
assertEquals(1, employees.get(0).getId());
assertEquals(3, employees.get(1).getId());
assertEquals(4, employees.get(2).getId());
}
}