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JDBCDataRepositoryImpl.java
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JDBCDataRepositoryImpl.java
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package com.clevergang.dbtests.repository.impl.jdbctemplate;
import com.clevergang.dbtests.repository.api.DataRepository;
import com.clevergang.dbtests.repository.api.data.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.jdbc.core.namedparam.MapSqlParameterSource;
import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;
import org.springframework.jdbc.core.simple.SimpleJdbcInsert;
import org.springframework.stereotype.Repository;
import java.math.BigDecimal;
import java.util.List;
import java.util.stream.Collectors;
/**
* Spring JDBCTemplate implementation of the DataRepository
*
* @author Bretislav Wajtr
*/
@Repository
public class JDBCDataRepositoryImpl implements DataRepository {
private static final Logger logger = LoggerFactory.getLogger(JDBCDataRepositoryImpl.class);
private final NamedParameterJdbcTemplate jdbcTemplate;
// NOTE: I would recommend to handle creation and caching of SimpleJdbcInsert instances like depicted here, for two reasons:
// 1. In order to SimpleJdbcInsert to be effective, it cannot be created for each call - remember that during first use of
// SimpleJdbcInsert, metadata for the table are fetched from database and this costs some time. So best way how to use SimpleJdbcInsert
// is to reuse single instance.
// 2. I wouldn't put instances of SimpleJdbcInsert to some external cache, but, like here, tie the instance of SimpleJdbcInsert with DAO bean.
// That way it's ensured, that when the DAO bean is recreated so are be recreated all SimpleJdbcInsert instances the DAO bean depends on...
private final SimpleJdbcInsert insertIntoProject;
@SuppressWarnings("SpringJavaAutowiringInspection")
@Autowired
public JDBCDataRepositoryImpl(NamedParameterJdbcTemplate jdbcTemplate) {
this.jdbcTemplate = jdbcTemplate;
this.insertIntoProject = new SimpleJdbcInsert((JdbcTemplate) jdbcTemplate.getJdbcOperations())
.withTableName("project")
.usingGeneratedKeyColumns("pid");
}
@Override
public Company findCompany(Integer pid) {
logger.info("Finding Company by ID using JDBCTemplate");
String query = "SELECT pid, address, name " +
"FROM company " +
"WHERE pid = :pid";
MapSqlParameterSource params = new MapSqlParameterSource()
.addValue("pid", pid);
/*
* Note that you can use BeanPropertyRowMapper instead (see findDepartment())
*/
RowMapper<Company> mapper = (rs, rowNum) -> {
Company row = new Company();
row.setPid(rs.getInt("pid"));
row.setAddress(rs.getString("address"));
row.setName(rs.getString("name"));
return row;
};
Company company = jdbcTemplate.queryForObject(query, params, mapper);
logger.info("Found company: " + company);
return company;
}
@Override
public Company findCompanyUsingSimpleStaticStatement(Integer pid) {
String query;
query = "SELECT pid, address, name " +
"FROM company " +
"WHERE pid = " + pid;
RowMapper<Company> mapper = (rs, rowNum) -> {
Company row = new Company();
row.setPid(rs.getInt("pid"));
row.setAddress(rs.getString("address"));
row.setName(rs.getString("name"));
return row;
};
// In Spring's JDBCTemplate it's pretty easy to execute the query using static Statement (not the PreparedStatement):
// In this DAO we autowired NamedParameterJdbcTemplate, which does not allow static statements, but this class
// is just a wrapper around original JdbcTemplate which allows static statements -> so we used getJdbcOperations()
// to get such original object and then just used one of it's methods which internally calls the static
// statement (see javadoc for each JdbcOperations#query*() method)
Company company = jdbcTemplate.getJdbcOperations().queryForObject(query, mapper);
logger.info("Found company: " + company);
return company;
}
@Override
public void removeProject(Integer pid) {
MapSqlParameterSource params = new MapSqlParameterSource();
params.addValue("pid", pid);
int update = jdbcTemplate.update("DELETE FROM project where pid = :pid", params);
assert update == 1;
}
@Override
public Department findDepartment(Integer pid) {
String query = "SELECT pid, company_pid, name" +
" FROM department " +
" WHERE pid = :pid";
MapSqlParameterSource params = new MapSqlParameterSource()
.addValue("pid", pid);
// using BeanPropertyRowMapper is easier, but with much worse performance than custom RowMapper
return jdbcTemplate.queryForObject(query, params, BeanPropertyRowMapper.newInstance(Department.class));
}
@Override
public List<Employee> employeesWithSalaryGreaterThan(Integer minSalary) {
logger.info("Looking for employeesWithSalaryGreaterThan using JDBCTemplate");
String query = "SELECT * " +
" FROM employee" +
" WHERE salary > :salary";
MapSqlParameterSource params = new MapSqlParameterSource()
.addValue("salary", minSalary);
// using BeanPropertyRowMapper is easier, but with much worse performance than custom RowMapper
return jdbcTemplate.query(query, params, BeanPropertyRowMapper.newInstance(Employee.class));
}
@Override
public Integer insertProject(Project project) {
MapSqlParameterSource params = new MapSqlParameterSource()
.addValue("name", project.getName())
.addValue("datestarted", project.getDate());
return insertIntoProject.executeAndReturnKey(params).intValue();
}
@Override
public List<Integer> insertProjects(List<Project> projects) {
MapSqlParameterSource[] paramsList = projects
.stream()
.map(project -> new MapSqlParameterSource()
.addValue("name", project.getName())
.addValue("datestarted", project.getDate()))
.toArray(MapSqlParameterSource[]::new);
// NOTE: Here we used SimpleJdbcInsert to insert the rows, but you can also use more traditional way
// by specifying the statment to be executed (handy when you need to do some customizations of the statement).
// See insertDepartments() method for an example.
insertIntoProject.executeBatch(paramsList);
// FIXME JDBCTemplate cannot return IDs for every row after batch update!!
return null;
}
@Override
public void updateEmployee(Employee employeeToUpdate) {
logger.info("Updating employee using JDBC Template");
String updateStatement = " UPDATE EMPLOYEE SET " +
" department_pid = :department_pid, " +
" name = :name," +
" surname = :surname," +
" email = :email," +
" salary = :salary" +
" WHERE pid = :pid";
MapSqlParameterSource params = new MapSqlParameterSource()
.addValue("department_pid", employeeToUpdate.getDepartmentPid())
.addValue("name", employeeToUpdate.getName())
.addValue("surname", employeeToUpdate.getSurname())
.addValue("email", employeeToUpdate.getEmail())
.addValue("salary", employeeToUpdate.getSalary())
.addValue("pid", employeeToUpdate.getPid());
jdbcTemplate.update(updateStatement, params);
}
@Override
public List<ProjectsWithCostsGreaterThanOutput> getProjectsWithCostsGreaterThan(int totalCostBoundary) {
String query;
query = "WITH project_info AS (\n" +
" SELECT project.pid project_pid, project.name project_name, salary monthly_cost, company.name company_name\n" +
" FROM project\n" +
" JOIN projectemployee ON project.pid = projectemployee.project_pid\n" +
" JOIN employee ON projectemployee.employee_pid = employee.pid\n" +
" LEFT JOIN department ON employee.department_pid = department.pid\n" +
" LEFT JOIN company ON department.company_pid = company.pid\n" +
"),\n" +
"project_cost AS (\n" +
" SELECT project_pid, sum(monthly_cost) total_cost\n" +
" FROM project_info GROUP BY project_pid\n" +
")\n" +
"SELECT project_name, total_cost, company_name, sum(monthly_cost) company_cost FROM project_info\n" +
" JOIN project_cost USING (project_pid)\n" +
"WHERE total_cost > :totalCostBoundary\n" +
"GROUP BY project_name, total_cost, company_name\n" +
"ORDER BY company_name";
MapSqlParameterSource params = new MapSqlParameterSource()
.addValue("totalCostBoundary", totalCostBoundary);
RowMapper<ProjectsWithCostsGreaterThanOutput> mapper = (rs, rowNum) -> {
ProjectsWithCostsGreaterThanOutput row = new ProjectsWithCostsGreaterThanOutput();
row.setProjectName(rs.getString("project_name"));
row.setTotalCost(rs.getBigDecimal("total_cost"));
row.setCompanyName(rs.getString("company_name"));
row.setCompanyCost(rs.getBigDecimal("company_cost"));
return row;
};
return jdbcTemplate.query(query, params, mapper);
}
@Override
public Employee findEmployee(Integer pid) {
String query;
query = "SELECT pid, email, name, salary, surname, department_pid AS departmentPid FROM employee WHERE pid = :pid";
MapSqlParameterSource params = new MapSqlParameterSource()
.addValue("pid", pid);
// using BeanPropertyRowMapper is easier, but with much worse performance than custom RowMapper
return jdbcTemplate.queryForObject(query, params, BeanPropertyRowMapper.newInstance(Employee.class));
}
@Override
public RegisterEmployeeOutput callRegisterEmployee(String name, String surname, String email, BigDecimal salary, String departmentName, String companyName) {
String query;
//noinspection SqlResolve
query = "SELECT employee_id, department_id, company_id FROM register_employee(\n" +
" _name := :name, \n" +
" _surname := :surname, \n" +
" _email := :email, \n" +
" _salary := :salary, \n" +
" _department_name := :departmentName, \n" +
" _company_name := :companyName\n" +
")";
MapSqlParameterSource params = new MapSqlParameterSource()
.addValue("name", name)
.addValue("surname", surname)
.addValue("email", email)
.addValue("salary", salary)
.addValue("departmentName", departmentName)
.addValue("companyName", companyName);
RowMapper<RegisterEmployeeOutput> mapper = (rs, rowNum) -> {
RegisterEmployeeOutput row = new RegisterEmployeeOutput();
row.setEmployeePid(rs.getInt("employee_id"));
row.setDepartmentPid(rs.getInt("department_id"));
row.setCompanyPid(rs.getInt("company_id"));
return row;
};
return jdbcTemplate.queryForObject(query, params, mapper);
}
@Override
public Integer getProjectsCount() {
String query = "SELECT count(*) FROM project";
return jdbcTemplate.getJdbcOperations().queryForObject(query, Integer.class);
}
@Override
public List<Department> findDepartmentsOfCompany(Company company) {
String query = "SELECT pid, company_pid, name" +
" FROM department " +
" WHERE company_pid = :pid" +
" ORDER BY pid";
MapSqlParameterSource params = new MapSqlParameterSource()
.addValue("pid", company.getPid());
return jdbcTemplate.query(query, params, BeanPropertyRowMapper.newInstance(Department.class));
}
@Override
public void deleteDepartments(List<Department> departmentsToDelete) {
List<Integer> ids = departmentsToDelete.stream()
.map(Department::getPid)
.collect(Collectors.toList());
MapSqlParameterSource params = new MapSqlParameterSource()
.addValue("pids", ids);
String updateStatement = "DELETE FROM department WHERE pid IN (:pids)";
jdbcTemplate.update(updateStatement, params);
}
@Override
public void updateDepartments(List<Department> departmentsToUpdate) {
//language=PostgreSQL
String updateStatement = "UPDATE department SET " +
"company_pid = :company_pid, " +
"name = :name " +
"WHERE pid = :pid";
batchUpdateDepartments(departmentsToUpdate, updateStatement);
}
@Override
public void insertDepartments(List<Department> departmentsToInsert) {
//language=PostgreSQL
String insertStatement = " INSERT INTO department (company_pid, name) " +
" VALUES (:company_pid, :name)";
batchUpdateDepartments(departmentsToInsert, insertStatement);
}
@Override
public Project findProject(Integer pid) {
String query;
query = "SELECT pid, name, datestarted AS date" +
" FROM project " +
" WHERE pid = :pid";
MapSqlParameterSource params = new MapSqlParameterSource()
.addValue("pid", pid);
// using BeanPropertyRowMapper is easier, but with much worse performance than custom RowMapper
return jdbcTemplate.queryForObject(query, params, BeanPropertyRowMapper.newInstance(Project.class));
}
private void batchUpdateDepartments(List<Department> departmentsToInsert, String statement) {
MapSqlParameterSource[] paramsList = departmentsToInsert
.stream()
.map(department -> new MapSqlParameterSource()
.addValue("pid", department.getPid())
.addValue("company_pid", department.getCompanyPid())
.addValue("name", department.getName())
)
.toArray(MapSqlParameterSource[]::new);
jdbcTemplate.batchUpdate(statement, paramsList);
}
}