我已经制作了一个基本的CRUD spring-boot应用程序,该应用程序连接到Postgresql数据库。 我通过我的employeeDao中的sql代码访问数据库,该代码稍后在Controller中通过employeeService类调用。 现在,我必须使用多线程方法来更新数据库,但是我不知道如何实现。
我做了一个taskExecutor,但是我真的不知道如何使用它。
公共执行器taskExecutor(){
final ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
executor.setCorePoolSize(2);
executor.setMaxPoolSize(2);
executor.setQueueCapacity(50);
executor.setThreadNamePrefix("EmployeeThread-");
executor.initialize();
return executor;
}
这是我的EmployeeDaoImpl:
public class EmployeeDaoImpl implements EmployeeDao{
public EmployeeDaoImpl(NamedParameterJdbcTemplate template) {
this.template = template;
}
NamedParameterJdbcTemplate template;
@Override
public List<Employee> findAll() {
return template.query("select * from employee",new EmployeeRowMapper());
}
@Override
public void insertEmployee(Employee emp) {
final String sql = "insert into employee(employeeId,employeeName ) values(:employeeId,:employeeName)";
KeyHolder holder = new GeneratedKeyHolder();
SqlParameterSource param = new MapSqlParameterSource()
.addValue("employeeId",emp.getEmployeeId())
.addValue("employeeName",emp.getEmployeeName());
template.update(sql,param,holder);
}
@Override
public void updateEmployee(Employee emp) {
final String sql = "update employee set employeeName=:employeeName where employeeId=:employeeId";
KeyHolder holder = new GeneratedKeyHolder();
SqlParameterSource param = new MapSqlParameterSource()
.addValue("employeeId",holder);
}
@Override
public void executeUpdateEmployee(Employee emp) {
final String sql = "update employee set employeeName=:employeeName where employeeId=:employeeId";
Map<String,Object> map=new HashMap<String,Object>();
map.put("employeeId",emp.getEmployeeId());
map.put("employeeName",emp.getEmployeeName());
template.execute(sql,map,new PreparedStatementCallback<Object>() {
@Override
public Object doInPreparedStatement(PreparedStatement ps)
throws SQLException,DataaccessException {
return ps.executeUpdate();
}
});
}
@Override
public void deleteEmployee(Employee emp) {
final String sql = "delete from employee where employeeId=:employeeId";
Map<String,emp.getEmployeeId());
template.execute(sql,DataaccessException {
return ps.executeUpdate();
}
});
}
}
这是我的控制器
@RestController
@RequestMapping("/postgressApp")
public class ApplicationController {
@Resource
EmployeeService employeeService;
@GetMapping(value = "/employeeList")
public List<Employee> getEmployees() {
return employeeService.findAll();
}
@PostMapping(value = "/createEmp")
public void createEmployee(@RequestBody Employee emp) {
employeeService.insertEmployee(emp);
}
@PutMapping(value = "/updateEmp")
public void updateEmployee(@RequestBody Employee emp) {
employeeService.updateEmployee(emp);
}
@PutMapping(value = "/executeUpdateEmp")
public void executeUpdateEmployee(@RequestBody Employee emp) {
employeeService.executeUpdateEmployee(emp);
}
@DeleteMapping(value = "/deleteEmpById")
public void deleteEmployee(@RequestBody Employee emp) {
employeeService.deleteEmployee(emp);
}
}
我是否应该更改代码以通过Crud存储库之类的另一种方法来更新数据库?