JPA Counting Row Implementation
This commit is contained in:
technoddy
parent
73c2c6bc67
commit
58d6a02c35
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package com.baeldung.countrows;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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@SpringBootApplication
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public class AccountStatsApplication {
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public static void main(String[] args) {
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SpringApplication.run(AccountStatsApplication.class, args);
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}
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}
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package com.baeldung.countrows.entity;
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import javax.persistence.*;
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import java.security.PrivateKey;
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import java.sql.Timestamp;
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import java.time.Instant;
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import java.util.Date;
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@Entity
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@Table(name="ACCOUNTS")
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public class Account {
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@Id
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@GeneratedValue(strategy= GenerationType.SEQUENCE, generator = "accounts_seq")
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@SequenceGenerator(name = "accounts_seq", sequenceName = "accounts_seq", allocationSize = 1)
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@Column(name = "user_id")
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private int userId;
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private String username;
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private String password;
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private String email;
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private Timestamp createdOn;
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private Timestamp lastLogin;
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@OneToOne
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@JoinColumn(name = "permissions_id")
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private Permission permission;
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public int getUserId() {
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return userId;
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}
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public void setUserId(int userId) {
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this.userId = userId;
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}
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public String getUsername() {
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return username;
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}
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public void setUsername(String username) {
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this.username = username;
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}
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public String getPassword() {
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return password;
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}
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public void setPassword(String password) {
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this.password = password;
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}
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public String getEmail() {
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return email;
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}
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public void setEmail(String email) {
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this.email = email;
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}
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public Timestamp getCreatedOn() {
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return createdOn;
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}
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public void setCreatedOn(Timestamp createdOn) {
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this.createdOn = createdOn;
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}
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public Timestamp getLastLogin() {
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return lastLogin;
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}
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public void setLastLogin(Timestamp lastLogin) {
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this.lastLogin = lastLogin;
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}
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public Permission getPermission() {
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return permission;
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}
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public void setPermission(Permission permission) {
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this.permission = permission;
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}
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@Override
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public String toString() {
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return "Account{" +
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"userId=" + userId +
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", username='" + username + '\'' +
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", password='" + password + '\'' +
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", email='" + email + '\'' +
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", createdOn=" + createdOn +
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", lastLogin=" + lastLogin +
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", permission=" + permission +
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'}';
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}
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}
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package com.baeldung.countrows.entity;
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import javax.persistence.*;
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@Entity
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@Table(name="PERMISSIONS")
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public class Permission {
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@Id
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@GeneratedValue(strategy= GenerationType.SEQUENCE, generator = "permissions_id_sq")
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@SequenceGenerator(name = "permissions_id_sq", sequenceName = "permissions_id_sq", allocationSize = 1)
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private int id;
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private String type;
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public int getId() {
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return id;
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}
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public void setId(int id) {
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this.id = id;
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}
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public String getType() {
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return type;
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}
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public void setType(String type) {
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this.type = type;
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}
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@Override
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public String toString() {
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return "Permission{" +
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"id=" + id +
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", type='" + type + '\'' +
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'}';
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}
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}
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package com.baeldung.countrows.repository;
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import com.baeldung.countrows.entity.Account;
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import com.baeldung.countrows.entity.Permission;
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import org.springframework.data.jpa.repository.JpaRepository;
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import org.springframework.data.jpa.repository.Query;
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import org.springframework.data.repository.query.Param;
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import org.springframework.stereotype.Repository;
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import java.sql.Timestamp;
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import java.util.Date;
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import java.util.List;
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@Repository
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public interface AccountRepository extends JpaRepository<Account, Integer> {
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long countByUsername(String username);
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long countByPermission(Permission permission);
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long countByPermissionAndCreatedOnGreaterThan(Permission permission, Timestamp ts);
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}
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package com.baeldung.countrows.repository;
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import org.springframework.data.jpa.repository.JpaRepository;
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import org.springframework.stereotype.Repository;
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import com.baeldung.countrows.entity.Permission;
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@Repository
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public interface PermissionRepository extends JpaRepository<Permission, Integer> {
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Permission findByType(String type);
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}
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package com.baeldung.countrows.service;
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import java.sql.Timestamp;
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import java.text.ParseException;
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import java.text.SimpleDateFormat;
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import java.util.ArrayList;
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import java.util.Date;
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import java.util.List;
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import javax.persistence.EntityManager;
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import javax.persistence.PersistenceContext;
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import javax.persistence.Query;
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import javax.persistence.criteria.*;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.stereotype.Service;
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import com.baeldung.countrows.entity.Account;
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import com.baeldung.countrows.entity.Permission;
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import com.baeldung.countrows.repository.AccountRepository;
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import com.baeldung.countrows.repository.PermissionRepository;
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@Service
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public class AccountStatsLogic {
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@Autowired
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private AccountRepository accountRepository;
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@PersistenceContext
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private EntityManager entityManager;
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@Autowired
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private PermissionRepository permissionRepository;
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public long getAccountCount(){
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return accountRepository.count();
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}
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public long getAccountCountByUsername(String username){
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return accountRepository.countByUsername(username);
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}
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public long getAccountCountByPermission(Permission permission){
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return accountRepository.countByPermission(permission);
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}
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public long getAccountCountByPermissionAndCreatedOn(Permission permission, Date date) throws ParseException {
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return accountRepository.countByPermissionAndCreatedOnGreaterThan(permission, new Timestamp(date.getTime()));
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}
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public long getAccountsUsingCQ() throws ParseException {
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// creating criteria builder and query
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CriteriaBuilder builder = entityManager.getCriteriaBuilder();
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CriteriaQuery<Long> criteriaQuery = builder.createQuery(Long.class);
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Root<Account> accountRoot = criteriaQuery.from(Account.class);
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// select query
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criteriaQuery
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.select(builder.count(accountRoot));
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// execute and get the result
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return entityManager.createQuery(criteriaQuery).getSingleResult();
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}
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public long getAccountsByPermissionUsingCQ(Permission permission) throws ParseException {
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CriteriaBuilder builder = entityManager.getCriteriaBuilder();
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CriteriaQuery<Long> criteriaQuery = builder.createQuery(Long.class);
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Root<Account> accountRoot = criteriaQuery.from(Account.class);
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List<Predicate> predicateList = new ArrayList<>(); // list of predicates that will go in where clause
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predicateList.add(builder.equal(accountRoot.get("permission"), permission));
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criteriaQuery
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.select(builder.count(accountRoot))
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.where(builder.and(predicateList.toArray(new Predicate[0])));
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return entityManager.createQuery(criteriaQuery).getSingleResult();
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}
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public long getAccountsByPermissionAndCreateOnUsingCQ(Permission permission, Date date) throws ParseException {
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// creating criteria builder and query
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CriteriaBuilder builder = entityManager.getCriteriaBuilder(); // create builder
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CriteriaQuery<Long> criteriaQuery = builder.createQuery(Long.class);// query instance
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Root<Account> accountRoot = criteriaQuery.from(Account.class); // root instance
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// list of predicates that will go in where clause
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List<Predicate> predicateList = new ArrayList<>();
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predicateList.add(builder.equal(accountRoot.get("permission"), permission));
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predicateList.add(builder.greaterThan(accountRoot.get("createdOn"), new Timestamp(date.getTime())));
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// select query
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criteriaQuery
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.select(builder.count(accountRoot))
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.where(builder.and(predicateList.toArray(new Predicate[0])));
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// execute and get the result
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return entityManager.createQuery(criteriaQuery).getSingleResult();
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}
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public long getAccountsUsingJPQL() throws ParseException {
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Query query = entityManager.createQuery("SELECT COUNT(*) FROM Account a");
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return (long) query.getSingleResult();
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}
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public long getAccountsByPermissionUsingJPQL(Permission permission) throws ParseException {
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Query query = entityManager.createQuery("SELECT COUNT(*) FROM Account a WHERE a.permission = ?1");
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query.setParameter(1, permission);
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return (long) query.getSingleResult();
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}
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public long getAccountsByPermissionAndCreatedOnUsingJPQL(Permission permission, Date date) throws ParseException {
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Query query = entityManager.createQuery("SELECT COUNT(*) FROM Account a WHERE a.permission = ?1 and a.createdOn > ?2");
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query.setParameter(1, permission);
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query.setParameter(2, new Timestamp(date.getTime()));
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return (long) query.getSingleResult();
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}
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private static Date getDate() throws ParseException {
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SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
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Date parsedDate = dateFormat.parse("2023-04-29");
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System.out.println("parseDate: "+parsedDate);
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return parsedDate;
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}
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}
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package com.baeldung.boot.countrows.accountstatslogic;
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import static org.assertj.core.api.AssertionsForClassTypes.assertThat;
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import java.sql.Timestamp;
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import java.text.ParseException;
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import java.text.SimpleDateFormat;
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import java.time.Instant;
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import java.util.Date;
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import java.util.UUID;
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import org.junit.jupiter.api.AfterEach;
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import org.junit.jupiter.api.BeforeAll;
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import org.junit.jupiter.api.BeforeEach;
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import org.junit.jupiter.api.Test;
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import com.baeldung.countrows.AccountStatsApplication;
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import com.baeldung.countrows.entity.Account;
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import com.baeldung.countrows.entity.Permission;
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import com.baeldung.countrows.repository.AccountRepository;
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import com.baeldung.countrows.repository.PermissionRepository;
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import com.baeldung.countrows.service.AccountStatsLogic;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.boot.test.context.SpringBootTest;
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import org.springframework.boot.test.mock.mockito.MockBean;
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@SpringBootTest(classes = AccountStatsApplication.class)
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class AccountStatsUnitTests {
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@Autowired
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private PermissionRepository permissionRepository;
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@Autowired
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private AccountRepository accountRepository;
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@Autowired
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private AccountStatsLogic accountStatsLogic;
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@AfterEach
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public void afterEach(){
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accountRepository.deleteAll();
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permissionRepository.deleteAll();
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}
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@Test
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public void givenAccountInTable_whenPerformCount_returnsAppropriateCount(){
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savePermissions();
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Account account = saveAccount();
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assertThat(accountStatsLogic.getAccountCount()).isEqualTo(1);
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}
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@Test
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public void givenAccountInTable_whenPerformCountByUsernameOrPermission_returnsAppropriateCount() {
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savePermissions();
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Account account = saveAccount();
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assertThat(accountStatsLogic.getAccountCountByUsername(account.getUsername())).isEqualTo(1);
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assertThat(accountStatsLogic.getAccountCountByPermission(account.getPermission())).isEqualTo(1);
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}
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@Test
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public void givenAccountInTable_whenPerformCountByPermissionAndCreatedOn_returnsAppropriateCount() throws ParseException {
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savePermissions();
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Account account = saveAccount();
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long count = accountStatsLogic.getAccountCountByPermissionAndCreatedOn(account.getPermission(), account.getCreatedOn());
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assertThat(count).isEqualTo(1);
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}
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@Test
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public void givenAccountInTable_whenPerformCountUsingCQ_returnsAppropriateCount() throws ParseException {
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savePermissions();
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Account account = saveAccount();
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long count = accountStatsLogic.getAccountsUsingCQ();
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assertThat(count).isEqualTo(1);
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}
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@Test
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public void givenAccountInTable_whenPerformCountByPermissionUsingCQ_returnsAppropriateCount() throws ParseException {
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savePermissions();
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Account account = saveAccount();
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long count = accountStatsLogic.getAccountsByPermissionUsingCQ(account.getPermission());
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assertThat(count).isEqualTo(1);
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}
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@Test
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public void givenAccountInTable_whenPerformCountByPermissionAndCreatedOnUsingCQ_returnsAppropriateCount() throws ParseException {
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savePermissions();
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Account account = saveAccount();
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long count = accountStatsLogic.getAccountsByPermissionAndCreateOnUsingCQ(account.getPermission(), account.getCreatedOn());
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assertThat(count).isEqualTo(1);
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}
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@Test
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public void givenAccountInTable_whenPerformCountUsingJPQL_returnsAppropriateCount() throws ParseException {
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savePermissions();
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Account account = saveAccount();
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long count = accountStatsLogic.getAccountsUsingJPQL();
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assertThat(count).isEqualTo(1);
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}
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@Test
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public void givenAccountInTable_whenPerformCountByPermissionUsingJPQL_returnsAppropriateCount() throws ParseException {
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savePermissions();
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Account account = saveAccount();
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long count = accountStatsLogic.getAccountsByPermissionUsingJPQL(account.getPermission());
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assertThat(count).isEqualTo(1);
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}
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@Test
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public void givenAccountInTable_whenPerformCountByPermissionAndCreatedOnUsingJPQL_returnsAppropriateCount() throws ParseException {
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savePermissions();
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Account account = saveAccount();
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long count = accountStatsLogic.getAccountsByPermissionAndCreatedOnUsingJPQL(account.getPermission(), account.getCreatedOn());
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assertThat(count).isEqualTo(1);
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}
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private Account saveAccount(){
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return accountRepository.save(getAccount());
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}
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private void savePermissions(){
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Permission editor = new Permission();
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editor.setType("editor");
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permissionRepository.save(editor);
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Permission admin = new Permission();
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admin.setType("admin");
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permissionRepository.save(admin);
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}
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private static Date getDate() throws ParseException {
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SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
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Date parsedDate = dateFormat.parse("2023-04-29");
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return parsedDate;
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}
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private Account getAccount() {
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Permission permission = permissionRepository.findByType("admin");
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Account account = new Account();
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String seed = UUID.randomUUID().toString();
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account.setUsername("username_"+seed);
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account.setEmail("username_"+seed+"@gmail.com");
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account.setPermission(permission);
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account.setPassword("password_q1234");
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account.setCreatedOn(Timestamp.from(Instant.now()));
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account.setLastLogin(Timestamp.from(Instant.now()));
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return account;
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}
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}
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