add Spring Data

build.gradle

@@ -33,6 +33,11 @@ dependencies {
     }
 
     implementation 'org.springframework:spring-context:5.2.5.RELEASE'
+
+    // compileOnly потому, что в spigot/paper уже есть драйвер для MySQL 5
+    compileOnly 'mysql:mysql-connector-java:5.1.48'
+    implementation 'org.hibernate:hibernate-core:5.4.14.Final'
+    implementation 'org.springframework.data:spring-data-jpa:2.2.6.RELEASE'
 }
 
 processResources {

src/main/java/ru/dmitriymx/plugin/BanHammerPlugin.java

@@ -19,9 +19,6 @@ public class BanHammerPlugin extends JavaPlugin {
 
 		ApplicationContext context = createSpringContext();
 
-		//TODO для демонстрации
-		getLogger().info("dburl: " + context.getBean("databaseUrl", String.class));
-
 		this.getCommand("ban").setExecutor(context.getBean(BanCommand.class));
 		this.getCommand("unban").setExecutor(context.getBean(UnbanCommand.class));
 	}

src/main/java/ru/dmitriymx/plugin/command/BanCommand.java

@@ -6,6 +6,7 @@ import org.bukkit.command.CommandSender;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.stereotype.Component;
+import ru.dmitriymx.plugin.service.BannedUserService;
 
 import java.util.logging.Logger;
 
@@ -13,16 +14,26 @@ import java.util.logging.Logger;
 public class BanCommand implements CommandExecutor {
 
 	private final Logger logger;
+	private final BannedUserService service;
 
 	@Autowired
 	@SuppressWarnings("SpringJavaInjectionPointsAutowiringInspection")
-	public BanCommand(@Qualifier("bukkitLogger") Logger logger) {
+	public BanCommand(@Qualifier("bukkitLogger") Logger logger, BannedUserService service) {
 		this.logger = logger;
+		this.service = service;
 	}
 
 	@Override
 	public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
 		logger.info("Call '" + label + "' command");
+
+		if (args.length == 0) {
+			return true;
+		}
+
+		boolean result = service.inBanned(args[0]);
+		logger.info("Player '" + args[0] + "': " + (result ? "is banned" : "not banned"));
+
 		return true;
 	}
 }

src/main/java/ru/dmitriymx/plugin/config/SpringConfig.java

@@ -1,12 +1,20 @@
 package ru.dmitriymx.plugin.config;
 
+import org.hibernate.jpa.HibernatePersistenceProvider;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.ComponentScan;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
+import org.springframework.jdbc.datasource.DriverManagerDataSource;
+import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
+
+import javax.sql.DataSource;
+import java.util.Properties;
 
 @Configuration
-@ComponentScan("ru.dmitriymx.plugin")
+@ComponentScan(basePackages = "ru.dmitriymx.plugin")
+@EnableJpaRepositories(basePackages = "ru.dmitriymx.plugin.repository")
 public class SpringConfig {
 
 	@Value("${database.url}")
@@ -18,9 +26,44 @@ public class SpringConfig {
 	@Value("${database.password}")
 	private String databasePassword;
 
-	//TODO для демонстрации
-	@Bean("databaseUrl")
-	public String getDatabaseUrl() {
-		return databaseUrl;
+	@Value("${database.hibernate.show-sql}")
+	private String showSql;
+
+	@Bean
+	public DataSource dataSource() {
+		DriverManagerDataSource dataSource = new DriverManagerDataSource();
+		dataSource.setUrl(databaseUrl);
+		dataSource.setUsername(databaseUser);
+		dataSource.setPassword(databasePassword);
+
+		return dataSource;
+	}
+
+	@Bean
+	public LocalContainerEntityManagerFactoryBean entityManagerFactory(DataSource dataSource) {
+		LocalContainerEntityManagerFactoryBean entityManagerFactoryBean = new LocalContainerEntityManagerFactoryBean();
+		entityManagerFactoryBean.setDataSource(dataSource);
+		entityManagerFactoryBean.setPersistenceProviderClass(HibernatePersistenceProvider.class);
+		entityManagerFactoryBean.setPackagesToScan("ru.dmitriymx.plugin.entity");
+		entityManagerFactoryBean.setJpaProperties(hibernateJpaProperties());
+
+		return entityManagerFactoryBean;
+	}
+
+	private Properties hibernateJpaProperties() {
+		Properties properties = new Properties();
+		properties.setProperty("hibernate.dialect", "org.hibernate.dialect.MySQL5Dialect");
+
+		// показывать выполняемые SQL в логах
+		properties.setProperty("hibernate.show_sql", showSql);
+
+		// validate: проверяет соответствие схемы таблиц с имеющимися Entity классами
+		// update: при необходимости, обновляет схемы таблиц в соответствии с имеющимися Entity классами
+		// create: создаёт схемы таблиц, уничтожая имеющиеся данные
+		// create-drop: уничтожает таблицы, если все соединения закрываются; обычно происходит при завершеннии работы приложения
+		// none: ничего не делать
+		properties.setProperty("hibernate.hbm2ddl.auto", "update");
+
+		return properties;
 	}
 }

src/main/java/ru/dmitriymx/plugin/entity/BannedUserEntity.java

@@ -0,0 +1,60 @@
+package ru.dmitriymx.plugin.entity;
+
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import javax.persistence.Id;
+import javax.persistence.Table;
+import java.util.Objects;
+
+@Entity
+@Table(name = "ban_users")
+public class BannedUserEntity {
+
+	@Id
+	private Integer id;
+
+	@Column(
+			name = "player_name",
+			unique = true,
+			nullable = false,
+			length = 16
+	)
+	private String playerName;
+
+	public Integer getId() {
+		return id;
+	}
+
+	public void setId(Integer id) {
+		this.id = id;
+	}
+
+	public String getPlayerName() {
+		return playerName;
+	}
+
+	public void setPlayerName(String playerName) {
+		this.playerName = playerName;
+	}
+
+	@Override
+	public boolean equals(Object o) {
+		if (this == o) return true;
+		if (!(o instanceof BannedUserEntity)) return false;
+		BannedUserEntity that = (BannedUserEntity) o;
+		return playerName.equals(that.playerName);
+	}
+
+	@Override
+	public int hashCode() {
+		return Objects.hash(playerName);
+	}
+
+	@Override
+	public String toString() {
+		return "BannedUserEntity{" +
+				"id=" + id +
+				", playerName='" + playerName + '\'' +
+				'}';
+	}
+}

src/main/java/ru/dmitriymx/plugin/repository/BannedUserRepository.java

@@ -0,0 +1,13 @@
+package ru.dmitriymx.plugin.repository;
+
+import org.springframework.data.repository.CrudRepository;
+import org.springframework.stereotype.Repository;
+import ru.dmitriymx.plugin.entity.BannedUserEntity;
+
+import java.util.Optional;
+
+@Repository
+public interface BannedUserRepository extends CrudRepository<BannedUserEntity, Integer> {
+
+	Optional<BannedUserEntity> findByPlayerName(String playerName);
+}

src/main/java/ru/dmitriymx/plugin/service/BannedUserService.java

@@ -0,0 +1,25 @@
+package ru.dmitriymx.plugin.service;
+
+import org.bukkit.entity.Player;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+import ru.dmitriymx.plugin.repository.BannedUserRepository;
+
+@Service
+public class BannedUserService {
+
+	private final BannedUserRepository repository;
+
+	@Autowired
+	public BannedUserService(BannedUserRepository repository) {
+		this.repository = repository;
+	}
+
+	public boolean inBanned(Player player) {
+		return inBanned(player.getName());
+	}
+
+	public boolean inBanned(String playerName) {
+		return repository.findByPlayerName(playerName.toLowerCase()).isPresent();
+	}
+}

src/main/resources/config.yml

@@ -1,4 +1,6 @@
 database:
-  url: some-url
-  user: some-user
-  password: some-password
+  url: jdbc:mysql://localhost:3306/ban_hammer
+  user: root
+  password: secret
+  hibernate:
+    show-sql: true