Add the environment configuration.

src/main/java/space/kklochko/jdbc_hospital_example/config/env/DataBaseEnvConfig.java

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+package space.kklochko.jdbc_hospital_example.config.env;
+
+import io.github.cdimascio.dotenv.Dotenv;
+import lombok.Getter;
+import lombok.Setter;
+
+import java.util.Properties;
+
+@Setter
+@Getter
+public class DataBaseEnvConfig {
+    public String url;
+    public Properties properties;
+
+    public DataBaseEnvConfig() {
+        Dotenv dotenv = Dotenv
+                .configure()
+                .directory("config")
+                .filename("db")
+                .load();
+
+        setUrl(dotenv.get("JDBC_URL"));
+
+        Properties properties = new Properties();
+        properties.put("user", dotenv.get("USER"));
+        properties.put("password", dotenv.get("PASSWORD"));
+
+        setProperties(properties);
+    }
+}

src/main/java/space/kklochko/jdbc_hospital_example/config/factories/LoadDataBaseConfigFromEnvFile.java

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+package space.kklochko.jdbc_hospital_example.config.factories;
+
+import space.kklochko.jdbc_hospital_example.config.env.DataBaseEnvConfig;
+import space.kklochko.jdbc_hospital_example.config.models.DataBaseConfig;
+
+public class LoadDataBaseConfigFromEnvFile {
+    public DataBaseConfig load() {
+        DataBaseEnvConfig dbEnv = new DataBaseEnvConfig();
+        return new DataBaseConfig(dbEnv.getUrl(), dbEnv.getProperties());
+    }
+}

src/main/java/space/kklochko/jdbc_hospital_example/config/models/DataBaseConfig.java

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+package space.kklochko.jdbc_hospital_example.config.models;
+
+import lombok.Data;
+import java.util.Properties;
+
+@Data
+public class DataBaseConfig {
+    public String url;
+    public Properties properties;
+}