Issue #4: Service zum Ermitteln von Studien hinzugefügt

src/main/java/DNPM/services/DefaultStudienService.java

@@ -0,0 +1,49 @@
+package DNPM.services;
+
+import org.springframework.jdbc.core.JdbcTemplate;
+import org.springframework.stereotype.Service;
+
+import javax.sql.DataSource;
+import java.util.List;
+
+@Service
+public class DefaultStudienService implements StudienService {
+
+    private final JdbcTemplate jdbcTemplate;
+
+    public DefaultStudienService(final DataSource dataSource) {
+        this.jdbcTemplate = new JdbcTemplate(dataSource);
+    }
+
+    @Override
+    public List<Studie> findAll() {
+        var sql = "SELECT property_catalogue_version.version_number, pcve.code, pcve.shortdesc, pcve.description FROM property_catalogue "
+        + "JOIN property_catalogue_version ON property_catalogue.id = property_catalogue_version.datacatalog_id "
+        + "JOIN property_catalogue_version_entry pcve ON property_catalogue_version.id = pcve.property_version_id "
+        + "WHERE property_catalogue.name = 'OS.Studien';";
+
+        return this.jdbcTemplate.query(sql, (resultSet, i) -> new Studie(
+                resultSet.getString(1),
+                resultSet.getString(2),
+                resultSet.getString(3),
+                resultSet.getInt(0)
+        ));
+    }
+
+    @Override
+    public List<Studie> findByQuery(String query) {
+        var sql = "SELECT property_catalogue_version.version_number, pcve.code, pcve.shortdesc, pcve.description FROM property_catalogue "
+                + "JOIN property_catalogue_version ON property_catalogue.id = property_catalogue_version.datacatalog_id "
+                + "JOIN property_catalogue_version_entry pcve ON property_catalogue_version.id = pcve.property_version_id "
+                + "WHERE property_catalogue.name = 'OS.Studien' AND (pcve.shortdesc LIKE ? OR pcve.description LIKE ?);";
+
+        var like = String.format("%%%s%%", query);
+
+        return this.jdbcTemplate.query(sql, new Object[]{like, like}, (resultSet, i) -> new Studie(
+                resultSet.getString(1),
+                resultSet.getString(2),
+                resultSet.getString(3),
+                resultSet.getInt(0)
+        ));
+    }
+}

src/main/java/DNPM/services/Studie.java

@@ -0,0 +1,31 @@
+package DNPM.services;
+
+public class Studie {
+    private final String code;
+    private final String shortDesc;
+    private final String description;
+    private final int version;
+
+    public Studie(final String code, final String shortDesc, final String description, final int version) {
+        this.code = code;
+        this.shortDesc = shortDesc;
+        this.description = description;
+        this.version = version;
+    }
+
+    public String getCode() {
+        return code;
+    }
+
+    public String getShortDesc() {
+        return shortDesc;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public int getVersion() {
+        return version;
+    }
+}

src/main/java/DNPM/services/StudienService.java

@@ -0,0 +1,11 @@
+package DNPM.services;
+
+import java.util.List;
+
+public interface StudienService {
+
+    List<Studie> findAll();
+
+    List<Studie> findByQuery(String query);
+
+}