Implement SQL sinks

src/main/java/edu/ie3/datamodel/io/DbGridMetadata.java

@@ -0,0 +1,28 @@
+/*
+ * © 2023. TU Dortmund University,
+ * Institute of Energy Systems, Energy Efficiency and Energy Economics,
+ * Research group Distribution grid planning and operation
+*/
+package edu.ie3.datamodel.io;
+
+import static edu.ie3.datamodel.io.SqlUtils.quote;
+
+import java.util.UUID;
+import java.util.stream.Stream;
+
+/** Class for identification of entities and results from grids in SQL databases. */
+public record DbGridMetadata(String gridName, UUID uuid) {
+
+  public static final String GRID_TABLE = "grids";
+  public static final String GRID_NAME = "grid_name";
+  public static final String GRID_UUID = "grid_uuid";
+
+  public String toString() {
+    return GRID_NAME + "=" + gridName + ", " + GRID_UUID + "=" + uuid.toString();
+  }
+
+  /** @return Stream with grid uuid */
+  public Stream<String> getStreamForQuery() {
+    return Stream.of(quote(uuid.toString(), "'"));
+  }
+}

src/main/java/edu/ie3/datamodel/io/SqlUtils.java

@@ -0,0 +1,45 @@
+/*
+ * © 2023. TU Dortmund University,
+ * Institute of Energy Systems, Energy Efficiency and Energy Economics,
+ * Research group Distribution grid planning and operation
+*/
+package edu.ie3.datamodel.io;
+
+import java.util.Objects;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class SqlUtils {
+
+  protected static final Logger log = LoggerFactory.getLogger(SqlUtils.class);
+  private static final String endQueryCreateTable =
+      ")\n \t WITHOUT OIDS\n \t TABLESPACE pg_default;";
+
+  private SqlUtils() {
+    throw new IllegalStateException("Utility classes cannot be instantiated");
+  }
+
+  private static String beginQueryCreateTable(String schemaName, String tableName) {
+    return "CREATE TABLE " + schemaName + "." + tableName + "\n(\n";
+  }
+
+  /** @return query to create a SQL table for a grid */
+  public static String queryCreateGridTable(String schemaName) {
+    return beginQueryCreateTable(schemaName, DbGridMetadata.GRID_TABLE)
+        + "\tuuid uuid PRIMARY KEY,\n\tname TEXT NOT NULL\n"
+        + endQueryCreateTable;
+  }
+
+  /**
+   * To avoid data type conflicts while insertion into a SQL table all columns should be quoted.
+   *
+   * @return input with quoteSymbol
+   */
+  public static String quote(String input, String quoteSymbol) {
+    if (Objects.equals(input, "") || Objects.equals(input, "null")) {
+      return "NULL";
+    } else {
+      return input.matches("^\".*\"$") ? input : quoteSymbol + input + quoteSymbol;
+    }
+  }
+}

src/main/java/edu/ie3/datamodel/io/connectors/SqlConnector.java

@@ -61,15 +61,15 @@ public ResultSet executeQuery(Statement stmt, String query) throws SQLException
   /**
    * Executes an update query
    *
-   * @param updateQuery the query to execute
+   * @param query the query to execute
    * @return The number of updates or a negative number if the execution failed
    */
-  public int executeUpdate(String updateQuery) {
-    try (Statement stmt = getConnection().createStatement()) {
-      return stmt.executeUpdate(updateQuery);
+  public int executeUpdate(String query) throws SQLException {
+    try (Statement statement = getConnection().createStatement()) {
+      return statement.executeUpdate(query);
     } catch (SQLException e) {
-      log.error(String.format("Error at execution of query \"%1.127s\": ", updateQuery), e);
-      return -1;
+      throw new SQLException(
+          String.format("Error at execution of query, SQLReason: '%s'", e.getMessage()), e);
     }
   }
 
@@ -160,4 +160,28 @@ public Map<String, String> extractFieldMap(ResultSet rs) {
     }
     return insensitiveFieldsToAttributes;
   }
+
+  /**
+   * Executes a query to check if a table exists
+   *
+   * @param tableName Name of the table, that should be checked
+   * @return True, if the table exists
+   */
+  public boolean tableExistsSQL(String tableName) {
+    String query =
+        "SELECT count(*) "
+            + "FROM information_schema.tables "
+            + "WHERE table_name = ?"
+            + "LIMIT 1;";
+    try (PreparedStatement ps = getConnection().prepareStatement(query)) {
+      ps.setString(1, tableName);
+
+      ResultSet resultSet = ps.executeQuery();
+      resultSet.next();
+      return resultSet.getInt(1) != 0;
+    } catch (SQLException e) {
+      log.error("Error during execution of query {}", query, e);
+    }
+    return false;
+  }
 }

src/main/java/edu/ie3/datamodel/io/naming/DatabaseNamingStrategy.java

@@ -5,14 +5,24 @@
 */
 package edu.ie3.datamodel.io.naming;
 
+import static edu.ie3.datamodel.io.naming.EntityPersistenceNamingStrategy.logger;
+
 import edu.ie3.datamodel.io.naming.timeseries.ColumnScheme;
 import edu.ie3.datamodel.models.Entity;
+import edu.ie3.datamodel.models.timeseries.TimeSeries;
+import edu.ie3.datamodel.models.timeseries.TimeSeriesEntry;
+import edu.ie3.datamodel.models.timeseries.individual.IndividualTimeSeries;
+import edu.ie3.datamodel.models.timeseries.repetitive.LoadProfileInput;
+import edu.ie3.datamodel.models.value.Value;
 import java.util.Optional;
 
 /** A naming strategy for database entities */
 public class DatabaseNamingStrategy {
 
   private static final String TIME_SERIES_PREFIX = "time_series_";
+
+  private static final String LOAD_PROFILE_PREFIX = "load_profile_";
+
   private final EntityPersistenceNamingStrategy entityPersistenceNamingStrategy;
 
   public DatabaseNamingStrategy(EntityPersistenceNamingStrategy entityPersistenceNamingStrategy) {
@@ -42,7 +52,48 @@ public String getTimeSeriesEntityName(ColumnScheme columnScheme) {
     return TIME_SERIES_PREFIX + columnScheme.getScheme();
   }
 
+  /**
+   * Provides the name of a load profile given by the load profile key
+   *
+   * @param lpKey Load profile key
+   * @return the table name
+   */
+  private String getLoadProfileEntityName(String lpKey) {
+    return LOAD_PROFILE_PREFIX + lpKey;
+  }
+
+  /**
+   * Provides the name of a unique entity class.
+   *
+   * @param cls Class extends UniqueEntity
+   * @return the table name
+   */
   public Optional<String> getEntityName(Class<? extends Entity> cls) {
     return entityPersistenceNamingStrategy.getEntityName(cls);
   }
+
+  /**
+   * Provides the name of a time series. Used to determine the table name in SQL database.
+   *
+   * @param timeSeries to be named TimeSeries
+   * @return the table name
+   */
+  public <T extends TimeSeries<E, V>, E extends TimeSeriesEntry<V>, V extends Value>
+      Optional<String> getEntityName(T timeSeries) {
+    if (timeSeries instanceof IndividualTimeSeries individualTimeSeries) {
+      Optional<E> maybeFirstElement = individualTimeSeries.getEntries().stream().findFirst();
+      if (maybeFirstElement.isPresent()) {
+        Class<? extends Value> valueClass = maybeFirstElement.get().getValue().getClass();
+        return Optional.of(getTimeSeriesEntityName(ColumnScheme.parse(valueClass).orElseThrow()));
+      } else {
+        logger.error("Unable to determine content of time series {}", timeSeries);
+        return Optional.empty();
+      }
+    } else if (timeSeries instanceof LoadProfileInput loadProfileInput) {
+      return Optional.of(getLoadProfileEntityName(loadProfileInput.getType().getKey()));
+    } else {
+      logger.error("There is no naming strategy defined for {}", timeSeries);
+      return Optional.empty();
+    }
+  }
 }

src/main/java/edu/ie3/datamodel/io/processor/Processor.java

@@ -391,7 +391,6 @@ protected String processOperationTime(OperationTime operationTime, String fieldN
       operationTime
           .getEndDate()
           .ifPresent(endDate -> resultStringBuilder.append(processZonedDateTime(endDate)));
-
     return resultStringBuilder.toString();
   }
 

src/main/java/edu/ie3/datamodel/io/processor/ProcessorProvider.java

@@ -78,6 +78,19 @@ Try<LinkedHashMap<String, String>, ProcessorProviderException> handleEntity(T en
                     .transformF(ProcessorProviderException::new));
   }
 
+  public <T extends Entity> Set<LinkedHashMap<String, String>> handleEntities(List<T> entities)
+      throws ProcessorProviderException {
+    Set<T> setOfEntities = new HashSet<>(entities);
+    Set<LinkedHashMap<String, String>> setOfMaps = new HashSet<>();
+    for (T entity : setOfEntities) {
+      LinkedHashMap<String, String> entryResult = handleEntity(entity).getOrThrow();
+
+      /* Prepare the actual result and add them to the set of all results */
+      setOfMaps.add(new LinkedHashMap<>(entryResult));
+    }
+    return setOfMaps;
+  }
+
   /**
    * Get the correct entity processor
    *