private void deleteJoinedRows(
Mapping particle, TableJoin tableJoin, Map<SQLIdentifier, Object> joinKeyColToValue)
throws FeatureStoreException {
TableName joinTable = tableJoin.getToTable();
if (particle instanceof CompoundMapping) {
CompoundMapping cm = (CompoundMapping) particle;
for (Mapping child : cm.getParticles()) {
deleteJoinedRows(child, joinKeyColToValue);
}
}
// DELETE join rows
PreparedStatement stmt = null;
try {
StringBuilder sql = new StringBuilder("DELETE FROM " + joinTable + " WHERE");
boolean first = true;
for (Entry<SQLIdentifier, Object> joinKey : joinKeyColToValue.entrySet()) {
if (!first) {
sql.append(" AND");
}
sql.append(' ');
sql.append(joinKey.getKey());
sql.append("=?");
first = false;
}
stmt = conn.prepareStatement(sql.toString());
int i = 1;
for (Entry<SQLIdentifier, Object> joinKey : joinKeyColToValue.entrySet()) {
stmt.setObject(i++, joinKey.getValue());
}
LOG.debug("Executing DELETE (joined rows): " + stmt);
stmt.executeUpdate();
} catch (SQLException e) {
LOG.error(e.getMessage(), e);
throw new FeatureStoreException(e.getMessage(), e);
} finally {
JDBCUtils.close(stmt);
}
}
private void deleteJoinedRows(Mapping particle, Map<SQLIdentifier, Object> keyColToValue)
throws FeatureStoreException {
// TODO: After FeatureTypeJoin is introduced, rework this case (may allow joins)
if (particle instanceof FeatureMapping) {
return;
}
// determine and delete joined rows
if (particle.getJoinedTable() != null && !particle.getJoinedTable().isEmpty()) {
TableJoin tableJoin = particle.getJoinedTable().get(0);
PreparedStatement stmt = null;
try {
StringBuilder sql = new StringBuilder("SELECT ");
boolean first = true;
for (SQLIdentifier selectColumn : tableJoin.getToColumns()) {
if (!first) {
sql.append(',');
} else {
first = false;
}
sql.append("X2.");
sql.append(selectColumn);
}
sql.append(" FROM ");
sql.append(tableJoin.getFromTable());
sql.append(" X1,");
sql.append(tableJoin.getToTable());
sql.append(" X2");
sql.append(" WHERE");
first = true;
int i = 0;
for (SQLIdentifier fromColumn : tableJoin.getFromColumns()) {
SQLIdentifier toColumn = tableJoin.getToColumns().get(i++);
if (!first) {
sql.append(',');
} else {
first = false;
}
sql.append(" X1.");
sql.append(fromColumn);
sql.append("=");
sql.append("X2.");
sql.append(toColumn);
first = false;
}
for (Entry<SQLIdentifier, Object> joinKey : keyColToValue.entrySet()) {
sql.append(" AND X1.");
sql.append(joinKey.getKey());
sql.append("=?");
first = false;
}
stmt = conn.prepareStatement(sql.toString());
i = 1;
for (Entry<SQLIdentifier, Object> joinKey : keyColToValue.entrySet()) {
stmt.setObject(i++, joinKey.getValue());
}
LOG.debug("Executing SELECT (following join): " + stmt);
ResultSet rs = stmt.executeQuery();
while (rs.next()) {
Map<SQLIdentifier, Object> joinKeyToValue = new HashMap<SQLIdentifier, Object>();
i = 1;
for (SQLIdentifier toColumn : tableJoin.getToColumns()) {
joinKeyToValue.put(toColumn, rs.getObject(i++));
}
deleteJoinedRows(particle, tableJoin, joinKeyToValue);
}
} catch (SQLException e) {
LOG.error(e.getMessage(), e);
throw new FeatureStoreException(e.getMessage(), e);
} finally {
JDBCUtils.close(stmt);
}
} else {
// process compound particle structure
if (particle instanceof CompoundMapping) {
CompoundMapping cm = (CompoundMapping) particle;
for (Mapping child : cm.getParticles()) {
deleteJoinedRows(child, keyColToValue);
}
}
}
}
