Examples with SpannerCustomConverter org.springframework.cloud.gcp.data.spanner.core.convert.SpannerCustomConverter used on opensource projects

Example 1 with SpannerCustomConverter

use of org.springframework.cloud.gcp.data.spanner.core.convert.SpannerCustomConverter in project spring-cloud-gcp by spring-cloud.

the class SpannerStatementQueryExecutor method buildQuery.

/**
 * Builds a query that returns the rows associated with a key set with additional SQL-where.
 * The {@link org.springframework.cloud.gcp.data.spanner.core.mapping.Where} of the {@code persistentEntity} parameter
 * is ignored, you should pass the SQL-where as a {@code whereClause} parameter.
 * The secondary {@code index} will be used instead of the table name when the corresponding parameter is not null.
 * @param keySet the key set whose members to get.
 * @param persistentEntity the persistent entity of the table.
 * @param <T> the type of the persistent entity
 * @param writeConverter a converter to convert key values as needed to bind to the query statement.
 * @param mappingContext mapping context
 * @param whereClause SQL where clause
 * @param index the secondary index name
 * @return the Spanner statement to perform the retrieval.
 */
public static <T> Statement buildQuery(KeySet keySet, SpannerPersistentEntity<T> persistentEntity, SpannerCustomConverter writeConverter, SpannerMappingContext mappingContext, String whereClause, String index) {
    List<String> orParts = new ArrayList<>();
    List<String> tags = new ArrayList<>();
    List keyParts = new ArrayList();
    int tagNum = 0;
    List<SpannerPersistentProperty> keyProperties = persistentEntity.getFlattenedPrimaryKeyProperties();
    for (Key key : keySet.getKeys()) {
        StringJoiner andJoiner = new StringJoiner(" AND ");
        Iterator parentKeyParts = key.getParts().iterator();
        while (parentKeyParts.hasNext()) {
            SpannerPersistentProperty keyProp = keyProperties.get(tagNum % keyProperties.size());
            String tagName = "tag" + tagNum;
            andJoiner.add(keyProp.getColumnName() + " = @" + tagName);
            tags.add(tagName);
            keyParts.add(parentKeyParts.next());
            tagNum++;
        }
        orParts.add(andJoiner.toString());
    }
    String keyClause = orParts.stream().map(s -> "(" + s + ")").collect(Collectors.joining(" OR "));
    String condition = combineWithAnd(keyClause, whereClause);
    String sb = "SELECT " + getColumnsStringForSelect(persistentEntity, mappingContext, true) + " FROM " + (StringUtils.isEmpty(index) ? persistentEntity.tableName() : String.format("%s@{FORCE_INDEX=%s}", persistentEntity.tableName(), index)) + (condition.isEmpty() ? "" : " WHERE " + condition);
    return buildStatementFromSqlWithArgs(sb, tags, null, writeConverter, keyParts.toArray(), null);
}