org.springframework.cloud.gcp.data.spanner.repository.query

Class SpannerStatementQueryExecutor

java.lang.Object

org.springframework.cloud.gcp.data.spanner.repository.query.SpannerStatementQueryExecutor

public class SpannerStatementQueryExecutor
extends Object

Executes Google Spanner query statements using PartTree parsed method definitions.

Author:

Chengyuan Zhao, Balint Pato

Constructor Summary

Constructors

Constructor and Description
SpannerStatementQueryExecutor()

Method Summary

Modifier and Type	Method and Description
static StringBuilder	applySort(org.springframework.data.domain.Sort sort, StringBuilder sql, Function<org.springframework.data.domain.Sort.Order,String> sortedPropertyNameFunction)
static com.google.cloud.spanner.Statement	buildStatementFromSqlWithArgs(String sql, List<String> tags, Object[] params) Creates a Spanner statement.
static <T> List<T>	executeQuery(Class<T> type, org.springframework.data.repository.query.parser.PartTree tree, Object[] params, SpannerOperations spannerOperations, SpannerMappingContext spannerMappingContext) Executes a PartTree-based query.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SpannerStatementQueryExecutor

public SpannerStatementQueryExecutor()

Method Detail

executeQuery

public static <T> List<T> executeQuery(Class<T> type,
                                       org.springframework.data.repository.query.parser.PartTree tree,
                                       Object[] params,
                                       SpannerOperations spannerOperations,
                                       SpannerMappingContext spannerMappingContext)

Executes a PartTree-based query.

Parameters:

type - the type of the underlying entity

tree - the parsed metadata of the query

params - the parameters of this specific query

spannerOperations - used to execute the query

spannerMappingContext - used to get metadata about the entity type

Returns:

A boolean for EXISTS queries, an integer for COUNT queries, and a List of entities otherwise.

Throws:

UnsupportedOperationException - for DELETE queries.

buildStatementFromSqlWithArgs

public static com.google.cloud.spanner.Statement buildStatementFromSqlWithArgs(String sql,
                                                                               List<String> tags,
                                                                               Object[] params)

Creates a Spanner statement.

Parameters:

sql - the SQL string with tags.

tags - the tags that appear in the SQL string.

params - the parameters to substitute the tags. The ordering must be the same as the tags.

Returns:

an SQL statement ready to use with Spanner.

Throws:

IllegalArgumentException - if the number of tags does not match the number of params, or if a param of an unsupported type is given.

applySort

public static StringBuilder applySort(org.springframework.data.domain.Sort sort,
                                      StringBuilder sql,
                                      Function<org.springframework.data.domain.Sort.Order,String> sortedPropertyNameFunction)