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{QueryResultCache} from \"./QueryResultCache\";\nimport {QueryResultCacheOptions} from \"./QueryResultCacheOptions\";\nimport {Table} from \"../schema-builder/table/Table\";\nimport {QueryRunner} from \"../query-runner/QueryRunner\";\nimport {Connection} from \"../connection/Connection\";\nimport {SqlServerDriver} from \"../driver/sqlserver/SqlServerDriver\";\nimport {MssqlParameter} from \"../driver/sqlserver/MssqlParameter\";\nimport {ObjectLiteral} from \"../common/ObjectLiteral\";\nimport {OracleDriver} from \"../driver/oracle/OracleDriver\";\nimport {PostgresConnectionOptions} from \"../driver/postgres/PostgresConnectionOptions\";\nimport {SqlServerConnectionOptions} from \"../driver/sqlserver/SqlServerConnectionOptions\";\n\n/**\n * Caches query result into current database, into separate table called \"query-result-cache\".\n */\nexport class DbQueryResultCache implements QueryResultCache {\n\n // -------------------------------------------------------------------------\n // Private properties\n // -------------------------------------------------------------------------\n\n private queryResultCacheTable: string;\n\n // -------------------------------------------------------------------------\n // Constructor\n // -------------------------------------------------------------------------\n\n constructor(protected connection: Connection) {\n\n const options = <SqlServerConnectionOptions|PostgresConnectionOptions>this.connection.driver.options;\n const cacheOptions = typeof this.connection.options.cache === \"object\" ? this.connection.options.cache : {}; \n const cacheTableName = cacheOptions.tableName || \"query-result-cache\";\n\n this.queryResultCacheTable = this.connection.driver.buildTableName(cacheTableName, options.schema, options.database);\n }\n\n // -------------------------------------------------------------------------\n // Public Methods\n // -------------------------------------------------------------------------\n\n /**\n * Creates a connection with given cache provider.\n */\n async connect(): Promise<void> {\n }\n\n /**\n * Disconnects with given cache provider.\n */\n async disconnect(): Promise<void> {\n }\n\n /**\n * Creates table for storing cache if it does not exist yet.\n */\n async synchronize(queryRunner?: QueryRunner): Promise<void> {\n queryRunner = this.getQueryRunner(queryRunner);\n const driver = this.connection.driver;\n const tableExist = await queryRunner.hasTable(this.queryResultCacheTable); // todo: table name should be configurable\n if (tableExist)\n return;\n\n await queryRunner.createTable(new Table(\n {\n name: this.queryResultCacheTable,\n columns: [\n {\n name: \"id\",\n isPrimary: true,\n isNullable: false,\n type: driver.normalizeType({type: driver.mappedDataTypes.cacheId}),\n generationStrategy: \"increment\",\n isGenerated: true\n },\n {\n name: \"identifier\",\n type: driver.normalizeType({type: driver.mappedDataTypes.cacheIdentifier}),\n isNullable: true\n },\n {\n name: \"time\",\n type: driver.normalizeType({type: driver.mappedDataTypes.cacheTime}),\n isPrimary: false,\n isNullable: false\n },\n {\n name: \"duration\",\n type: driver.normalizeType({type: driver.mappedDataTypes.cacheDuration}),\n isPrimary: false,\n isNullable: false\n },\n {\n name: \"query\",\n type: driver.normalizeType({type: driver.mappedDataTypes.cacheQuery}),\n isPrimary: false,\n isNullable: false\n },\n {\n name: \"result\",\n type: driver.normalizeType({type: driver.mappedDataTypes.cacheResult}),\n isNullable: false\n },\n ]\n },\n ));\n }\n\n /**\n * Caches given query result.\n * Returns cache result if found.\n * Returns undefined if result is not cached.\n */\n getFromCache(options: QueryResultCacheOptions, queryRunner?: QueryRunner): Promise<QueryResultCacheOptions|undefined> {\n queryRunner = this.getQueryRunner(queryRunner);\n const qb = this.connection\n .createQueryBuilder(queryRunner)\n .select()\n .from(this.queryResultCacheTable, \"cache\");\n\n if (options.identifier) {\n return qb\n .where(`${qb.escape(\"cache\")}.${qb.escape(\"identifier\")} = :identifier`)\n .setParameters({ identifier: this.connection.driver instanceof SqlServerDriver ? new MssqlParameter(options.identifier, \"nvarchar\") : options.identifier })\n .getRawOne();\n\n } else if (options.query) {\n if (this.connection.driver instanceof OracleDriver) {\n return qb\n .where(`dbms_lob.compare(${qb.escape(\"cache\")}.${qb.escape(\"query\")}, :query) = 0`, { query: options.query })\n .getRawOne();\n }\n\n return qb\n .where(`${qb.escape(\"cache\")}.${qb.escape(\"query\")} = :query`)\n .setParameters({ query: this.connection.driver instanceof SqlServerDriver ? new MssqlParameter(options.query, \"nvarchar\") : options.query })\n .getRawOne();\n }\n\n return Promise.resolve(undefined);\n }\n\n /**\n * Checks if cache is expired or not.\n */\n isExpired(savedCache: QueryResultCacheOptions): boolean {\n const duration = typeof savedCache.duration === \"string\" ? parseInt(savedCache.duration) : savedCache.duration;\n return ((typeof savedCache.time === \"string\" ? parseInt(savedCache.time as any) : savedCache.time)! + duration) < new Date().getTime();\n }\n\n /**\n * Stores given query result in the cache.\n */\n async storeInCache(options: QueryResultCacheOptions, savedCache: QueryResultCacheOptions|undefined, queryRunner?: QueryRunner): Promise<void> {\n queryRunner = this.getQueryRunner(queryRunner);\n\n let insertedValues: ObjectLiteral = options;\n if (this.connection.driver instanceof SqlServerDriver) { // todo: bad abstraction, re-implement this part, probably better if we create an entity metadata for cache table\n insertedValues = {\n identifier: new MssqlParameter(options.identifier, \"nvarchar\"),\n time: new MssqlParameter(options.time, \"bigint\"),\n duration: new MssqlParameter(options.duration, \"int\"),\n query: new MssqlParameter(options.query, \"nvarchar\"),\n result: new MssqlParameter(options.result, \"nvarchar\"),\n };\n }\n\n if (savedCache && savedCache.identifier) { // if exist then update\n const qb = queryRunner.manager\n .createQueryBuilder()\n .update(this.queryResultCacheTable)\n .set(insertedValues);\n\n qb.where(`${qb.escape(\"identifier\")} = :condition`, { condition: insertedValues.identifier });\n await qb.execute();\n\n } else if (savedCache && savedCache.query) { // if exist then update\n const qb = queryRunner.manager\n .createQueryBuilder()\n .update(this.queryResultCacheTable)\n .set(insertedValues);\n\n if (this.connection.driver instanceof OracleDriver) {\n qb.where(`dbms_lob.compare(\"query\", :condition) = 0`, { condition: insertedValues.query });\n\n } else {\n qb.where(`${qb.escape(\"query\")} = :condition`, { condition: insertedValues.query });\n }\n\n await qb.execute();\n\n } else { // otherwise insert\n await queryRunner.manager\n .createQueryBuilder()\n .insert()\n .into(this.queryResultCacheTable)\n .values(insertedValues)\n .execute();\n }\n }\n\n /**\n * Clears everything stored in the cache.\n */\n async clear(queryRunner: QueryRunner): Promise<void> {\n return this.getQueryRunner(queryRunner).clearTable(this.queryResultCacheTable);\n }\n\n /**\n * Removes all cached results by given identifiers from cache.\n */\n async remove(identifiers: string[], queryRunner?: QueryRunner): Promise<void> {\n await Promise.all(identifiers.map(identifier => {\n const qb = this.getQueryRunner(queryRunner).manager.createQueryBuilder();\n return qb.delete()\n .from(this.queryResultCacheTable)\n .where(`${qb.escape(\"identifier\")} = :identifier`, {identifier})\n .execute();\n }));\n }\n\n // -------------------------------------------------------------------------\n // Protected Methods\n // -------------------------------------------------------------------------\n\n /**\n * Gets a query runner to work with.\n */\n protected getQueryRunner(queryRunner: QueryRunner|undefined): QueryRunner {\n if (queryRunner)\n return queryRunner;\n\n return this.connection.createQueryRunner(\"master\");\n }\n\n}\n"],"sourceRoot":".."}
|
