#鸿蒙通关秘籍#如何使用ArkTS的TaskPool进行高效的数据库操作？

HarmonyOS

CTP晨露微光

2024-12-09 15:42:58

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在鸿蒙开发中，为了提高数据库操作的效率，可以使用ArkTS提供的TaskPool将数据库操作放在后台线程中，从而避免阻塞主线程。步骤如下：

定义并创建数据库： typescript @Concurrent async function create(context: Context) { const CONFIG: relationalStore.StoreConfig = { name: "Store.db", securityLevel: relationalStore.SecurityLevel.S1, }; let store: relationalStore.RdbStore = await relationalStore.getRdbStore(context, CONFIG); const CREATE_TABLE_SQL = "CREATE TABLE IF NOT EXISTS test (" + "id INTEGER PRIMARY KEY AUTOINCREMENT, " + "name TEXT NOT NULL, " + "age INTEGER, " + "salary REAL, " + "blobType BLOB)"; await store.executeSql(CREATE_TABLE_SQL); }
插入数据至数据库： typescript @Concurrent async function insert(context: Context, valueBucketArray: Array<relationalStore.ValuesBucket>) { const CONFIG: relationalStore.StoreConfig = { name: "Store.db", securityLevel: relationalStore.SecurityLevel.S1, }; let store: relationalStore.RdbStore = await relationalStore.getRdbStore(context, CONFIG); await store.batchInsert("test", valueBucketArray as Object as Array<relationalStore.ValuesBucket>); }
数据的查询操作： typescript @Concurrent async function query(context: Context): Promise<Array<relationalStore.ValuesBucket>> { const CONFIG: relationalStore.StoreConfig = { name: "Store.db", securityLevel: relationalStore.SecurityLevel.S1, }; let store: relationalStore.RdbStore = await relationalStore.getRdbStore(context, CONFIG); let predicates: relationalStore.RdbPredicates = new relationalStore.RdbPredicates("test"); let resultSet = await store.query(predicates); // 查询所有数据 let result = new Array<relationalStore.ValuesBucket>(resultSet.rowCount) let index = 0; while (resultSet.goToNextRow()) { result[index++] = resultSet.getRow(); } resultSet.close(); return result; }
清除数据库数据： typescript @Concurrent async function clear(context: Context) { const CONFIG: relationalStore.StoreConfig = { name: "Store.db", securityLevel: relationalStore.SecurityLevel.S1, }; await relationalStore.deleteRdbStore(context, CONFIG); }

在使用TaskPool配合后台线程执行数据库操作时，能够显著提高应用的流畅度和响应速度。