* 使用sqlite3持久化數據
* 需求:把一個數組中的每個對象,每個對象中的屬性,存到xxx.db文件中去,像數據庫一樣的去操作它
* 功能:1. 創建數據庫(數據庫存在的話,那就直接打開)
* 2. 創建一個表(表存在的話就不用創建啦)
* 3. 有了數據庫和表, 最最基礎的功能就是:
* 插入數據(單個數據插入或者多個並行插入)
* 更新數據(根據不同的條件更新每列數據)
* 刪除數據(根據不同的條件來刪除每列數據)
* 查詢數據(單個數據查詢,多個數據查詢)
安裝:
npm install sqlite3
/** * Created by Sorrow.X on 2017/7/12. */ var SQLite3 = require('sqlite3').verbose(); /** * 使用sqlite3持久化數據 * 需求:把一個數組中的每個對象,每個對象中的屬性,存到xxx.db文件中去,像數據庫一樣的去操作它 * 功能:1. 創建數據庫(數據庫存在的話,那就直接打開) * 2. 創建一個表(表存在的話就不用創建啦) * 3. 有了數據庫和表, 最最基礎的功能就是: * 插入數據(單個數據插入或者多個並行插入) * 更新數據(根據不同的條件更新每列數據) * 刪除數據(根據不同的條件來刪除每列數據) * 查詢數據(單個數據查詢,多個數據查詢) */ class HandleDB { constructor(options) { this.databaseFile = options && options.databaseFile || `./data/test.db`; // 數據庫文件(文件路徑+文件名) this.tableName = options && options.tableName || `adsTable`; // 表名 this.db = null; // 打開的數據庫對象 } // 連接數據庫(不存在就創建,存在則打開) connectDataBase() { let _self = this; return new Promise((resolve, reject) => { _self.db = new SQLite3.Database(_self.databaseFile, function(err) { if (err) reject(new Error(err)); resolve('數據庫連接成功'); }); }); } /** * 創建表 * @param sentence CREATE TABLE 語句 * @used let sentence = ` create table if not exists ${this.tableName}( begin_time varchar(255), create_time varchar(255), end_time varchar(255), play_id varchar(255), postion_id int(50), status int(50), task_id int(50) );`; this.createTable(sentence); */ createTable(sentence) { let _self = this; return new Promise((resolve, reject) => { _self.db.exec(sentence, function(err) { if (err) reject(new Error(err)); resolve(`表創建成功 / 已存在,不需要重新創建該表`); }); }); } /** * 執行 增 刪 改 查(單個數據查詢或者多個數據查詢) * @param sql sql語句 * @param param 參數(可以是數組或者數字或者字符串,根據sql語句來定) * @param mode 執行模式, 默認run,執行sql,如果查詢的話,則使用get(單個)all(多個) * @returns {Promise} @used 增 : this.sql(`insert into ${this.tableName} (begin_time, create_time, end_time, play_id, postion_id, status, task_id) values(?, ?, ?, ?, ?, ?, ?)`, [obj.begin_time, obj.create_time, obj.end_time, obj.play_id, obj.postion_id, obj.status, obj.task_id]); 刪 : this.sql(`delete from ${this.tableName} where id = ?`, id); 改 : this.sql(`update ${this.tableName} set begin_time = ?, status = ? where postion_id = ?`, [begin_timeValue, statusValue, postion_idValue]); 查 : this.sql(`select * from ${this.tableName} where id = ?`, id, 'get/all'); */ sql(sql, param, mode) { let _self = this; mode = mode == 'all' ? 'all' : mode == 'get' ? 'get' : 'run'; return new Promise((resolve, reject) => { _self.db[mode](sql, param, function (err, data) { // data: Array, Object if (err) { reject(new Error(err)); } else { if (data) { resolve(data); // 返回數據查詢成功的結果 } else { resolve('success'); // 提示 增 刪 改 操作成功 }; }; } ); }); } }; module.exports = HandleDB;
// 使用
// used: let db = new HandleDB({ databaseFile: './data/adsbase.db', tableName: 'ads' }); db.connectDataBase().then((result)=>{ console.log(result); // 創建表(如果不存在的話,則創建,存在的話, 不會創建的,但是還是會執行回調) let sentence = ` create table if not exists ${db.tableName}( begin_time varchar(255), create_time varchar(255), end_time varchar(255), play_id varchar(255), postion_id int(50), status int(50), task_id int(50), same_day int(50) );`; return db.createTable(sentence); }).then((result)=>{ console.log(result); doLogic(); }).catch((err)=>{ console.error(err); }); let doLogic = function() { // 增 db.sql(`insert into ${db.tableName} (begin_time, create_time, end_time, play_id, postion_id, status, task_id, same_day) values(?, ?, ?, ?, ?, ?, ?, ?)`, ['2017/7/12', '2017/7/12', '2017/7/12', 102, 3, 0, 11, '2017-7-12']).then((res)=>{ console.log(res); }).catch((err)=>{ console.log(err); }); // 一次性插入多個數據 var data = { "Body": [ { "begin_time": "1970-01-01 00:00:00", "create_time": "2017-07-11", "end_time": "", "play_id": 17, "postion_id": 1, "status": 0, "task_id": 24 }, { "begin_time": "1970-01-01 00:00:00", "create_time": "2017-07-11", "end_time": "", "play_id": 18, "postion_id": 4, "status": 0, "task_id": 24 }, { "begin_time": "1970-01-01 00:00:00", "create_time": "2017-07-11", "end_time": "", "play_id": 19, "postion_id": 2, "status": 0, "task_id": 24 }, { "begin_time": "1970-01-01 00:00:00", "create_time": "2017-07-11", "end_time": "", "play_id": 20, "postion_id": 3, "status": 0, "task_id": 24 } ], "Code": 0, "Message": "" }; var arr = data.Body; var promises = arr.map(function(obj) { return db.sql(`insert into ${db.tableName} (begin_time, create_time, end_time, play_id, postion_id, status, task_id, same_day) values(?, ?, ?, ?, ?, ?, ?, ?)`, [obj.begin_time, obj.create_time, obj.end_time, obj.play_id, obj.postion_id, obj.status, obj.task_id, '2017-7-12']); }); Promise.all(promises).then(function (posts) { console.log('全部插入完畢', posts) }).catch(function(reason){ console.error(reason); }); // 刪 db.sql(`delete from ${db.tableName} where same_day = ?`, '2017-7-12').then((res)=>{ console.log(res); }).catch((err)=>{ console.log(err); }); // 改 db.sql(`update ${db.tableName} set task_id = ? where same_day = ?`, [4, '2017-7-12']).then((res)=>{ console.log(res); }).catch((err)=>{ console.log(err); }); // 查 db.sql(`select * from ${db.tableName} where same_day = ?`, '2017-7-12', 'all').then((res)=>{ console.log(res); }).catch((err)=>{ console.log(err); }); };
文檔: https://github.com/mapbox/node-sqlite3/wiki/API
sql工具下載: http://www.sqliteexpert.com/