【uniapp】uniapp中本地存储sqlite数据库保姆级使用教程（附完整代码和注释）

数据库请求接口封装

uniapp中提供了plus.sqlite接口，在这里我们对常用的数据库请求操作进行了二次封装
这里的dbName、dbPath、recordsTable 可以根据你的需求自己命名

module.exports = {/** * @type {String} 数据库名称*/dbName: 'salary',/*** 数据库地址* @type {String} 推荐以下划线为开头   _doc/xxx.db* @description 开发环境中数据库所在地址：文件管理/Android/data/io.dcloud.HBuilder/downloads/salary.db* @description 打包安装后数据库所在地址：文件管理/Android/data/uni.UNI4312312(以UNI开头接数字)/downloads/salary.db*/dbPath: '_downloads/salary.db',/*** 加班记录表名* @description* "time" DATE  PRIMARY KEY,"money" INTEGER,"notes" text,"info" text*/recordsTable: 'records',/*** 判断数据库是否打开* @returns {Boolean} 打开为 true，未打开为 false*/isOpen() {var open = plus.sqlite.isOpenDatabase({name: this.dbName,path: this.dbPath})return open;},/*** 打开数据库，没有则创建*/openSqlite() {return new Promise((resolve, reject) => {plus.sqlite.openDatabase({name: this.dbName,path: this.dbPath,success(e) {resolve(e);},fail(e) {reject(e);}})})},/*** 关闭数据库*/closeSqlite() {return new Promise((resolve, reject) => {plus.sqlite.closeDatabase({name: this.dbName,success(e) {resolve(e);},fail(e) {reject(e);}})})},/*** 数据库建表 sql:'CREATE TABLE IF NOT EXISTS dbTable("id" varchar(50),"name" TEXT) * 创建 CREATE TABLE IF NOT EXISTS 、 dbTable 是表名，不能用数字开头、括号里是表格的表头* @param {Object} dbTable 表名* @param {Object} data 表列* @example 创建表 DB.createTable(表名, 表的列)* let sql = '"date" DATE  PRIMARY KEY,"money" INTEGER,"notes" text,"info" text';* await DB.createTable('records', sql);*/createTable(dbTable, data) {return new Promise((resolve, reject) => {// executeSql: 执行增删改等操作的SQL语句plus.sqlite.executeSql({name: this.dbName,sql: `CREATE TABLE IF NOT EXISTS ${dbTable}(${data})`,success(e) {resolve(e);},fail(e) {reject(e);}})})},/*** 数据库删表* @param {Object} dbTable 表名* @description 数据库删表 sql:'DROP TABLE dbTable'*/dropTable(dbTable) {return new Promise((resolve, reject) => {plus.sqlite.executeSql({name: this.dbName,sql: `DROP TABLE ${dbTable}`,success(e) {resolve(e);},fail(e) {reject(e);}})})},// 向表格里添加数据 sql:'INSERT INTO dbTable VALUES('x','x','x')'			对应新增// 或者 sql:'INSERT INTO dbTable ('x','x','x') VALUES('x','x','x')'	具体新增/*** 向表格里添加数据* @param {String} dbTable 表名* @param {String} data 列值* @param {String} condition 表头列名* @example  * let sql = `'${item.money}','${item.notes}','${item.time}'`;* let condition = "'money','notes','time'";* await DB.insertTableData("records", sql, condition);*/insertTableData(dbTable, data, condition) {// 判断有没有传参if (dbTable !== undefined && data !== undefined) {// 判断传的参是否有值var bol = (JSON.stringify(data) == "{}");if (!bol) {if (condition == undefined) {var sql = `INSERT INTO ${dbTable} VALUES('${data}')`;} else {var sql = `INSERT INTO ${dbTable} (${condition}) VALUES(${data})`;}// console.log(sql);return new Promise((resolve, reject) => {// 表格添加数据plus.sqlite.executeSql({name: this.dbName,sql: sql,success(e) {resolve(e);},fail(e) {reject(e);}})})} else {return new Promise((resolve, reject) => {reject("错误添加")})}} else {return new Promise((resolve, reject) => {reject("错误添加")})}},/*** 根据条件向表格里添加数据  有数据更新、无数据插入* (建表时需要设置主键) 例如 --- "roomid" varchar(50) PRIMARY KEY* @param {String} dbTable 表名* @param {String} data 列值* @param {String} condition 表头列名* @example  * let sql = `'${item.money}','${item.notes}','${item.time}'`;* let condition = "'money','notes','time'";* await DB.insertTableData("records", sql, condition);*/insertOrReplaceData(dbTable, data, condition) {// 判断有没有传参if (dbTable !== undefined && data !== undefined) {if (condition == undefined) {var sql = `INSERT OR REPLACE INTO ${dbTable} VALUES('${data}')`;} else {var sql = `INSERT OR REPLACE INTO ${dbTable} (${condition}) VALUES(${data})`;}// console.log(sql);return new Promise((resolve, reject) => {// 表格添加数据plus.sqlite.executeSql({name: this.dbName,sql: sql,success(e) {resolve(e);},fail(e) {reject(e);}})})} else {return new Promise((resolve, reject) => {reject("错误添加")})}},/*** 查询获取数据库里的数据 sql:'SELECT * FROM dbTable WHERE lname = 'lvalue''* @param {String} dbTable 表名* @param {String} [condition = ''] 查找条件* @example* const searchCondition = `WHERE date = '${day}'`* await DB.selectTableData('表名', searchCondition);*/selectTableData(dbTable, condition = '') {if (dbTable !== undefined) {var sql = `SELECT * FROM ${dbTable} ${condition}`;return new Promise((resolve, reject) => {// 表格查询数据  执行查询的SQL语句plus.sqlite.selectSql({name: this.dbName,sql: sql,success(e) {resolve(e);},fail(e) {reject(e);}})})} else {return new Promise((resolve, reject) => {reject("错误查询")});}},/*** 删除表里的数据 sql:'DELETE FROM dbTable WHERE lname = 'lvalue''* @param {String} dbTable 表名* @param {String} [condition = ''] 查找条件* @example* const searchCondition = `WHERE date = '${day}'`* await DB.deleteTableData('表名', searchCondition);*/deleteTableData(dbTable, condition = '') {if (dbTable !== undefined) {var sql = `DELETE FROM ${dbTable} ${condition}`;return new Promise((resolve, reject) => {// 删除表数据plus.sqlite.executeSql({name: this.dbName,sql: sql,success(e) {resolve(e);},fail(e) {reject(e);}})})} else {return new Promise((resolve, reject) => {reject("错误删除")});}},// 修改数据表里的数据 sql:"UPDATE dbTable SET 列名 = '列值',列名 = '列值' WHERE lname = 'lvalue'"// 修改 UPDATE 、 dbTable 是表名, data: 要修改的列名=修改后列值, lname,lvalue 是查询条件的列名和列值updateTableData(dbTable, data, lname, lvalue) {if (lname == undefined) {var sql = `UPDATE ${dbTable} SET ${data}`;} else {var sql = `UPDATE ${dbTable} SET ${data} WHERE ${lname} = '${lvalue}'`;}// WHERE 前面是要修改的列名、列值，后面是条件的列名、列值return new Promise((resolve, reject) => {// 修改表数据plus.sqlite.executeSql({name: this.dbName,sql: sql,success(e) {resolve(e);},fail(e) {reject(e);}})})},// 获取指定数据条数  sql:"SELECT * FROM dbTable ORDER BY 'id' DESC LIMIT 15 OFFSET 'num'"// dbTable 表名, ORDER BY 代表排序默认正序, id 是排序的条件 DESC 代表倒序，从最后一条数据开始拿// LIMIT 15 OFFSET '${num}',这句的意思是跳过 num 条拿 15 条数据, num 为跳过多少条数据是动态值// 例 初始num设为0，就从最后的数据开始拿15条，下次不拿刚获取的数据，所以可以让num为15，这样就能一步一步的拿完所有的数据pullSQL(dbTable, id, num) {return new Promise((resolve, reject) => {plus.sqlite.selectSql({name: this.dbName,sql: `SELECT * FROM ${dbTable} ORDER BY '${id}' DESC LIMIT 15 OFFSET '${num}'`,success(e) {resolve(e);},fail(e) {reject(e);}})})}
}

使用案例

这里给了几个简单的案例，一通百通

import DB from "@/api/sqlite";/**添加或者更新加班费，主键是日期* @param {Object} submitParam 单个日期的加班信息* @param {Number} submitParam.money 加班费* @param {String} submitParam.notes 备注* @param {Date} submitParam.date 加班日期* @param {String} submitParam.info 日历日期下面显示内容*/
async function recordSalary(submitParam) {try {// 新增 DB.insertTableData(表名, 对应表头列的数据)let sql = `${submitParam.money},'${submitParam.notes}','${submitParam.date}','${submitParam.info}'`;let condition = "'money','notes','date','info'";await DB.insertOrReplaceData(DB.recordsTable, sql, condition);return '添加/更新加班费成功';} catch (e) {throw e;}
}/**通过年月查询加班费记录* @param {String} month 日期* @example queryRecordsByMonth('2023-12')*/
async function queryRecordsByMonth(month) {try {const searchCondition = `WHERE strftime('%Y-%m', date) = '${month}'`const records = await DB.selectTableData(DB.recordsTable, searchCondition);return records;} catch (e) {throw e;}
}/**通过具体日期查询加班费记录* @param {String} day 日期* @example queryRecordsByMonth('2023-12-20')*/
async function queryRecordsByDay(day) {try {const searchCondition = `WHERE date = '${day}'`const records = await DB.selectTableData(DB.recordsTable, searchCondition);return records;} catch (e) {throw e;}
}/**通过具体日期删除该天的加班记录* @param {Object} day 日期* @example deleteRecordByDate('2023-12-20')*/
async function deleteRecordByDate(day) {try {const searchCondition = `WHERE date = '${day}'`const result = await DB.deleteTableData(DB.recordsTable, searchCondition);return '删除记录成功';} catch (e) {throw e;}
}export default {recordSalary,queryRecordsByMonth,queryRecordsByDay,deleteRecordByDate
}