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Nodejs better-sqlite3基本操作

作者:互联网

Nodejs平台上操纵sqlite数据库的工具,语法简洁,运行效率高。
详细教程地址

安装

在工程中添加:

yarn add better-sqlite3

对象类

better-sqlite3中的对象有两类,一个是Database类,一个是Statement类,Database对象可以实现数据库的连接和基本操作,Database.prepare()用于生成Statement对象,Statement对象是对SQL语句的封装,方便执行固定的语句。

初步使用

新建一个数据库对象:

const Database=require("better-sqlite3")
const db=new Database('../database.db',{verbose:console.log})

新建一个查询语句对象:

const stmt=db.prepare('SELECT * FROM users ');

使用查询:

var row=stmt.all()//返回全部记录
//var row=stmt.get()//返回第一条记录
console.log(row)

带参数查询:

const get_user_by_id=db.prepare('SELECT * FROM articles WHERE id = ?');//一个查询语句对象
var a=get_user_by_id.get(4)//执行查询
console.log(a)

执行SQL语句

直接执行SQL语句:

创建表:

const create_table_cats=
    `CREATE TABLE cats
     (
         id      INT   PRIMARY KEY  NOT NULL,
         name    CHAR(50)           NOT NULL,
         age   INT
     );`

db.exec(create_table_cats)//执行命令

//db.exec(`DROP TABLE cats`)//删除表

增删改查

插入一条记录:

//创建插入语句
const insert = db.prepare('INSERT INTO cats (id,name, age) VALUES (@id,@name, @age)');

//插入一条记录
insert.run({id:0,name:'Jack',age:2})

//创建批量插入语句
const insertMany = db.transaction((cats) => {
    for (const cat of cats) insert.run(cat);
});

//执行批量插入语句
insertMany([
    {id:2,  name: 'Joey', age: 2 },
    {id:3,  name: 'Sally', age: 4 },
    {id:4, name: 'Junior', age: 1 },
]);

查询记录:

const select_stmt=db.prepare('SELECT * FROM cats')
var cats=select_stmt.all()
console.log(cats)

更新记录:

const updata_stmt = db.prepare('UPDATE cats SET name =@name ,age=@age WHERE id=@id')
updata_stmt.run({id:1,name:"Tom",age:3})

删除记录:

const delete_stmt=db.prepare('DELETE FROM cats WHERE id = @id;')
delete_stmt.run({id:3})

全部实验代码

const Database=require("better-sqlite3")
const db=new Database('temp.sqlite',{verbose:console.log})
/*
const create_table_cats=
    `CREATE TABLE cats
     (
         id      INT   PRIMARY KEY  NOT NULL,
         name    CHAR(50)           NOT NULL,
         age   INT
     );`

db.exec(create_table_cats)

db.exec(`DROP TABLE cats`)

 */


//创建插入语句

const insert = db.prepare('INSERT INTO cats (id,name, age) VALUES (@id,@name, @age)');
insert.run({id:1,name:'Jack',age:2})

//创建循环插入语句
const insertMany = db.transaction((cats) => {
    for (const cat of cats) insert.run(cat);
});

insertMany([
    {id:2,  name: 'Joey', age: 2 },
    {id:3,  name: 'Sally', age: 4 },
    {id:4, name: 'Junior', age: 1 },
]);


//查询语句
const select_stmt=db.prepare('SELECT * FROM cats')
var cats=select_stmt.all()
console.log(cats)

//更改数据
const updata_stmt = db.prepare('UPDATE cats SET name =@name ,age=@age WHERE id=@id')
updata_stmt.run({id:1,name:"Tom",age:3})

//删除数据
const delete_stmt=db.prepare('DELETE FROM cats WHERE id = @id;')
delete_stmt.run({id:3})



标签:const,name,age,db,better,cats,sqlite3,基本操作,id
来源: https://blog.csdn.net/ashtyukjhf/article/details/122538282