本篇包括(条件查询、AND 、OR 、NOT 、排序和分页、批量操作等)
1. 查询
查询全部
模型.findAll(findOptions: Object)
在数据库中搜索多个记录，返回数据和总计数
findOptions.where：搜索条件
findOptions.limit：记录条数限制
findOptions.offset：记录偏移
findOptions.order：记录排序方式
Sequelize 的 where 配置项完美支持了 SQL 的 where 子句的功能
const users = await UsersModel.findAll({
attributes: ['id', 'username', 'password'],
where: {
id: [4,5],
username: 'John'
}
});
// 找到之后更改一下它的password 因为findAll 返回的是一个数组
users[0].password = '111111111111111111'
users[0].save();
// 最后得到的users只有一条符合条件
键值对被转换成了 key = value 的形式，若一个对象包含多个键值对会被转换成了 AND 条件，即：k1: v1, k2: v2 转换为 k1 = v1 AND k2 = v2
2. AND 条件
const Op = Sequelize.Op;
const users = await UsersModel.findAll({
attributes: ['id', 'username', 'password'],
where: {
[Op.and]: [
{id: [4,5]},
{username: 'John'}
]
}
});
users[0].password = '105555555'
users[0].save();
console.log(users);
3. OR 条件
const Op = Sequelize.Op;
const users = await UsersModel.findAll({
attributes: ['id', 'username', 'password'],
where: {
[Op.or]: [
{id: [4,5]},
{username: 'John'}
]
}
});
users[0].password = '105555555'
users[0].save();
console.log(users);
4. not 条件
const Op = Sequelize.Op;
const users = await UsersModel.findAll({
attributes: ['id', 'username', 'password'],
where: {
[Op.not]: [
{id: [4,5]}
]
}
});
5. 其他条件 (如果你懂数据库语言下边代码看起来不难)
const { Op } = require("sequelize");
Post.findAll({
where: {
[Op.and]: [{ a: 5 }, { b: 6 }], // (a = 5) AND (b = 6)
[Op.or]: [{ a: 5 }, { b: 6 }], // (a = 5) OR (b = 6)
someAttribute: {
// Basics
[Op.eq]: 3, // = 3
[Op.ne]: 20, // != 20
[Op.is]: null, // IS NULL
[Op.not]: true, // IS NOT TRUE
[Op.or]: [5, 6], // (someAttribute = 5) OR (someAttribute = 6)
// Using dialect specific column identifiers (PG in the following example):
[Op.col]: 'user.organization_id', // = "user"."organization_id"
// Number comparisons
[Op.gt]: 6, // > 6
[Op.gte]: 6, // >= 6
[Op.lt]: 10, // < 10
[Op.lte]: 10, // <= 10
[Op.between]: [6, 10], // BETWEEN 6 AND 10
[Op.notBetween]: [11, 15], // NOT BETWEEN 11 AND 15
// Other operators
[Op.all]: sequelize.literal('SELECT 1'), // > ALL (SELECT 1)
[Op.in]: [1, 2], // IN [1, 2]
[Op.notIn]: [1, 2], // NOT IN [1, 2]
[Op.like]: '%hat', // LIKE '%hat'
[Op.notLike]: '%hat', // NOT LIKE '%hat'
[Op.startsWith]: 'hat', // LIKE 'hat%'
[Op.endsWith]: 'hat', // LIKE '%hat'
[Op.substring]: 'hat', // LIKE '%hat%'
[Op.iLike]: '%hat', // ILIKE '%hat' (case insensitive) (PG only)
[Op.notILike]: '%hat', // NOT ILIKE '%hat' (PG only)
[Op.regexp]: '^[h|a|t]', // REGEXP/~ '^[h|a|t]' (MySQL/PG only)
[Op.notRegexp]: '^[h|a|t]', // NOT REGEXP/!~ '^[h|a|t]' (MySQL/PG only)
[Op.iRegexp]: '^[h|a|t]', // ~* '^[h|a|t]' (PG only)
[Op.notIRegexp]: '^[h|a|t]', // !~* '^[h|a|t]' (PG only)
[Op.any]: [2, 3], // ANY ARRAY[2, 3]::INTEGER (PG only)
// In Postgres, Op.like/Op.iLike/Op.notLike can be combined to Op.any:
[Op.like]: { [Op.any]: ['cat', 'hat'] } // LIKE ANY ARRAY['cat', 'hat']
// There are more postgres-only range operators, see below
}
}
});
6. 嵌套条件(一看代码就懂)
const { Op } = require("sequelize");
Foo.findAll({
where: {
rank: {
[Op.or]: {
[Op.lt]: 1000,
[Op.eq]: null
}
},
// rank < 1000 OR rank IS NULL
{
createdAt: {
[Op.lt]: new Date(),
[Op.gt]: new Date(new Date() - 24 * 60 * 60 * 1000)
}
},
// createdAt < [timestamp] AND createdAt > [timestamp]
{
[Op.or]: [
{
title: {
[Op.like]: 'Boat%'
}
},
{
description: {
[Op.like]: '%boat%'
}
}
]
}
// title LIKE 'Boat%' OR description LIKE '%boat%'
}
});
第二个例子
Project.findAll({
where: {
name: 'Some Project',
[Op.not]: [
{ id: [1,2,3] },
{
description: {
[Op.like]: 'Hello%'
}
}
]
}
});
相当于下边这个sql语句
SELECT *
FROM `Projects`
WHERE (
`Projects`.`name` = 'some project'
AND NOT (
`Projects`.`id` IN (1,2,3)
OR
`Projects`.`description` LIKE 'Hello%'
)
)
7. 搜索单条记录
findOne 方法
const Op = Sequelize.Op;
const user = await UsersModel.findOne({
where: {
username: 'zhangsan'
}
})
console.log(user);
console.log(user.id);
8. 获取数据总数
findAndCountAll 方法
const result = await UsersModel.findAndCountAll();
console.log(result.count);
9. 排序
const users = await UsersModel.findAll({
attributes: ['id', 'username', 'password'],
order: [
['id', 'DESC'] // 逆序
// ['id'] 正序
]
})
console.log(users[0].username);
10. 分页
let countPerPage = 2, currentPage = 1;
const users = await UsersModel.findAll({
attributes: ['id', 'username', 'password'],
order: [
['id', 'DESC']
],
limit: countPerPage, // 每页多少条
offset: countPerPage * (currentPage - 1) // 跳过多少条
})
console.log(users);
11. 批量插入
const userCreat = await UsersModel.bulkCreate([
{username: 'lisi1', password: '9991'},
{username: 'lisi2', password: '9992'},
{username: 'lisi3', password: '9993'},
{username: 'lisi4', password: '9994'},
{username: 'lisi5', password: '9995'},
])
12. 更新指定
const Op = Sequelize.Op;
const affectedRows = await UsersModel.update(
{ username: "King" },
{
where: {
password: '9991'
}
}
);
13.删除指定
const affectedRows = await UsersModel.destroy(
{
where: {
password: '9991'
}
}
);
关于统计，关联查询与预加载，外键等等有时间再补上吧
14. 测试的全部代码
(async function() {
const Sequelize = require('sequelize');
const sequelize = new Sequelize('list', 'root', '123456', {
host: 'localhost',
dialect: 'mysql'
});
const UsersModel = await sequelize.define('Users', {
id: {
allowNull: false,
autoIncrement: true,
primaryKey: true,
type: Sequelize.INTEGER
},
username: {
type: Sequelize.STRING(20),
allowNull: false
},
password: {
type: Sequelize.CHAR(32),
allowNull: false
},
createdAt: {
allowNull: false,
type: Sequelize.DATE
},
updatedAt: {
allowNull: false,
type: Sequelize.DATE
}
}, {
tableName: 'users'
});
// 单查
// const Op = Sequelize.Op;
// const user = await UsersModel.findOne({
// where: {
// username: 'zhangsan'
// }
// })
// console.log(user.id);
// 总条数
// const Op = Sequelize.Op;
// const result = await UsersModel.findAndCountAll();
// console.log(result.count);
// 分页
// let countPerPage = 2, currentPage = 1;
// const users = await UsersModel.findAll({
// attributes: ['id', 'username', 'password'],
// order: [
// ['id', 'DESC']
// ],
// limit: countPerPage, // 每页多少条
// offset: countPerPage * (currentPage - 1) // 跳过多少条
// })
// console.log(users);
// 批量增
// const userCreat = await UsersModel.bulkCreate([
// {username: 'lisi1', password: '9991'},
// {username: 'lisi2', password: '9992'},
// {username: 'lisi3', password: '9993'},
// {username: 'lisi4', password: '9994'},
// {username: 'lisi5', password: '9995'},
// ])
// 更新某条
// const Op = Sequelize.Op;
// const affectedRows = await UsersModel.update(
// { username: "King" },
// {
// where: {
// password: '9991'
// }
// }
// );
// 删除指定
// const Op = Sequelize.Op;
// const affectedRows = await UsersModel.destroy({
// where: {
// password: '9991'
// }
// });
// 条件查询
// const users = await UsersModel.findAll({
// attributes: ['id', 'username', 'password'],
// where: {
// id: [4,5],
// username: 'John'
// }
// });
// users[0].password = '999999999'
// users[0].save();
// const Op = Sequelize.Op;
// const users = await UsersModel.findAll({
// attributes: ['id', 'username', 'password'],
// where: {
// [Op.or]: [
// {id: [4,5]},
// {username: 'John'}
// ]
// }
// });
// users[0].password = '105555555'
// users[0].save();
// console.log(users);
// const Op = Sequelize.Op;
// const users = await UsersModel.findAll({
// attributes: ['id', 'username', 'password'],
// where: {
// [Op.not]: [
// {id: [4,5]}
// ]
// }
// });
// users[0].password = '105555555'
// users[0].save();
// console.log(users);
// const users = await UsersModel.findAndCountAll();
// console.log(users.rows);
})()
未完待续。。。
