I'm using SQL Server, I'm not experienced in T-SQL, but I want to generate random value including letters and numbers for one column for my project:
CREATE TABLE [dbo].[Orders]
(
[Id] INT NOT NULL,
[UserId] INT NOT NULL,
[MedicineId] INT NOT NULL,
[CourierId] INT NULL,
[ReadyForDelivery] BIT NOT NULL,
[OrderNumber] NVARCHAR(11) NOT NULL,
CONSTRAINT [PK_Orders] PRIMARY KEY CLUSTERED ([Id] ASC)
);
Id is my primary key also I want to put a random number and letters in the OrderNumber column. How can I do that?
I use migration when I'm creating this table
protected override void Up(MigrationBuilder migrationBuilder)
{
migrationBuilder.CreateTable(
name: "Orders",
columns: table => new
{
Id = table.Column<int>(type: "int", nullable: false)
.Annotation("SqlServer:Identity", "1, 1"),
UserId = table.Column<int>(type: "int", nullable: false),
MedicineId = table.Column<int>(type: "int", nullable: false),
CourierId = table.Column<int>(type: "int", nullable: false),
ReadyForDelivery = table.Column<bool>(type: "bit", nullable: false),
OrderNumber = table.Column<string>(type: "nvarchar(max)", nullable: false)
},
constraints: table =>
{
table.PrimaryKey("PK_Orders", x => x.Id);
});
}
I'm trying to define a model with a composite key made up of the created_by and user_id fields, where the user_id is also a foreign key in the user table.
I'm following the example for composite keys from the Sequelize docs, where you have to set primaryKey to true on each of the fields which make up the composite key.
However, this isn't working - the result is that the created_by becomes the PK and user_id is a FK for the user table. When I try to insert a new record with the same created_by value, but a different user_id this doesn't work.
class my_model extends Model = (sequelize, Sequelize) => {
my_model.init({
'some_val': { type: Sequelize.DOUBLE, defaultValue: 0},
'some_val2': { type: Sequelize.DOUBLE, defaultValue: 0},
'created_by': { type: Sequelize.DATEONLY, allowNull: false, primaryKey: true},
'user_id': { type: Sequelize.INTEGER, allowNull: false, primaryKey: true, references: {model: 'user', key: 'id'}},
},
{
'indexes': [{unique: true, fields: ['user_id', 'created_by']}]
}
);
};
Json data
{ "Root":
[
{ "Column": "Primary_key", "CurrentValue": "3456", "NewValue": null },
{ "Column": "FirstName", "CurrentValue": "Jon", "NewValue": null },
{ "Column": "Phone", "CurrentValue": "null", "NewValue": "6789" }
]
}
My Json data is from a table as shown above. I need to check if the primary key and FirstName matches a row, then update the value of column Phone in target row.
How to achieve this in SQL?
Create a table with specifications:
CREATE TABLE json_table (
<your_field_unique>,
CONSTRAINT <unique_cond> CHECK (<your_field_unique> IS JSON WITH UNIQUE KEYS)
);
Into <> you can put your variables.
Regards.
I use PostgreSQL 10.11 and would want to enter the following structure into a jsonb field:
{
lead: {
name: string,
prep: boolean
},
secondary: {
{
name: string,
prep: boolean
},
{
name: string,
prep: boolean
}
}
so lead is an object with name and prep and secondary is an array of name and preps.
How can I do that? The scripts below is to create a table with jsonb field:
CREATE TABLE public.test01 (
name JSONB DEFAULT '{}'::jsonb NOT NULL
)
WITH (oids = false);
ALTER TABLE public.test01
ALTER COLUMN id SET STATISTICS 0;
COMMENT ON COLUMN public.test01.name
IS '''[]''';
ALTER TABLE public.test01
OWNER TO postgres;
I'm trying this insert but get error:
INSERT INTO
public.test01
(
name
)
VALUES
('
{"lead":
"name": "Paint house",
"prep": "yes"}
,
"Secondary":
"name": "John",
"prep", "No"}
}
');
It's the first time I'm using jsonb so a select example would also be helpful to know hoe to read the data as well.
Your JSON is malformed. Presumably, you meant:
INSERT INTO public.test01 (name)
VALUES (
'{
"lead": {
"name": "Paint house",
"prep": "yes"
},
"Secondary": {
"name": "John",
"prep": "No"
}
}'::jsonb);
Demo on DB Fiddle
I have the following database setup for my status posts. For each post, users can like the post, comment on the post or can even be tagged in the original post by the author.
I'm trying to setup my Resourceful controller 'Post' to bring back all the data via JSON object but I can't properly find the comment, likes or tags usernames. I'm using Sentry 2 for auth if that makes a difference.
Here's the database setup:
CREATE TABLE Users (
id INT NOT NULL AUTO_INCREMENT,
first_name VARCHAR(30),
last_name VARCHAR(30),
many more...
);
CREATE TABLE Posts (
postID INT NOT NULL AUTO_INCREMENT,
caption VARCHAR(200),
description VARCHAR(200),
fromID INT(10) UNSIGNED NOT NULL,
toID INT(10) UNSIGNED NOT NULL,
icon VARCHAR(200),
link VARCHAR(200),
message TEXT,
storyType INT,
type ENUM ('LINK', 'PHOTO', 'STATUSUPDATE', 'VIDEO' ),
createdTime DATE,
PRIMARY KEY (postID),
FOREIGN KEY (fromID) REFERENCES users (id),
FOREIGN KEY (toID) REFERENCES users (id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
CREATE TABLE Likes (
likeID INT NOT NULL AUTO_INCREMENT,
fromID INT(10) UNSIGNED NOT NULL,
postID INT NOT NULL,
createdDate DATE,
PRIMARY KEY (likeID),
FOREIGN KEY (fromID) REFERENCES users (id),
FOREIGN KEY (postID) REFERENCES Posts (postID)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
CREATE TABLE Comments (
commentID INT NOT NULL AUTO_INCREMENT,
fromID INT(10) UNSIGNED NOT NULL,
postID INT NOT NULL,
comment TEXT,
createdDate DATE,
PRIMARY KEY (commentID),
FOREIGN KEY (fromID) REFERENCES users (id),
FOREIGN KEY (postID) REFERENCES Posts (postID)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
CREATE TABLE Tags (
tagID INT NOT NULL AUTO_INCREMENT,
userID INT(10) UNSIGNED NOT NULL,
postID INT NOT NULL,
PRIMARY KEY (tagID),
FOREIGN KEY (userID) REFERENCES users (id),
FOREIGN KEY (postID) REFERENCES Posts (postID)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
My Post Controller, I just have a simple page that spits out everything. I don't want to loop through anything in my view file, I just want to bring back the json full object.
class PostController extends BaseController {
public function show($id)
{
$post = Post::with(array('comments', 'from', 'tags', 'likes'))->find($id);
return View::make('samplepage')->with('data', $post);
}
}
My Post Model:
class Post extends Eloquent {
protected $table = 'Posts';
protected $primaryKey = 'postID';
public function comments()
{
return $this->hasMany('Comment','postID');
}
public function tags()
{
return $this->hasMany('Tag','postID');
}
public function likes()
{
return $this->hasMany('Like','postID');
}
public function from()
{
return $this->belongsTo('User', 'fromID')->select(array('id', 'first_name', 'last_name'));
}
public function users()
{
return $this->belongsTo('User', 'fromID');
}
}
Comment Model:
class Comment extends Eloquent {
protected $table = 'Comments';
protected $primaryKey = 'commentID';
public function post() {
return $this->belongsTo('Post','fromID');
}
public function user() {
return $this->belongsTo('User', 'fromID')->select(array('id', 'first_name', 'last_name'));
}
}
Tag Model:
class Tag extends Eloquent {
protected $table = 'Tags';
protected $primaryKey = 'tagID';
}
I even setup the following in my user model but it makes no difference.
User Model:
public function posts() {
return $this->hasMany('Post','id');
}
public function comments() {
return $this->hasMany('Comment','id');
}
Everything works great with this setup and when I hit posts/2 with this the following code, I get the below object back.
$post = Post::with(array('comments', 'from', 'tags', 'likes'))->find($id);
return View::make('samplepage')->with('data', $post);
{
postID: "2",
toID: "8",
comments: [
{
commentID: "2",
comment: "second comment",
fromID: "1",
postID: "2",
createdDate: "2014-02-15"
}
],
from: {
id: "4",
first_name: Paul,
last_name: Davis
},
tags: [
{
tagID: "1",
userID: "2",
postID: "2"
},
{
tagID: "2",
userID: "3",
postID: "2"
}
],
likes: [
{
likeID: "1",
fromID: "2",
postID: "2",
createdDate: "2013-01-04"
},
{
likeID: "2",
fromID: "3",
postID: "2",
createdDate: "2013-02-05"
}
]
}
But what I want is the following, where for each tag, like and comment to concatenate the first and last name and get them back with the object.
{
postID: "2",
toID: "4",
comments: [
{
commentID: "2",
comment: "second comment",
fromID: "1",
from: {
"name": "Jason Terry",
"id": "721286625"
},
postID: "2",
createdDate: "2014-02-15"
}
],
from: {
id: "4",
first_name: Paul,
last_name: Davis
},
tags: [
{
tagID: "1",
userID: "2",
from: {
"name": "David Lee",
"id": "721286625"
},
postID: "2"
},
{
tagID: "2",
userID: "3",
from: {
"name": "Paul Pierce",
"id": "721286625"
},
postID: "2"
}
],
likes: [
{
likeID: "1",
fromID: "2",
from: {
"name": "David Lee",
"id": "721286625"
},
postID: "2",
createdDate: "2013-01-04"
},
{
likeID: "2",
fromID: "3",
from: {
"name": "Al Davis",
"id": "721286625"
},
postID: "2",
createdDate: "2013-02-05"
}
]
}
I have searched Stackoverflow, countless Laravel blogs, the official documentation for 2 weeks now and I can't seem to solve this. Any help is wonderfully appreciate.
Update:
With Tony's answer below I added
$post = Post::with(array('comments.users', 'from', 'tags.users', 'likes.users'))->find($id);
Then I added
public function users()
{ return $this->belongsTo('User', 'fromID')->select(array('id', 'first_name', 'last_name'));
}
to the comments, tags, and likes model. And the object works great now.
But my debugger shows the following
select `id`, `first_name`, `last_name` from `users` where `users`.`id` in ('1')
select `id`, `first_name`, `last_name` from `users` where `users`.`id` in ('4')
select `id`, `first_name`, `last_name` from `users` where `users`.`id` in ('2', '3')
select `id`, `first_name`, `last_name` from `users` where `users`.`id` in ('2', '3')
In short, it runs 4 queries on my users table. Isn't this redundant? Shouldn't it be doing 1 query to the users table instead of 1 query for the original post user, 1 query for the comments users, 1 query for the tags users, and 1 query for the likes users?
It looks like you want to use nested relationships.
$post = Post::with('comments.from', 'from', 'tags.from', 'likes.from')->find($id);
You would also need the "from" relationship coded into each of those models.
To get your concatenated name; you'd need the following in your User model
protected $appends = array('name');
protected $hidden = array('first_name', 'last_name'); //this is optional
public function getNameAttribute()
{
return $this->attributes['first_name'] . ' ' . $this->attributes['last_name'];
}
it is little old post but you can also do this,
public function from()
{
return $this->belongsTo('User', 'fromID')
->select(array('id',DB::raw("CONCAT(firstname,' ', lastname) as name")));
}