I have created a table in postgres with some timestamp columns.
create table glacier_restore_progress_4(
id SERIAL NOT NULL ,
email VARCHAR(50),
restore_start timestamp,
restore_end timestamp,
primary key (id)
);
In the dbeaver client, it shows those timestamp column value as "2021-06-22 03:25:00". But when i try to fetch them via an API, those value will become "2021-06-22T03:25:00.000Z". How to get rid from it.
I tried to change the data type of the columns in dbeaver client. They didn't work
I am using postgresql and sqlalchemy for my flask project.
I recently partitioned one of my big tables based on created_on using postgresql triggers.
But now if a try to insert a record into master table with db.session.add(obj) in sqlalchemy, i am getting error saying
Instance has a NULL identity key. If this is an auto-generated value, check that the database table allows generation of new primary key values, and that the mapped Column object is configured to expect these generated values. Ensure also that this flush() is not occurring at an inappropriate time, such as within a load() event.
Here I am using a sequence to increment my primary key. Please help me with this.
use autoincrement=True while defining your column example in my code sno is an autoincrement field :
class Contact(db.Model):
sno = db.Column(db.Integer, primary_key=True,autoincrement=True)
I know there are dozens of tutorials for how to do this across just as many websites, but this is my first time trying to connect a database table to a UI, so when the version of Spring Boot/MyBatis/Vaadin, for example, are different than the one I'm working with, or they use JPA or JDBC instead of MyBatis, I have no idea how to change it to work with my specific situation.
When people say "it's no different than any other method of doing it with " that doesn't help AT ALL, since, as I stated earlier, I've never done it before. Annotations and classes in the code examples of a tutorial get removed and deprecated with every new version with no clear explanation of how to change it to work with the newer version. I've been researching the various APIs (Spring Boot, Vaadin, MyBatis) for about a month and have a vague understanding of what each one does but not how they work together to achieve the desired result of making a UI for a database. I'm just getting really frustrated at how a single deprecated annotation or class in a tutorial can bring the whole thing crashing down. I know that was long-winded but I just wanted you all to understand where I'm coming from. I'm not particularly attached to any single API, just whatever is easiest.
My current dependencies are:
- Maven : 4.0.0
- Spring Boot: 2.1.2.RELEASE
- Vaadin: 12.0.4
- MyBatis Spring Boot Starter: 2.0.0
I got the starter package from Spring Initializr and added the MyBatis dependency later.
I have a PostgreSQL 10.5 database with 17 tables that will eventually be a UI for a store manager to use for things like looking at received inventory shipments, the hours an employee worked, and other tasks.
My database is named 'store', user: 'store', password: 'store' (if it matters).
For example, these are a few of my tables:
CREATE TABLE IF NOT EXISTS supplier (
id SERIAL,
brand VARCHAR(30) NOT NULL,
phone VARCHAR(15) NOT NULL,
address VARCHAR(100) NOT NULL,
CONSTRAINT pk_supplier PRIMARY KEY (id)
);
CREATE TABLE IF NOT EXISTS shipment (
id SERIAL,
shipdate DATE NOT NULL,
shiptime TIME NOT NULL,
status VARCHAR(10) DEFAULT 'arrived' NOT NULL,
sid INT NOT NULL,
CONSTRAINT pk_shipment PRIMARY KEY (id),
CONSTRAINT fk_shipment_supplier FOREIGN KEY (sid)
REFERENCES supplier(id)
);
CREATE TABLE IF NOT EXISTS shipmentcontains (
shipid INT NOT NULL,
iid INT NOT NULL,
quantity INT NOT NULL,
price DEC(6,2) NOT NULL,
CONSTRAINT pk_shipmentcontains PRIMARY KEY (shipid, iid),
CONSTRAINT fk_shipmentcontains_shipment FOREIGN KEY (shipid)
REFERENCES shipment(id),
CONSTRAINT fk_shipmentcontains_item FOREIGN KEY (iid)
REFERENCES item(id)
);
CREATE TABLE IF NOT EXISTS item (
id SERIAL,
itemtype VARCHAR(25) NOT NULL,
itemsize VARCHAR(10) NOT NULL,
price DEC(5,2) NOT NULL,
sid INT NOT NULL,
CONSTRAINT pk_item PRIMARY KEY (id),
CONSTRAINT fk_item_supplier FOREIGN KEY (sid)
REFERENCES supplier(id)
);
CREATE TABLE IF NOT EXISTS employee (
id SERIAL,
lastname VARCHAR(40) NOT NULL,
firstname VARCHAR(40) NOT NULL,
hourlywage DEC(4,2),
manager BOOLEAN DEFAULT false NOT NULL,
CONSTRAINT pk_employee PRIMARY KEY (id)
);
If someone can give me a code example of how to just get one of those to show in a Grid, I'm sure I can figure out how to do the rest of it. I have the connection details in my application.properties file, but I've seen that with newer versions of MyBatis this isn't needed and annotations such as #Update can be used on the SQL statements to replace that. Also, in plain English, what the heck is a Spring Bean? I hope that wasn't too long..or not long enough.
EDIT: Current version of Vaadin 12 is 12.0.4
You are asking quite a lot, so I will try to touch everything a little and nothing too detailed. I hope this helps you getting the ball rolling.
First off, you will need a java class with all fields that you have in the supplier table, annotated with #Entity. The #Table annotation lets you define the Db table name, and it is not necessary if the table is called the same as the class (case insensitive):
#Entity // javax.persistence
#Table(name = "supplier") // javax.persistence
public class Supplier {
#Id // javax.persistence
private Long id;
private String brand;
private String phone;
private String address;
public Supplier(){
}
// public getters and setters for all fields
// omitted for brevity
}
Now that you have a class for your table, you can start with creating a Vaadin Grid for it. This can be done the easiest with Grid<Supplier> supplierGrid = new Grid<Supplier>(Supplier.class);.
Now to fill the grid with items (suppliers). This is done with supplierGrid.setItems(allSuppliers);. But where do allSuppliers come from you ask?
They can be fetched using a Repository. Because the repository will be annotated with #Repository, its a spring component that can be automatically generated by spring and can be Injected/Autowired (i.e. in your view) using #Inject/#Autowired.
Then you simply call List<Supplier> allSuppliers = supplierRepository.findAll() and you have a list of all suppliers from your DB, that you now can put into the grid with the aforementioned supplierGrid.setItems(allSuppliers);
Any class where an instance of it can be injected by spring is a spring-bean, this includes classes annotated with either #Component, #Serivce or #Repository. Entities like Supplier can not automatically be injected by Spring, unless you define this is your #Configuration class:
/* Do this only if you want to inject a Supplier somewhere. */
#Bean
public Supplier supplier(){
/* define here how a default Supplier should look like */
return new Supplier();
}
I have two tables Employee and Address having one-to-one relationship.
CREATE TABLE EMPLOYEE(
ID BIGINT PRIMARY KEY NOT NULL,
EMP_NAME VARCHAR(50) NOT NULL,
PHONE_ID BIGINT,
DELETED BOOLEAN NOT NULL DEFAULT FALSE,
CONSTRAINT CONSTRAINT1 FOREIGN KEY (PHONE_ID)
REFERENCES PHONE (ID)
)
CREATE TABLE PHONE(
ID BIGINT PRIMARY KEY NOT NULL,
PH_NUMBER VARCHAR(20) NOT NULL,
DELETED BOOLEAN NOT NULL DEFAULT FALSE,
)
I am using Spring Data REST.
Q1. I want to expose a single data rest repository method to update DELETED column for both EMPLOYEE and `PHONE.
Something like below:
TestRepository implements CrudRepository{
#Query(value="update both table query", native=false)
public void updateBoth();
}
Q2. Is doing so even possible using Spring data REST.
PLEASE NOTE: I do not want to use native query, i.e. #Query(value="", native="true")
You have to find the balance between using the framework properly and overusing it.
Spring Data REST is to expose your repositories to HTTP but you can't solve everything with it.
The proper way here is to create a custom Controller and implement the functionality you want with proper transaction management to have the data integrity you need.
I have a set of files on S3 that I am trying to load into redshift.
I am using the amazon data pipeline to do it. the wizard took the cluster, db and file format info but I get errors that a primary key is needed to keep existing fields in th table (KEEP_EXISTING) on the table
My table schema is:
create table public.Bens_Analytics_IP_To_FileName(
Day date not null encode delta32k,
IP varchar(30) not null encode text255,
FileName varchar(300) not null encode text32k,
Count integer not null)
distkey(Day)
sortkey(Day,IP);
so then I added a composite primary key on the table to see if it will work, but I get the same error.
create table public.Bens_Analytics_IP_To_FileName(
Day date not null encode delta32k,
IP varchar(30) not null encode text255,
FileName varchar(300) not null encode text32k,
Count integer not null,
primary key(Day,IP,FileName))
distkey(Day)
sortkey(Day,IP);
So I decided to add an identity column as the last column and made it the primary key but then the COPY operation wants a value in the input files for that identity column which did not make much sense
ideally I want it to work without a primary key or a composite primary key
any ideas?
Thanks
Documentation is not in a great condition. They have added a 'mergeKey' concept that can be any arbitrary key (announcement, docs). You should not have to define a primary key on table with this.
But you would still need to supply a key to perform join between your new data coming in and the existing data in redshift table.
In Edit Pipeline, under Parameters, there is a field named: myPrimaryKeys (optional). Enter you Pk there, instead of adding it to your table definition.