We can utilize the PostgreSQL support services offered by IbmiMedia in order to gain knowledge on how to eliminate the error 23502 PostgreSQL not null violation auto increment.
The error 23502 PostgreSQL not null violation auto increment occurs when you try to insert a null value into a column that has a not null constraint.
This can happen for a number of reasons, such as:
An error of "23502 PostgreSQL not null violation auto increment" is frequently seen when we attempt to insert a row in a PostgreSQL table with an auto incrementing column that has a not null constraint, but we have failed to assign a value for that column.
The "23502 PostgreSQL not null violation auto increment" error is thrown when a row is attempted to be inserted into a table with an auto-incrementing column, but no value is provided for that column, which violates the not-null constraint.
PostgreSQL requires either an explicit valid value to be supplied or an auto-increment method to be used due to a not-null requirement of the column.
For example, say you have a table like this:
CREATE TABLE products (
id SERIAL PRIMARY KEY,
name TEXT NOT NULL
);
The id column is defined as SERIAL which means it will auto-increment for each new row. If you try to insert a new product without specifying an id:
INSERT INTO products (name) VALUES ('Widget');
You'll get the error:
ERROR: 23502: not null violation: field "id" violates not-null constraint
This is because the id column cannot be null, and by not specifying a value in the INSERT statement, you're trying to set it to null.
1. Simply omit the id column from the INSERT:
INSERT INTO products (name) VALUES ('Widget');
PostgreSQL will populate the id column automatically using the auto-increment setting.
2. Specify a placeholder value for the id in the INSERT:
INSERT INTO products (id, name) VALUES (default, 'Widget');
Using default for the id field tells PostgreSQL to populate it with the auto-increment value.
We should be able to rectify the "23502 PostgreSQL not null violation auto increment" issue, and accordingly insert rows into the table with an auto incrementing column and not null constraint, if we tackle these points.
So in fact, to resolve the error 23502 and do an auto-incrementing INSERT in PostgreSQL, you have two options:
Either of these options will allow PostgreSQL to populate the auto-incrementing id column automatically and insert the new row successfully.