![]() It helps simplify the queries and can be executed simply by different clients. We have provided different ways to carve out the duplicate exception error.Ĭreating a function from the best-chosen solution above would be the recommended way to go. There may be issues with different versions of PostgreSQL in many other instances. We are better off using transaction or code blocks that run queries in a single stance in those conditions. In the case of multiple clients accessing a database on a server and then executing a query, there may be RACE conditions that we want to avoid. However, different solutions work for different circumstances. Similar error persists for the root account. h9uest is my account name, and I sudo apt-get install PostgreSQL 9.1 under this account. We have looked at various ways to approach the duplicate error in creating a role in PostgreSQL. I can't do anything with PostgreSQL: can't createdb, can't createuser all operations return the error message. The adjustment would go as follows.ĬREATE ROLE mark LOGIN PASSWORD 'mark123' I think the some part of this problem may be in owner settings in OSX. Rather than entering this code block all the time to check, we can make sure that our queries only use this code block if there is a RACE CONDITION at all else, skip it and walk through. masi psql psql: FATAL: database 'masi' does not exist masi psql -U postgres psql: FATAL: role 'postgres' does not exist masi psql postgres psql (9.4.1) Type 'help' for help. ![]() Hence, we can now make a simple adjustment. The solution above tends to be expensive due to the EXCEPTION clause added inside a code block.ĭue to difficulty entering and exiting this code block containing the EXCEPTION clause, this tends to happen. ![]() To prevent the RACE condition, we can use the solution given above and append it to the query we have used here. Another transaction would have already come here and raised the notice, which may invalidate this operation. RACE conditions tend to be an issue in this solution because if you call the IF EXISTS check and wait for the query to raise the notice if it returns TRUE. So make sure to know where you define your roles, then modify the code as it works suitably with your conditions. However, this may return an error if your role is not defined under the PG_ROLES table. IF EXISTS (SELECT FROM pg_catalog.pg_rolesĬREATE ROLE MARK LOGIN PASSWORD 'mark123' This may be a modification of the solution provided above. We can create a procedure with the IF EXISTS condition to RAISE NOTICE if a duplicate violation is found. Use IF EXISTS to Define Duplication Violation Condition The system user postgres is created automatically by the Postgres installer. Using the troubleshooting section I used to the server manual for more information on the issue. You have first to login in a linux shell as the user postgres and than create new postgres user with the command createuser. After installation and opening psql, this is the message I get. Unlike the solutions provided below, this works perfectly considering other circumstances. I am new to psql and am trying to set it up using the Postgres.app site on my Mac. ![]() Second, if a database already exists, it doesnt matter what you set for POSTGRESUSER and POSTGRESPASSWORD - postgres will use whatever is in the database. It works perfectly as this does not have a delay between checking and calling the duplicate exception.Īlso, if you call this from a different language or PL/SQL script, it will still issue the correct return SQLSTATE. First, youve set POSTGRESUSER to root, so youre going to have a root user instead of postgres user. This solution helps prevent RACE conditions. SQLERRM is short for SQL ERROR MESSAGE and contains a string that describes the error message with the returning SQLSTATE.ĭO initiates a code block, mostly a procedure, inside a transaction. This has one disadvantage: race condition. Other errors or faults will be skipped, and NOTICE won’t be raised. ad1 Some answers suggested to use pattern: check if role does not exist and if not then issue CREATE ROLE command. Meaning that it will only throw an error if duplication is found. Sudo apt-get install postgresql libpq-devĬ) On my remote server, I logged into psql and created a new user to match my Rails app: sudo -u postgres psqlĬreate user 'my_app' with password 'secret' Ĭreate database my_app_production owner my_app įor deployment, I'm using the deployer user.In our statement, we raised a NOTICE when an EXCEPTION is caught on a duplicate_object. Ssh-copy-id I logged in as deployer and installed Postgres sudo add-apt-repository ppa:pitti/postgresql ![]() Psql: FATAL: role "deployer" does not existĪ) As I created a new group admin and a new user deployer groupadd admin I suspect it's because Postgres expects the user logging into it to be the same user logged into Ubuntu (12.10). My Rails app can't connect to Postgresql. ![]()
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