How to switch databases in psql?

问题

In MySQL I used use database_name;

What\'s the psql equivalent?

回答1:

In PostgreSQL, you can use the \connect meta-command of the client tool psql:

\connect DBNAME

or in short:

\c DBNAME

回答2:

You can connect to a database with \c <database> or \connect <database>.

回答3:

At the PSQL prompt, you can do:

\connect (or \c) dbname

回答4:

You can select the database when connecting with psql. This is handy when using it from a script:

sudo -u postgres psql -c "CREATE SCHEMA test AUTHORIZATION test;" test

回答5:

You can connect using

\c dbname

回答6:

Using psql's meta-command \c or \connect [ dbname [ username ] [ host ] [ port ] ] | conninfo (see documentation).

Example: \c MyDatabase

Note that the \c and \connect meta-commands are case-sensitive.

回答7:

\l for databases \c DatabaseName to switch to db \df for procedures stored in particular database

回答8:

Use below statement to switch to different databases residing inside your postgreSQL RDMS

\c databaseName

回答9:

If you want to switch to a specific database on startup, try

/Applications/Postgres.app/Contents/Versions/9.5/bin/psql vigneshdb;

By default, Postgres runs on the port 5432. If it runs on another, make sure to pass the port in the command line.

/Applications/Postgres.app/Contents/Versions/9.5/bin/psql -p2345 vigneshdb;

By a simple alias, we can make it handy.

Create an alias in your .bashrc or .bash_profile

function psql()
{
    db=vigneshdb
    if [ "$1" != ""]; then
            db=$1
    fi
    /Applications/Postgres.app/Contents/Versions/9.5/bin/psql -p5432 $1
}

Run psql in command line, it will switch to default database; psql anotherdb, it will switch to the db with the name in argument, on startup.

回答10:

Though not explicitly stated in the question, the purpose is to connect to a specific schema/database.

Another option is to directly connect to the schema. Example:

sudo -u postgres psql -d my_database_name

Source from man psql:

-d dbname
--dbname=dbname
   Specifies the name of the database to connect to. This is equivalent to specifying dbname as the first non-option argument on the command line.

   If this parameter contains an = sign or starts with a valid URI prefix (postgresql:// or postgres://), it is treated as a conninfo string. See Section 31.1.1, “Connection Strings”, in the
   documentation for more information.

回答11:

You can connect using

\c dbname

If you would like to see all possible commands for POSTGRESQL or SQL follow this steps :

1. rails dbconsole (You will redericted to your current ENV database)

2. \? (For POSTGRESQL commands)

or

2. \h (For SQL commands)

3. Press Q to Exit

回答12:

You can also connect to a database with a different ROLE as follows.

\connect DBNAME ROLENAME;

or

\c DBNAME ROLENAME;

回答13:

As mentioned in the other answers, you need to change connection to use a different database.

Postgres works with schemas. You can have multiple schemes in a single database. So, if you're working within the same database, and want to change schema, You can do:

SET SCHEMA 'schema_name';

来源：https://stackoverflow.com/questions/3949876/how-to-switch-databases-in-psql