MySQL:

CREATE DATABASE ${database};
USE ${database};
CREATE USER '${username}' IDENTIFIED BY '${password}';
GRANT SELECT,INSERT,UPDATE,DELETE ON ${database}.* TO '${username}';

PostgreSQL:

CREATE USER ${username} WITH PASSWORD '${password}';
CREATE DATABASE ${database} WITH OWNER ${username};

MSSQL:

USE MASTER;
CREATE DATABASE ${database};
USE ${database};
CREATE LOGIN ${username} WITH PASSWORD = '${password}';
CREATE USER ${username} FOR LOGIN ${username};

Sybase:

sp_addlogin ${username}, ${password};
CREATE DATABASE ${database};
USE ${database};
sp_adduser ${username};

Oracle:

CREATE TABLESPACE "${database}" DATAFILE '/var/oracle_db/orclvm/${database}' SIZE 10M AUTOEXTEND ON NEXT 6M MAXSIZE UNLIMITED LOGGING EXTENT MANAGEMENT LOCAL SEGMENT SPACE MANAGEMENT AUTO;
CREATE TEMPORARY TABLESPACE "${database}.TEMP" TEMPFILE '/var/oracle_db/orclvm/${database}.temp' SIZE 5M AUTOEXTEND ON NEXT 5M MAXSIZE UNLIMITED EXTENT MANAGEMENT LOCAL UNIFORM SIZE 1M;
CREATE USER "${username}" PROFILE "DEFAULT" IDENTIFIED BY "${password}" DEFAULT TABLESPACE "${database}" TEMPORARY TABLESPACE "${database}.TEMP" ACCOUNT UNLOCK;
GRANT CREATE SEQUENCE TO "${username}";
GRANT CREATE TABLE TO "${username}";
GRANT CREATE TRIGGER TO "${username}";
GRANT UNLIMITED TABLESPACE TO "${username}";
GRANT "CONNECT" TO "${username}";
GRANT "RESOURCE" TO "${username}";