PDO driver constructors are throwing PdoException without setting
errorInfo, so create a new reusable function that throws exceptions
for PDO and will also set the errorInfo. Use this function in
pdo_mysql, pdo_sqlite, and pdo_pgsql.
You must set the following environment variables to run the tests:
PDO_MYSQL_TEST_DSN - DSN
For example: mysql:dbname=test;host=localhost;port=3306
PDO_MYSQL_TEST_HOST - database host
PDO_MYSQL_TEST_DB - database (schema) name
PDO_MYSQL_TEST_SOCKET - database server socket
PDO_MYSQL_TEST_ENGINE - storage engine to use
PDO_MYSQL_TEST_USER - database user
PDO_MYSQL_TEST_PASS - database user password
PDO_MYSQL_TEST_CHARSET - database charset
NOTE: if any of PDO_MYSQL_TEST_[HOST|DB|SOCKET|ENGINE|CHARSET] is
part of PDO_MYSQL_TEST_DSN, the values must match. That is, for example,
for PDO_MYSQL_TEST_DSN = mysql:dbname=test you MUST set PDO_MYSQL_TEST_DB=test.
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