本文实例总结了PHP中PDO连接数据库中各种DNS设置方法。分享给大家供大家参考，具体如下：

pdo中DNS书写方式如下：

mssql:host=localhost;dbname=testdb

sybase:host=localhost;dbname=testdb

dblib:host=localhost;dbname=testdb

firebird:User=john;Password=mypass;Database=DATABASE.GDE;DataSource=localhost;Port=305

DRIVER={IBM DB2 ODBC DRIVER};DATABASE=database ;HOSTNAME=hostname ;PORT=port ;PROTOCOL=TCPIP;UID=username ;PWD=password ;

informix:host=host.domain.com; service=9800;

database=common_db; server=ids_server; protocol=onsoctcp;

EnableScrollableCursors=1

mysql:host=localhost;port=3307;dbname=testdb

mysql:unix_socket=/tmp/mysql.sock;dbname=testdb

oci:dbname=//localhost:1521/mydb

odbc:testdb

odbc:DRIVER={IBM DB2 ODBC DRIVER};HOSTNAME=localhost;PORT=50000;DATABASE=SAMPLE;PROTOCOL=TCPIP;UID=db2inst1;PWD=ibmdb2;

odbc:Driver={Microsoft Access Driver (*.mdb)};Dbq=C:\\db.mdb;Uid=Admin

pgsql:host=localhost port=5432 dbname=testdb user=bruce password=mypass

sqlite:/opt/databases/mydb.sq3

sqlite::memory:

sqlite2:/opt/databases/mydb.sq2

sqlite2::memory

希望本文所述对大家PHP程序设计有所帮助。