Pear DB 新手入门指南教程第1/3页_PHP教程

<font face="黑体">存放</font>Pear<font face="黑体">的目录：</font>

<b># cd /usr/local/lib</b>

<font face="黑体">用“</font>phpfi<font face="黑体">“口令登录</font>:

<b># cvs -d :pserver:cvsread@cvs.php.net:/repository login</b>

<font face="黑体">用以下命令得到所有的</font>pear<font face="黑体">文件，同时也可以用来更新已经下载的文件。其他的参数有：</font>"today", "last month",<font face="黑体">等。我推荐用</font>"last week"<font face="黑体">参数，因为一般</font>bugs<font face="黑体">的提交和修改都是每周一次。</font> 

<b># cvs -d :pserver:cvsread@cvs.php.net:/repository export -D "last week" php4/pear</b>

<font face="黑体">编辑</font>php.ini<font face="黑体">文件加上下面一段在</font>include_path<font face="黑体">处：</font><i> /usr/local/lib/php4/pear</i> <font face="黑体">如果没有修改的权限，可以通过这条语句在代码中实现：</font> <i>ini_set('include_path', 'path_to_pear');</i>

<code><?php </CODE><br> <code>// The pear base directory must be in your include_path</code><br> <code>require_once </code><code>'DB.php'</code><code>;</code><br> <code>$user </code><code>= </code><code>'foo'</code><code>;</code><br> <code>$pass </code><code>= </code><code>'bar'</code><code>;</code><br> <code>$host </code><code>= </code><code>'localhost'</code><code>;</code><br> <code>$db_name </code><code>= </code><code>'clients_db'</code><code>;</code><br><br> <code>// Data Source Name: This is the universal connection string</code><br> <code>$dsn </code><code>= </code><code>"mysql://$user:$pass@$host/$db_name"</code><code>;</code><br><br> <code>// DB::connect will return a Pear DB object on success</code><br> <code>// or a Pear DB Error object on error</code><br> <code>// You can also set to TRUE the second param</code><br> <code>// if you want a persistent connection:</code><br> <code>// $db = DB::connect($dsn, true);</code><br> <code>$db </code><code>= </code><code>DB</code><code>::</code><code>connect</code><code>(</code><code>$dsn</code><code>);</code><br><br> <code>// With DB::isError you can differentiate between an error or</code><br> <code>// a valid connection.</code><br> <code>if (</code><code>DB</code><code>::</code><code>isError</code><code>(</code><code>$db</code><code>)) {</code><br> <code>        die (</code><code>$db</code><code>-></code><code>getMessage</code><code>());</code><br> <code>}</code><br> <code>....</code><br> <code>// You can disconnect from the database with:</code><br> <code>$db</code><code>-></code><code>disconnect</code><code>();</code><br> <code>?></code><code></code></code>

<code>     *  phptype: Database backend used in PHP (mysql, odbc etc.)</code><br> <code>     *  dbsyntax: Database used with regards to SQL syntax etc.</code><br> <code>     *  protocol: Communication protocol to use (tcp, unix etc.)</code><br> <code>     *  hostspec: Host specification (hostname[:port])</code><br> <code>     *  database: Database to use on the DBMS server</code><br> <code>     *  username: User name for login</code><br> <code>     *  password: Password for login</code><br> <code>     *</code><br> <code>     * The format of the supplied DSN is in its fullest form:</code><br> <code>     *</code><br> <code>     *  phptype(dbsyntax)://username:password@protocol+hostspec/database</code><br> <code>     *</code><br> <code>     * Most variations are allowed:</code><br> <code>     *</code><br> <code>     *  phptype://username:password@protocol+hostspec:110//usr/db_file.db</code><br> <code>     *  phptype://username:password@hostspec/database_name</code><br> <code>     *  phptype://username:password@hostspec</code><br> <code>     *  phptype://username@hostspec</code><br> <code>     *  phptype://hostspec/database</code><br> <code>     *  phptype://hostspec</code><br> <code>     *  phptype(dbsyntax)</code><br> <code>     *  phptype</code><code></code>

<code>mysql  -> MySQL</code><br> <code>pgsql  -> PostgreSQL</code><br> <code>ibase  -> InterBase</code><br> <code>msql   -> Mini SQL</code><br> <code>mssql  -> Microsoft SQL Server</code><br> <code>oci8   -> Oracle 7/8/8i</code><br> <code>odbc   -> ODBC (Open Database Connectivity)</code><br> <code>sybase -> SyBase</code><br> <code>ifx    -> Informix</code><br> <code>fbsql  -> FrontBase</code><code></code>

<code><?php </CODE><br> <code>// Once you have a valid DB object</code><br> <code>...</code><br> <code>$sql </code><code>= </code><code>"select * from clients"</code><code>;</code><br> <code>// If the query is a "SELECT", $db->query will return</code><br> <code>// a DB Result object on success.</code><br> <code>// Else it simply will return a DB_OK</code><br> <code>// On failure it will return a DB Error object.</code><br> <code>$result </code><code>= </code><code>$db</code><code>-></code><code>query</code><code>(</code><code>$sql</code><code>);</code><br> <code>// Always check that $result is not an error</code><br> <code>if (</code><code>DB</code><code>::</code><code>isError</code><code>(</code><code>$result</code><code>)) {</code><br> <code>        die (</code><code>$result</code><code>-></code><code>getMessage</code><code>());</code><br> <code>}</code><br> <code>....</code><br> <code>?></code><code></code></code>