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    3. 

  3.  <head>
    4. 

  4.   <meta http-equiv="content-type" content="text/html; charset=UTF-8">
    5. 

  5.   <title>需求</title>
    6. 

  6. 

  7.  </head>
    8. 

  8.  <body><div class="manualnavbar" style="text-align: center;">
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  9.  <div class="prev" style="text-align: left; float: left;"><a href="dba.setup.html">安装／配置</a></div>
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  13. </div><hr /><div id="dba.requirements" class="section">
    14. 

  14.   <h2 class="title">需求</h2>
    15. 

  15.   <p class="para">
    16. 

  16.    The behaviour of various aspects depends on the implementation of the
    17. 

  17.    underlying database. Functions such as  <span class="function"><a href="function.dba-optimize.html" class="function">dba_optimize()</a></span>
    18. 

  18.    and  <span class="function"><a href="function.dba-sync.html" class="function">dba_sync()</a></span> will do what they promise for one
    19. 

  19.    database and will do nothing for others. You have to download and install
    20. 

  20.    supported dba-Handlers.
    21. 

  21.   <table class="doctable table">
    22. 

  22.    <caption><strong>List of DBA handlers</strong></caption>
    23. 

  23.    
    24. 

  24.     <thead>
    25. 

  25.      <tr>
    26. 

  26.       <th>Handler</th>
    27. 

  27.       <th>Notes</th>
    28. 

  28.      </tr>
    29. 

  29. 

  30.     </thead>
    31. 

  31. 

  32.     <tbody class="tbody">
    33. 

  33.      <tr>
    34. 

  34.       <td><em>dbm</em></td>
    35. 

  35.       <td>
    36. 

  36.        Dbm is the oldest (original) type of Berkeley DB style
    37. 

  37.        databases. You should avoid it, if possible. We do not support
    38. 

  38.        the compatibility functions built into DB2 and gdbm, because
    39. 

  39.        they are only compatible on the source code level, but cannot
    40. 

  40.        handle the original dbm format.
    41. 

  41.       </td>
    42. 

  42.      </tr>
    43. 

  43. 

  44. 

  45.      <tr>
    46. 

  46.       <td><em>ndbm</em></td>
    47. 

  47.       <td>
    48. 

  48.        Ndbm is a newer type and more flexible than dbm. It still has
    49. 

  49.        most of the arbitrary limits of dbm (therefore it is
    50. 

  50.        deprecated).
    51. 

  51.       </td>
    52. 

  52.      </tr>
    53. 

  53. 

  54. 

  55.      <tr>
    56. 

  56.       <td><em>gdbm</em></td>
    57. 

  57.       <td>
    58. 

  58.        Gdbm is the <a href="ftp://ftp.gnu.org/pub/gnu/gdbm/" class="link external">&raquo;&nbsp;GNU database
    59. 

  59.        manager</a>.
    60. 

  60.       </td>
    61. 

  61.      </tr>
    62. 

  62. 

  63. 

  64.      <tr>
    65. 

  65.       <td><em>db2</em></td>
    66. 

  66.       <td>
    67. 

  67.        DB2 is for <a href="http://www.sleepycat.com/" class="link external">&raquo;&nbsp;Oracle Berkeley
    68. 

  68.        DB 2</a>. It is described as &quot;a programmatic toolkit that
    69. 

  69.        provides high-performance built-in database support for both
    70. 

  70.        standalone and client/server applications.
    71. 

  71.       </td>
    72. 

  72.      </tr>
    73. 

  73. 

  74. 

  75.      <tr>
    76. 

  76.       <td><em>db3</em></td>
    77. 

  77.       <td>
    78. 

  78.        DB3 is for <a href="http://www.sleepycat.com/" class="link external">&raquo;&nbsp;Oracle Berkeley DB
    79. 

  79.        3</a>.
    80. 

  80.       </td>
    81. 

  81.      </tr>
    82. 

  82. 

  83. 

  84.      <tr>
    85. 

  85.       <td><em>db4</em></td>
    86. 

  86.       <td>
    87. 

  87.        DB4 is for <a href="http://www.sleepycat.com/" class="link external">&raquo;&nbsp;Oracle Berkeley DB
    88. 

  88.        4 or 5</a>. This option is available from PHP 4.3.2.  It can
    89. 

  89.        be used with BDB 5 from PHP 5.3.3.
    90. 

  90.       </td>
    91. 

  91.      </tr>
    92. 

  92. 

  93. 

  94.      <tr>
    95. 

  95.       <td><em>cdb</em></td>
    96. 

  96.       <td>
    97. 

  97.        Cdb is &quot;a fast, reliable, lightweight package for creating and
    98. 

  98.        reading constant databases.&quot; It is from the author of qmail and
    99. 

  99.        can be found at <a href="http://cr.yp.to/cdb.html" class="link external">&raquo;&nbsp;http://cr.yp.to/cdb.html</a>. Since it is
    100. 

  100.        constant, we support only reading operations. And since PHP 4.3.0
    101. 

  101.        we support writing (not updating) through the internal cdb library.
    102. 

  102.       </td>
    103. 

  103.      </tr>
    104. 

  104. 

  105. 

  106.      <tr>
    107. 

  107.       <td><em>cdb_make</em></td>
    108. 

  108.       <td>
    109. 

  109.        Since PHP 4.3.0 we support creation (not updating) of cdb files 
    110. 

  110.        when the bundled cdb library is used.
    111. 

  111.       </td>
    112. 

  112.      </tr>
    113. 

  113. 

  114. 

  115.      <tr>
    116. 

  116.       <td><em>flatfile</em></td>
    117. 

  117.       <td>
    118. 

  118.        This is available since PHP 4.3.0 for compatibility with the deprecated
    119. 

  119.        <em>dbm</em> extension only and should be avoided. 
    120. 

  120.        However you may use this where files were created in this format. That
    121. 

  121.        happens when configure could not find any external library.
    122. 

  122.       </td>
    123. 

  123.      </tr>
    124. 

  124. 

  125. 

  126.      <tr>
    127. 

  127.       <td><em>inifile</em></td>
    128. 

  128.       <td>
    129. 

  129.        This is available since PHP 4.3.3 to be able to modify php.ini files 
    130. 

  130.        from within PHP scripts. When working with ini files you can pass arrays 
    131. 

  131.        of the form array(0=&gt;group,1=&gt;value_name) or strings of the form 
    132. 

  132.        &quot;[group]value_name&quot; where group is optional. As the functions 
    133. 

  133.         <span class="function"><a href="function.dba-firstkey.html" class="function">dba_firstkey()</a></span> and  <span class="function"><a href="function.dba-nextkey.html" class="function">dba_nextkey()</a></span>
    134. 

  134.        return string representations of the key there is a new function
    135. 

  135.         <span class="function"><a href="function.dba-key-split.html" class="function">dba_key_split()</a></span> available since PHP 5 which allows
    136. 

  136.        to convert the string keys into array keys without loosing <strong><code>FALSE</code></strong>.
    137. 

  137.       </td>
    138. 

  138.      </tr>
    139. 

  139. 

  140. 

  141.      <tr>
    142. 

  142.       <td><em>qdbm</em></td>
    143. 

  143.       <td>
    144. 

  144.        This is available since PHP 5.0.0. The qdbm library can be loaded from
    145. 

  145.        <a href="http://fallabs.com/qdbm/index.html" class="link external">&raquo;&nbsp;http://fallabs.com/qdbm/index.html</a>.
    146. 

  146.       </td>
    147. 

  147.      </tr>
    148. 

  148. 

  149. 

  150.     </tbody>
    151. 

  151.    
    152. 

  152.   </table>
    153. 

  153. 

  154.   </p>
    155. 

  155.   <p class="para">
    156. 

  156.    When invoking the  <span class="function"><a href="function.dba-open.html" class="function">dba_open()</a></span> or
    157. 

  157.     <span class="function"><a href="function.dba-popen.html" class="function">dba_popen()</a></span> functions, one of the
    158. 

  158.    handler names must be supplied as an argument. The actually
    159. 

  159.    available list of handlers is displayed by invoking
    160. 

  160.     <span class="function"><a href="function.phpinfo.html" class="function">phpinfo()</a></span> or  <span class="function"><a href="function.dba-handlers.html" class="function">dba_handlers()</a></span>.
    161. 

  161.   </p>
    162. 

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    163. 

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    167. 

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    168. 

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