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>SDO_DAS_Relational::__construct</H1
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><P
>    (no version information, might be only in CVS)</P
>SDO_DAS_Relational::__construct&nbsp;--&nbsp;
	    Creates an instance of a Relational Data Access Service
  </DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN205141"
></A
><H2
>说明</H2
>SDO_DAS_Relational <B
CLASS="methodname"
>SDO_DAS_Relational::__construct</B
> ( array database_metadata [, string application_root_type [, array SDO_containment_references_metadata]] )<BR
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>警告</B
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>本函数是<SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>实验性</I
></SPAN
>的。本函数的行为，包括函数名称以及其它任何关于本函数的文档可能会在没有通知的情况下随
PHP 以后的发布而改变。使用本函数风险自担。</P
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><P
>&#13;   Constructs an instance of a Relational Data Access Service 
   from the passed metadata.
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN205159"
></A
><H2
>参数</H2
><P
>&#13;   <P
></P
><DIV
CLASS="variablelist"
><DL
><DT
>database_metadata</DT
><DD
><P
>&#13;       An array containing one or more table definitions, 
       each of which is an associative array containing the keys
       <CODE
CLASS="varname"
>name</CODE
>,
       <CODE
CLASS="varname"
>columns</CODE
>,
       <CODE
CLASS="varname"
>PK</CODE
>, and optionally,
       <CODE
CLASS="varname"
>FK</CODE
>.
       For a full discussion of the metadata, see the
       <A
HREF="ref.sdo.das.rel.html#sdo.das.rel.metadata"
>metadata</A
>
       section in the general information about the Relational DAS.
      </P
></DD
><DT
>application_root_type</DT
><DD
><P
>&#13;       The root of each data graph is an object of a special root type and 
       the application data objects come below that.
       Of the various application types in the SDO model, 
       one has to be the the application type immediately 
       below the root of the data graph.
       If there is only one table in the database metadata, 
       so the application root type can be inferred, this argument can be omitted.
      </P
></DD
><DT
>SDO_containment_references_metadata</DT
><DD
><P
>&#13;       An array containing one or more definitions of a containment relation, 
       each of which is an associative array containing the keys
       <CODE
CLASS="varname"
>parent</CODE
>
       and
       <CODE
CLASS="varname"
>child</CODE
>.
       The containment relations describe how the types in the model 
       are connected to form a tree.
       The type specified as the application root type must be present 
       as one of the parent types in the containment references.
       If the application only needs to work with one table at a time, 
       and there are no containment relations in the model, 
       this argument can be omitted.
       For a full discussion of the metadata, see the
       <A
HREF="ref.sdo.das.rel.html#sdo.das.rel.metadata"
>metadata</A
>
       section in the general information about the Relational DAS.
      </P
></DD
></DL
></DIV
>
  </P
></DIV
><DIV
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><A
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></A
><H2
>返回值</H2
><P
>&#13;   Returns an SDO_DAS_Relational object on success.
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN205186"
></A
><H2
>错误／异常</H2
><P
>&#13;   <B
CLASS="function"
>SDO_DAS_Relational::__construct()</B
>
   throws a SDO_DAS_Relational_Exception if 
   any problems are found in the metadata.
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN205190"
></A
><H2
>范例</H2
><P
>&#13;   For a full discussion of the metadata, see the
   <A
HREF="ref.sdo.das.rel.html#sdo.das.rel.metadata"
>metadata</A
>
   section in the general information about the Relational DAS.
  </P
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