fidmapper.html

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<B>Method Detail</B></FONT></TD>
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<A NAME="initSupportStructures()"><!-- --></A><H3>
initSupportStructures</H3>
<PRE>
public void <B>initSupportStructures</B>()</PRE>
<DL>
<DD>This method will be called by JDBCDataStore when creating new tables to
 give the FID mapper an opportunity to initialize needed data
 structures, such as support tables, sequences, and so on.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="getID(java.lang.Object[])"><!-- --></A><H3>
getID</H3>
<PRE>
public <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A> <B>getID</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A>[]&nbsp;attributes)</PRE>
<DL>
<DD>Returns the FID given the values of the prymary key attributes
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>attributes</CODE> - DOCUMENT ME!</DL>
</DD>
</DL>
<HR>

<A NAME="getPKAttributes(java.lang.String)"><!-- --></A><H3>
getPKAttributes</H3>
<PRE>
public <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A>[] <B>getPKAttributes</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A>&nbsp;FID)
                         throws <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></PRE>
<DL>
<DD>Creates the value for the PK attributes given the feature. If the FID is
 null, will throw an IOException if not possible. If null is returned,
 no primary key value needs to be specified, which is what we want for
 auto-increment fields.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>FID</CODE> - The feature ID is going to be parsed
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></CODE></DL>
</DD>
</DL>
<HR>

<A NAME="createID(java.sql.Connection, org.geotools.feature.Feature, java.sql.Statement)"><!-- --></A><H3>
createID</H3>
<PRE>
public <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A> <B>createID</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/sql/Connection.html" title="class or interface in java.sql">Connection</A>&nbsp;conn,
                       <A HREF="../../../../../org/geotools/feature/Feature.html" title="interface in org.geotools.feature">Feature</A>&nbsp;feature,
                       <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/sql/Statement.html" title="class or interface in java.sql">Statement</A>&nbsp;statement)
                throws <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></PRE>
<DL>
<DD>Creates a new ID for a feature. <br>
 This is done either by querying the database (for auto-increment like
 types, for example sequences) or by inspecting the Feature (for
 example, for primary keys with business meaning that whose attributes
 are included in the Feature ones).
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>conn</CODE> - - the database connection<DD><CODE>feature</CODE> - - the feature that needs the new FID<DD><CODE>statement</CODE> - - the statement used to insert the feature into the
        database
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></CODE></DL>
</DD>
</DL>
<HR>

<A NAME="returnFIDColumnsAsAttributes()"><!-- --></A><H3>
returnFIDColumnsAsAttributes</H3>
<PRE>
public boolean <B>returnFIDColumnsAsAttributes</B>()</PRE>
<DL>
<DD>If true the primary key columns will be returned as attributes. This is
 fundamental for primary key with businnes meaning.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="getColumnCount()"><!-- --></A><H3>
getColumnCount</H3>
<PRE>
public int <B>getColumnCount</B>()</PRE>
<DL>
<DD>Returns the number of columns in the primary keys handled by this mapper
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="getColumnName(int)"><!-- --></A><H3>
getColumnName</H3>
<PRE>
public <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A> <B>getColumnName</B>(int&nbsp;colIndex)</PRE>
<DL>
<DD>Returns the name of the specified column in the primary key
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>colIndex</CODE> - </DL>
</DD>
</DL>
<HR>

<A NAME="getColumnType(int)"><!-- --></A><H3>
getColumnType</H3>
<PRE>
public int <B>getColumnType</B>(int&nbsp;colIndex)</PRE>
<DL>
<DD>Returns the column type by using a constant available in the
 java.sql.Types interface
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>colIndex</CODE> - </DL>
</DD>
</DL>
<HR>

<A NAME="getColumnSize(int)"><!-- --></A><H3>
getColumnSize</H3>
<PRE>
public int <B>getColumnSize</B>(int&nbsp;colIndex)</PRE>
<DL>
<DD>Returns the size of a primary key column as it would be provided by the
 database metadata. Some fields requires a size specification, such as
 VARCHAR or NUMBER, whilst other don't have or don't need it (for
 example, an INTEGER or a TEXT field).
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>colIndex</CODE> - </DL>
</DD>
</DL>
<HR>

<A NAME="getColumnDecimalDigits(int)"><!-- --></A><H3>
getColumnDecimalDigits</H3>
<PRE>
public int <B>getColumnDecimalDigits</B>(int&nbsp;colIndex)</PRE>
<DL>
<DD>Provides the number of decimal digits for this column. This is relevant
 in particular when the column is a scaled integer such as a NUMBER
 column
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>colIndex</CODE> - </DL>
</DD>
</DL>
<HR>

<A NAME="isAutoIncrement(int)"><!-- --></A><H3>
isAutoIncrement</H3>
<PRE>
public boolean <B>isAutoIncrement</B>(int&nbsp;colIndex)</PRE>
<DL>
<DD>Returns true if the column is of serial type, that is, its value is
 automatically generated by the database if the user does not provide
 one
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>colIndex</CODE> - </DL>
</DD>
</DL>
<HR>

<A NAME="hasAutoIncrementColumns()"><!-- --></A><H3>
hasAutoIncrementColumns</H3>
<PRE>
public boolean <B>hasAutoIncrementColumns</B>()</PRE>
<DL>
<DD>Returns true if at least one column is of auto-increment type
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="isVolatile()"><!-- --></A><H3>
isVolatile</H3>
<PRE>
public boolean <B>isVolatile</B>()</PRE>
<DL>
<DD>Returns true it the FID generated by this mapper are volatile, that is,
 if asking twice for the same Feature will not provide the same FID.
 
 <p>
 This is usually true for mappers that try to generate a FID for tables
 without primary keys.
 </p>
 
 <p>
 When this method returns true, it's up to the datastore to decide what
 to do, but a sane policy may be to prevent Feature writing
 </p>
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
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