dbcolumn.html

Medi 这是一个基于Java的媒体文件归档器工具

<A NAME="DbColumn(javatools.db.DbAbstractTable, int)"><!-- --></A><H3>
DbColumn</H3>
<PRE>
public <B>DbColumn</B>(<A HREF="../../javatools/db/DbAbstractTable.html">DbAbstractTable</A>&nbsp;table,
                int&nbsp;index)</PRE>
<DL>
<DD>Creates a new DbColumn.
<P>
<DT><B>Parameters:</B><DD><CODE>table</CODE> - The table to get the column from.<DD><CODE>index</CODE> - The position of table's field.</DL>

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<B>Method Detail</B></FONT></TD>
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<A NAME="getQueryString()"><!-- --></A><H3>
getQueryString</H3>
<PRE>
public java.lang.String <B>getQueryString</B>()</PRE>
<DL>
<DD>Returns the query string related to this column.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../javatools/db/DbExpr.html#getQueryString()">getQueryString</A></CODE> in class <CODE><A HREF="../../javatools/db/DbExpr.html">DbExpr</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>The needed string.</DL>
</DD>
</DL>
<HR>

<A NAME="getName()"><!-- --></A><H3>
getName</H3>
<PRE>
public java.lang.String <B>getName</B>()</PRE>
<DL>
<DD>Returns the column name.
<P>
<DD><DL>

<DT><B>Returns:</B><DD>The name of this column.</DL>
</DD>
</DL>
<HR>

<A NAME="setSqlValues(java.sql.PreparedStatement, int)"><!-- --></A><H3>
setSqlValues</H3>
<PRE>
public int <B>setSqlValues</B>(java.sql.PreparedStatement&nbsp;ps,
                        int&nbsp;i)
                 throws <A HREF="../../javatools/db/DbException.html">DbException</A></PRE>
<DL>
<DD>Sets, in a prepared statement, the value related to this column, that will be
 used, e.g., in an INSERT operation. Anyway it is obscure...
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../javatools/db/DbExpr.html#setSqlValues(java.sql.PreparedStatement, int)">setSqlValues</A></CODE> in class <CODE><A HREF="../../javatools/db/DbExpr.html">DbExpr</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>ps</CODE> - The prepared statement.<DD><CODE>i</CODE> - The index.
<DT><B>Returns:</B><DD>An index.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../javatools/db/DbException.html">DbException</A></CODE> - If something goes wrong.</DL>
</DD>
</DL>
<HR>

<A NAME="getSize()"><!-- --></A><H3>
getSize</H3>
<PRE>
public int <B>getSize</B>()</PRE>
<DL>
<DD>Returns the display size of this column.
<P>
<DD><DL>

<DT><B>Returns:</B><DD>The needed display size of the column.</DL>
</DD>
</DL>
<HR>

<A NAME="getIndex()"><!-- --></A><H3>
getIndex</H3>
<PRE>
public int <B>getIndex</B>()</PRE>
<DL>
<DD>Returns the index of the column among the fields of the table.
<P>
<DD><DL>

<DT><B>Returns:</B><DD>The index of the column.</DL>
</DD>
</DL>
<HR>

<A NAME="equals(java.lang.Object)"><!-- --></A><H3>
equals</H3>
<PRE>
public boolean <B>equals</B>(java.lang.Object&nbsp;o)</PRE>
<DL>
<DD>Checks if a column equals another column.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE>equals</CODE> in class <CODE>java.lang.Object</CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>o</CODE> - The object to compare to.
<DT><B>Returns:</B><DD><CODE>true</CODE>: if it is equal;
 <CODE>false</CODE>: otherwise.</DL>
</DD>
</DL>
<HR>

<A NAME="toString()"><!-- --></A><H3>
toString</H3>
<PRE>
public java.lang.String <B>toString</B>()</PRE>
<DL>
<DD>The fully qualified name of this column.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE>toString</CODE> in class <CODE>java.lang.Object</CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>The name of the column.</DL>
</DD>
</DL>
<HR>

<A NAME="usesTables(java.util.Set)"><!-- --></A><H3>
usesTables</H3>
<PRE>
public void <B>usesTables</B>(java.util.Set&nbsp;c)</PRE>
<DL>
<DD>Adds to the set, the currently indexed table.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../javatools/db/DbTableUser.html#usesTables(java.util.Set)">usesTables</A></CODE> in interface <CODE><A HREF="../../javatools/db/DbTableUser.html">DbTableUser</A></CODE><DT><B>Overrides:</B><DD><CODE><A HREF="../../javatools/db/DbExpr.html#usesTables(java.util.Set)">usesTables</A></CODE> in class <CODE><A HREF="../../javatools/db/DbExpr.html">DbExpr</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>c</CODE> - The set to add current column to.</DL>
</DD>
</DL>
<HR>

<A NAME="getSubExpr(javatools.db.DbColumn[])"><!-- --></A><H3>
getSubExpr</H3>
<PRE>
public <A HREF="../../javatools/db/DbExpr.html">DbExpr</A> <B>getSubExpr</B>(<A HREF="../../javatools/db/DbColumn.html">DbColumn</A>[]&nbsp;cols)
                  throws <A HREF="../../javatools/db/DbException.html">DbException</A></PRE>
<DL>
<DD>Currently unused. It should take a sub-expression containing the specified
 columns.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>cols</CODE> - An array of columns. Only specified columns are taken in the result.
<DT><B>Returns:</B><DD>The column itself if it is in the list, <CODE>null</CODE> otherwise.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../javatools/db/DbException.html">DbException</A></CODE> - If something goes wrong.</DL>
</DD>
</DL>
<HR>

<A NAME="substituteColumn(javatools.db.DbColumn, javatools.db.DbColumn)"><!-- --></A><H3>
substituteColumn</H3>
<PRE>
public <A HREF="../../javatools/db/DbExpr.html">DbExpr</A> <B>substituteColumn</B>(<A HREF="../../javatools/db/DbColumn.html">DbColumn</A>&nbsp;oldCol,
                               <A HREF="../../javatools/db/DbColumn.html">DbColumn</A>&nbsp;newCol)
                        throws <A HREF="../../javatools/db/DbException.html">DbException</A></PRE>
<DL>
<DD>Currently unused. It should replace <CODE>oldCol</CODE> with
 <CODE>newCol</CODE>.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>oldCol</CODE> - The column to be replaced.<DD><CODE>newCol</CODE> - The column to put.
<DT><B>Returns:</B><DD><CODE>newCol</CODE> if this column represents <CODE>oldCol</CODE>, this column
 otherwise.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../javatools/db/DbException.html">DbException</A></CODE> - If something goes wrong.</DL>
</DD>
</DL>
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