What Is the Correct Syntax?
I am searching a database, order the search result by some criterion supplied by users and ASC/DESC is also supplied by user's selection. How do I write the query statement?
public Collection getBeans( String memberName, String sortCriterion, String order )
throws IllegalArgumentException, DatabaseException, BadInputException
String query = "SELECT thread_id, message_receiver, message_sender, article_title FROM message_thread WHERE message_receiver = '" + memberName + "' ORDER BY + '" sortCriterion + '" + " " + '"order + "'";
My question is about the syntax of building up the query string.
Here is the entire code:
public Collection getThreadBeans_forReceiver_withSortSupport_limit_mysql( String memberName, int offset, int rowsToReturn, String sort, String order )
throws IllegalArgumentException, DatabaseException, BadInputException
if ( offset < 0 ) throw new IllegalArgumentException( "The offset < 0 is not allowed." );
if ( rowsToReturn <= 0 ) throw new IllegalArgumentException( "The rowsToReturn <= 0 is not allowed." );
if ( ( !sort.equals( "thread_last_post_date" ) ) &&
( !sort.equals( "thread_creation_date" ) ) &&
( !sort.equals( "message_sender" ) ) &&
( !sort.equals( "thread_reply_count" ) ) &&
( !sort.equals( "thread_view_count" ) ) )
throw new BadInputException( "Cannot sort, reason: dont understand the criteria '" + sort + "'." );
if ( ( !order.equals( "ASC" ) ) &&
( !order.equals( "DESC" ) ) )
throw new BadInputException( "Cannot sort, reason: dont understand the order '" + order + "'." );
Connection conn = null;
PreparedStatement stmt = null;
ResultSet rs = null;
Collection retValue = new ArrayList();
String query = "SELECT thread_id, message_receiver, message_sender, article_title, last_post_member_name, thread_topic, thread_body, thread_creation_date, thread_last_post_date, thread_type, thread_option, thread_status, thread_view_count, thread_reply_count, thread_duration FROM message_thread WHERE message_receiver = '" + memberName + "' ORDER BY " + sort + " " + order;
try
conn = DBConnection.getDBConnection();
stmt = conn.prepareStatement( query );
stmt.setString( 1, memberName );
stmt.setInt( 2, offset );
stmt.setInt( 3, rowsToReturn );
rs = stmt.executeQuery();
while ( rs.next() )
ThreadBean bean = new ThreadBean();
bean.setThreadID( rs.getInt( "thread_id" ) );
bean.setReceiver( rs.getString( "message_receiver" ) );
bean.setSender( rs.getString( "message_sender" );
bean.setTitle( rs.getString( "article_title" );
bean.setLastPostMemberName( rs.getString( "last_post_member_name" ) );
bean.setPostTopic( rs.getString( "thread_topic" ) );
bean.setPostBody( rs.getString( "thread_body" ) );
bean.setThreadCreationDate( rs.getTimestamp( "thread_creation_date" ) );
bean.setThreadLastPostDate( rs.getTimestamp( "thread_last_post_date" ) );
bean.setThreadType( rs.getInt( "thread_type" ) );
bean.setThreadOption( rs.getInt( "thread_option" ) );
bean.setThreadStatus( rs.getInt( "thread_status" ) );
bean.setThreadViewCount( rs.getInt( "thread_view_count" ) );
bean.setThreadReplyCount( rs.getInt( "thread_reply_count" ) );
bean.setThreadDuration( rs.getInt( "thread_duration" ) );
retValue.add( bean );
return retValue;
catch( SQLException sqle )
sqle.printStackTrace();
throw new DatabaseException( "Error executing SQL in ListThreadHandler.getBeans_inForum_withSortSupport_limit_mysql." );
finally
if ( conn != null )
try
stmt.close();
stmt = null;
conn.close();
catch( SQLException sqlEx )
System.out.println( "Problem occurs while closing " + sqlEx );
conn = null;
}
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