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trekmbikes
 Post subject: generated SQL runs fine but .get() returns null!
PostPosted: Sat May 07, 2005 6:27 am 
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Joined: Thu May 05, 2005 4:49 pm
Posts: 30
I'm having some query trouble. When I try to get(Doc.class,7), I get a null result back. Setting the log to debug verifies that there wasn't a result set. However when I run the generated SQL manually, I get the right row back. Ideas?

Hibernate version: 3.0.2

Mapping documents:
Code:
<class name="Item" table="items">
     
      <id name="id" type="long" unsaved-value="null">
         <generator class="native" />
      </id>
      <version name="version" />
      <property name="created" type="timestamp" />
     
      <property name="price" type="big_decimal" not-null="true" />
      <property name="salePrice" type="big_decimal" not-null="true" column="sale_price" />
      <property name="onSale" type="boolean" column="on_sale" />
     
      <joined-subclass name="od.domain.Doc" table="document_items">
         <key column="item_id" />
         <property name="name" />
         <property name="active" type="boolean" />
         <property name="abstractText" column="abstract_text" type="text" />
         <set name="categories" cascade="none" table="category_docs">
            <key column="doc_id" />
            <many-to-many column="category_id" class="od.domain.Category" />
         </set>
      </joined-subclass>


Full stack trace of any exception that occurs: get(Doc.class,id) returns null

Name and version of the database you are using: MySQL 4.1

The generated SQL (show_sql=true): select doc0_.item_id as id0_, doc0_1_.version as version1_0_, doc0_1_.created as created1_0_, doc0_1_.price as price1_0_, doc0_1_.sale_price as sale5_1_0_, doc0_1_.on_sale as on6_1_0_, doc0_.name as name3_0_, doc0_.active as active3_0_, doc0_.abstract_text as abstract4_3_0_ from document_items doc0_ inner join items doc0_1_ on doc0_.item_id=doc0_1_.id where doc0_.item_id=?

Debug level Hibernate log excerpt:
Code:
2005-05-07 04:09:16,031 DEBUG (DefaultLoadEventListener.java:185) - loading entity: [od.domain.Doc#7]
2005-05-07 04:09:16,031 DEBUG (DefaultLoadEventListener.java:331) - attempting to resolve: [od.domain.Doc#7]
2005-05-07 04:09:16,031 DEBUG (DefaultLoadEventListener.java:367) - object not resolved in any cache: [od.domain.Doc#7]
2005-05-07 04:09:16,031 DEBUG (BasicEntityPersister.java:2457) - Materializing entity: [od.domain.Doc#7]
2005-05-07 04:09:16,031 DEBUG (Loader.java:1302) - loading entity: [od.domain.Doc#7]
2005-05-07 04:09:16,046 DEBUG (AbstractBatcher.java:277) - about to open PreparedStatement (open PreparedStatements: 0, globally: 0)
2005-05-07 04:09:16,046 DEBUG (AbstractBatcher.java:422) - opening JDBC connection
2005-05-07 04:09:16,046 DEBUG (AbstractBatcher.java:311) - select doc0_.item_id as id0_, doc0_1_.version as version1_0_, doc0_1_.created as created1_0_, doc0_1_.price as price1_0_, doc0_1_.sale_price as sale5_1_0_, doc0_1_.on_sale as on6_1_0_, doc0_.name as name3_0_, doc0_.active as active3_0_, doc0_.abstract_text as abstract4_3_0_ from document_items doc0_ inner join items doc0_1_ on doc0_.item_id=doc0_1_.id where doc0_.item_id=?
2005-05-07 04:09:16,046 DEBUG (AbstractBatcher.java:365) - preparing statement
2005-05-07 04:09:16,046 DEBUG (NullableType.java:59) - binding '7' to parameter: 1
2005-05-07 04:09:16,046 DEBUG (AbstractBatcher.java:293) - about to open ResultSet (open ResultSets: 0, globally: 0)
2005-05-07 04:09:16,046 DEBUG (Loader.java:384) - processing result set
2005-05-07 04:09:16,046 DEBUG (Loader.java:408) - done processing result set (0 rows)
2005-05-07 04:09:16,046 DEBUG (AbstractBatcher.java:300) - about to close ResultSet (open ResultSets: 1, globally: 1)
2005-05-07 04:09:16,046 DEBUG (AbstractBatcher.java:285) - about to close PreparedStatement (open PreparedStatements: 1, globally: 1)
2005-05-07 04:09:16,046 DEBUG (AbstractBatcher.java:403) - closing statement
2005-05-07 04:09:16,046 DEBUG (Loader.java:504) - total objects hydrated: 0
2005-05-07 04:09:16,046 DEBUG (PersistenceContext.java:789) - initializing non-lazy collections
2005-05-07 04:09:16,046 DEBUG (Loader.java:1330) - done entity load
2005-05-07 04:09:16,062 DEBUG (SessionImpl.java:254) - closing session
2005-05-07 04:09:16,062 DEBUG (AbstractBatcher.java:437) - closing JDBC connection (open PreparedStatements: 0, globally: 0) (open ResultSets: 0, globally: 0)
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trekmbikes
 Post subject: More details - please help!
PostPosted: Sat May 07, 2005 5:10 pm 
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Joined: Thu May 05, 2005 4:49 pm
Posts: 30
I found out that when I run a query like "from Doc where id = 7", it works. When I run a query like "from Doc where id = ?" and pass 7 to the finder function, it breaks. Here's two log excerpts:

Code:
2005-05-07 15:01:54,968 DEBUG (SessionImpl.java:777) - find: from Doc where id = 7
2005-05-07 15:01:54,968 DEBUG (QueryParameters.java:220) - named parameters: {}
2005-05-07 15:01:54,968 DEBUG (QueryTranslatorImpl.java:207) - parse() - HQL: from od.domain.Doc where id = 7
2005-05-07 15:01:54,968 DEBUG (QueryTranslatorImpl.java:223) - --- HQL AST ---
\-[QUERY] 'query'
    +-[SELECT_FROM] 'SELECT_FROM'
    |  \-[FROM] 'from'
    |     \-[RANGE] 'RANGE'
    |        \-[DOT] '.'
    |           +-[DOT] '.'
    |           |  +-[IDENT] 'od'
    |           |  \-[IDENT] 'domain'
    |           \-[IDENT] 'Doc'
    \-[WHERE] 'where'
       \-[EQ] '='
          +-[IDENT] 'id'
          \-[NUM_INT] '7'

2005-05-07 15:01:54,968 DEBUG (ErrorCounter.java:72) - throwQueryException() : no errors
2005-05-07 15:01:54,968 DEBUG (HqlSqlBaseWalker.java:120) - query() << begin, level = 1
2005-05-07 15:01:54,968 DEBUG (FromElement.java:81) - FromClause{level=1} :  od.domain.Doc (no alias) -> doc0_
2005-05-07 15:01:54,968 DEBUG (FromReferenceNode.java:48) - Resolved :  id -> doc0_.item_id
2005-05-07 15:01:54,984 DEBUG (HqlSqlBaseWalker.java:125) - query() : finishing up , level = 1
2005-05-07 15:01:54,984 DEBUG (HqlSqlWalker.java:331) - processQuery() :  ( SELECT ( FromClause{level=1} document_items doc0_ ) ( where ( = doc0_.item_id 7 ) ) )
2005-05-07 15:01:54,984 DEBUG (HqlSqlWalker.java:451) - Derived SELECT clause created.
2005-05-07 15:01:54,984 DEBUG (JoinProcessor.java:112) - Using FROM fragment [document_items doc0_ inner join items doc0_1_ on doc0_.item_id=doc0_1_.id]
2005-05-07 15:01:54,984 DEBUG (HqlSqlBaseWalker.java:128) - query() >> end, level = 1
2005-05-07 15:01:54,984 DEBUG (QueryTranslatorImpl.java:193) - --- SQL AST ---
\-[SELECT] QueryNode: 'SELECT'  querySpaces (document_items,items)
    +-[SELECT_CLAUSE] SelectClause: '{derived select clause}'
    |  +-[SELECT_EXPR] SelectExpressionImpl: 'doc0_.item_id as id' {FromElement{explicit,not a collection join,not a fetch join,fetch non-lazy properties,classAlias=null,role=null,tableName=document_items,tableAlias=doc0_,colums={,className=od.domain.Doc}}}
    |  \-[SQL_TOKEN] SqlFragment: 'doc0_1_.version as version1_, doc0_1_.created as created1_, doc0_1_.price as price1_, doc0_1_.sale_price as sale5_1_, doc0_1_.on_sale as on6_1_, doc0_.name as name3_, doc0_.active as active3_, doc0_.abstract_text as abstract4_3_'
    +-[FROM] FromClause: 'from' FromClause{level=1, fromElementCounter=1, fromElements=1, fromElementByClassAlias=[], fromElementByTableAlias=[doc0_], fromElementsByPath=[], collectionJoinFromElementsByPath=[], impliedElements=[]}
    |  \-[FROM_FRAGMENT] FromElement: 'document_items doc0_ inner join items doc0_1_ on doc0_.item_id=doc0_1_.id' FromElement{explicit,not a collection join,not a fetch join,fetch non-lazy properties,classAlias=null,role=null,tableName=document_items,tableAlias=doc0_,colums={,className=od.domain.Doc}}
    \-[WHERE] SqlNode: 'where'
       \-[EQ] SqlNode: '='
          +-[SQL_TOKEN] IdentNode: 'doc0_.item_id' {originalText=id}
          \-[NUM_INT] LiteralNode: '7'

2005-05-07 15:01:54,984 DEBUG (ErrorCounter.java:72) - throwQueryException() : no errors
2005-05-07 15:01:54,984 DEBUG (QueryTranslatorImpl.java:177) - HQL: from od.domain.Doc where id = 7
2005-05-07 15:01:54,984 DEBUG (QueryTranslatorImpl.java:178) - SQL: select doc0_.item_id as id, doc0_1_.version as version1_, doc0_1_.created as created1_, doc0_1_.price as price1_, doc0_1_.sale_price as sale5_1_, doc0_1_.on_sale as on6_1_, doc0_.name as name3_, doc0_.active as active3_, doc0_.abstract_text as abstract4_3_ from document_items doc0_ inner join items doc0_1_ on doc0_.item_id=doc0_1_.id where doc0_.item_id=7
2005-05-07 15:01:55,077 DEBUG (AbstractBatcher.java:277) - about to open PreparedStatement (open PreparedStatements: 0, globally: 0)
2005-05-07 15:01:55,077 DEBUG (AbstractBatcher.java:311) - select doc0_.item_id as id, doc0_1_.version as version1_, doc0_1_.created as created1_, doc0_1_.price as price1_, doc0_1_.sale_price as sale5_1_, doc0_1_.on_sale as on6_1_, doc0_.name as name3_, doc0_.active as active3_, doc0_.abstract_text as abstract4_3_ from document_items doc0_ inner join items doc0_1_ on doc0_.item_id=doc0_1_.id where doc0_.item_id=7
2005-05-07 15:01:55,077 DEBUG (AbstractBatcher.java:365) - preparing statement
2005-05-07 15:01:55,077 DEBUG (AbstractBatcher.java:293) - about to open ResultSet (open ResultSets: 0, globally: 0)
2005-05-07 15:01:55,077 DEBUG (Loader.java:384) - processing result set
2005-05-07 15:01:55,093 DEBUG (Loader.java:389) - result set row: 0
2005-05-07 15:01:55,093 DEBUG (NullableType.java:86) - returning '7' as column: id
2005-05-07 15:01:55,093 DEBUG (Loader.java:791) - result row: EntityKey[od.domain.Doc#7]


versus

Code:
2005-05-07 15:01:55,109 DEBUG (SessionImpl.java:777) - find: from Doc where id = ?
2005-05-07 15:01:55,109 DEBUG (QueryParameters.java:217) - parameters: [7]
2005-05-07 15:01:55,109 DEBUG (QueryParameters.java:220) - named parameters: {}
2005-05-07 15:01:55,109 DEBUG (QueryTranslatorImpl.java:207) - parse() - HQL: from od.domain.Doc where id = ?
2005-05-07 15:01:55,124 DEBUG (QueryTranslatorImpl.java:223) - --- HQL AST ---
\-[QUERY] 'query'
    +-[SELECT_FROM] 'SELECT_FROM'
    |  \-[FROM] 'from'
    |     \-[RANGE] 'RANGE'
    |        \-[DOT] '.'
    |           +-[DOT] '.'
    |           |  +-[IDENT] 'od'
    |           |  \-[IDENT] 'domain'
    |           \-[IDENT] 'Doc'
    \-[WHERE] 'where'
       \-[EQ] '='
          +-[IDENT] 'id'
          \-[PARAM] '?'

2005-05-07 15:01:55,124 DEBUG (ErrorCounter.java:72) - throwQueryException() : no errors
2005-05-07 15:01:55,124 DEBUG (HqlSqlBaseWalker.java:120) - query() << begin, level = 1
2005-05-07 15:01:55,124 DEBUG (FromElement.java:81) - FromClause{level=1} :  od.domain.Doc (no alias) -> doc0_
2005-05-07 15:01:55,140 DEBUG (FromReferenceNode.java:48) - Resolved :  id -> doc0_.item_id
2005-05-07 15:01:55,140 DEBUG (HqlSqlBaseWalker.java:125) - query() : finishing up , level = 1
2005-05-07 15:01:55,140 DEBUG (HqlSqlWalker.java:331) - processQuery() :  ( SELECT ( FromClause{level=1} document_items doc0_ ) ( where ( = doc0_.item_id ? ) ) )
2005-05-07 15:01:55,140 DEBUG (HqlSqlWalker.java:451) - Derived SELECT clause created.
2005-05-07 15:01:55,140 DEBUG (JoinProcessor.java:112) - Using FROM fragment [document_items doc0_ inner join items doc0_1_ on doc0_.item_id=doc0_1_.id]
2005-05-07 15:01:55,140 DEBUG (HqlSqlBaseWalker.java:128) - query() >> end, level = 1
2005-05-07 15:01:55,140 DEBUG (QueryTranslatorImpl.java:193) - --- SQL AST ---
\-[SELECT] QueryNode: 'SELECT'  querySpaces (document_items,items)
    +-[SELECT_CLAUSE] SelectClause: '{derived select clause}'
    |  +-[SELECT_EXPR] SelectExpressionImpl: 'doc0_.item_id as id' {FromElement{explicit,not a collection join,not a fetch join,fetch non-lazy properties,classAlias=null,role=null,tableName=document_items,tableAlias=doc0_,colums={,className=od.domain.Doc}}}
    |  \-[SQL_TOKEN] SqlFragment: 'doc0_1_.version as version1_, doc0_1_.created as created1_, doc0_1_.price as price1_, doc0_1_.sale_price as sale5_1_, doc0_1_.on_sale as on6_1_, doc0_.name as name3_, doc0_.active as active3_, doc0_.abstract_text as abstract4_3_'
    +-[FROM] FromClause: 'from' FromClause{level=1, fromElementCounter=1, fromElements=1, fromElementByClassAlias=[], fromElementByTableAlias=[doc0_], fromElementsByPath=[], collectionJoinFromElementsByPath=[], impliedElements=[]}
    |  \-[FROM_FRAGMENT] FromElement: 'document_items doc0_ inner join items doc0_1_ on doc0_.item_id=doc0_1_.id' FromElement{explicit,not a collection join,not a fetch join,fetch non-lazy properties,classAlias=null,role=null,tableName=document_items,tableAlias=doc0_,colums={,className=od.domain.Doc}}
    \-[WHERE] SqlNode: 'where'
       \-[EQ] SqlNode: '='
          +-[SQL_TOKEN] IdentNode: 'doc0_.item_id' {originalText=id}
          \-[PARAM] SqlNode: '?'

2005-05-07 15:01:55,140 DEBUG (ErrorCounter.java:72) - throwQueryException() : no errors
2005-05-07 15:01:55,140 DEBUG (QueryTranslatorImpl.java:177) - HQL: from od.domain.Doc where id = ?
2005-05-07 15:01:55,140 DEBUG (QueryTranslatorImpl.java:178) - SQL: select doc0_.item_id as id, doc0_1_.version as version1_, doc0_1_.created as created1_, doc0_1_.price as price1_, doc0_1_.sale_price as sale5_1_, doc0_1_.on_sale as on6_1_, doc0_.name as name3_, doc0_.active as active3_, doc0_.abstract_text as abstract4_3_ from document_items doc0_ inner join items doc0_1_ on doc0_.item_id=doc0_1_.id where doc0_.item_id=?
2005-05-07 15:01:55,140 DEBUG (ErrorCounter.java:72) - throwQueryException() : no errors
2005-05-07 15:01:55,202 DEBUG (AbstractBatcher.java:277) - about to open PreparedStatement (open PreparedStatements: 0, globally: 0)
2005-05-07 15:01:55,202 DEBUG (AbstractBatcher.java:311) - select doc0_.item_id as id, doc0_1_.version as version1_, doc0_1_.created as created1_, doc0_1_.price as price1_, doc0_1_.sale_price as sale5_1_, doc0_1_.on_sale as on6_1_, doc0_.name as name3_, doc0_.active as active3_, doc0_.abstract_text as abstract4_3_ from document_items doc0_ inner join items doc0_1_ on doc0_.item_id=doc0_1_.id where doc0_.item_id=?
2005-05-07 15:01:55,202 DEBUG (AbstractBatcher.java:365) - preparing statement
2005-05-07 15:01:55,202 DEBUG (NullableType.java:59) - binding '7' to parameter: 1
2005-05-07 15:01:55,202 DEBUG (AbstractBatcher.java:293) - about to open ResultSet (open ResultSets: 0, globally: 0)
2005-05-07 15:01:55,202 DEBUG (Loader.java:384) - processing result set
2005-05-07 15:01:55,202 DEBUG (Loader.java:408) - done processing result set (0 rows)
2005-05-07 15:01:55,202 DEBUG (AbstractBatcher.java:300) - about to close ResultSet (open ResultSets: 1, globally: 1)
2005-05-07 15:01:55,202 DEBUG (AbstractBatcher.java:285) - about to close PreparedStatement (open PreparedStatements: 1, globally: 1)
2005-05-07 15:01:55,202 DEBUG (AbstractBatcher.java:403) - closing statement
2005-05-07 15:01:55,202 DEBUG (Loader.java:504) - total objects hydrated: 0


Could this be a problem with my database driver using PreparedStatements or something? I'm using MySQL version 4.1.11-nt and mysql-connector-java-3.1.8-bin.jar
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snpesnpe
 Post subject:
PostPosted: Sat May 07, 2005 6:34 pm 
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Joined: Sat Jun 12, 2004 4:49 pm
Posts: 915
I think that your Doc (id=7) haven't items and joined query doesn't work

try map like simple one-to-many (maybe bidirectional) or add any row with doc=7 in items

regards
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trekmbikes
 Post subject: err
PostPosted: Sat May 07, 2005 6:54 pm 
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Joined: Thu May 05, 2005 4:49 pm
Posts: 30
Hey snpesnpe,
Did you see my latest post? When I run "from Doc where id = 7", it works. Based on that, I think my joins are correct.
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snpesnpe
 Post subject:
PostPosted: Sat May 07, 2005 7:05 pm 
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Joined: Sat Jun 12, 2004 4:49 pm
Posts: 915
yes, I'm sorry.What is type in database for id ; it is type mismatch in mysql or jdbc driver fault

regrads
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trekmbikes
 Post subject: answer
PostPosted: Sat May 07, 2005 7:17 pm 
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Joined: Thu May 05, 2005 4:49 pm
Posts: 30
Thanks for your ideas, here's what I found out. I took Hibernate and Spring out of the equation and made a small JSP that tests out the driver / DB combo. I think there's a bug in the driver.

My JSP code:
Code:
<%
   Class.forName("com.mysql.jdbc.Driver");
   Connection con = DriverManager.getConnection(
      "jdbc:mysql://localhost/outsourcingdocs?autoReconnect=true&amp;useUnicode=true&amp;characterEncoding=utf8",
      "username","password");
   
   PreparedStatement stmt = con.prepareStatement("select doc0_.item_id as id, doc0_1_.version as version1_, " +
      "doc0_1_.created as created1_, doc0_1_.price as price1_, doc0_1_.sale_price as sale5_1_, " +
      "doc0_1_.on_sale as on6_1_, doc0_.name as name3_, doc0_.active as active3_, " +
      "doc0_.abstract_text as abstract4_3_" +
      " from document_items doc0_ inner join items doc0_1_ on doc0_.item_id=doc0_1_.id" +
      " where doc0_.item_id = ?");
   stmt.setLong(1,7);
   ResultSet rs = stmt.executeQuery();
   while (rs.next()) {%>
      Doc: <%=rs.getString("id")%> - <%=rs.getString("name3_")%>
<% }

   stmt = con.prepareStatement("select childcateg0_.parent_id as parent5___, childcateg0_.id as id__, " +
   "childcateg0_.id as id0_, childcateg0_.version as version13_0_, childcateg0_.created as created13_0_," +
   " childcateg0_.name as name13_0_, childcateg0_.parent_id as parent5_13_0_ from categories childcateg0_" +
   " where childcateg0_.parent_id = ?");
   stmt.setLong(1,3);
   rs = stmt.executeQuery();
   while (rs.next()) {%>
      Cat: <%=rs.getString("id__")%> - <%=rs.getString("name13_0_")%>
<% }
   stmt.close();
   con.close();
%>


Basically, I'm preparing two statement, each with one parameter. In both statements I set the parameter to a valid ID. The first one returns no rows, the second one returns two results.

If I change the queries to normal queries (by typing in the value of each parameter in the place of the "?"), the first query then returns one row.

I'm using Connector/J 3.1.8a and MySQL 4.1.11-nt-max
I tried the same code using Connector/J 3.2alpha, same results.

My workaround will be to append the following to the connection URL of my datasource:
"&useServerPrepStmts=false"
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snpesnpe
 Post subject:
PostPosted: Sat May 07, 2005 8:07 pm 
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Joined: Sat Jun 12, 2004 4:49 pm
Posts: 915
is item_id in table document_items type long ?
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trekmbikes
 Post subject: desc
PostPosted: Sat May 07, 2005 8:09 pm 
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Joined: Thu May 05, 2005 4:49 pm
Posts: 30
Code:
mysql> desc document_items;
+---------------+--------------+------+-----+---------+-------+
| Field         | Type         | Null | Key | Default | Extra |
+---------------+--------------+------+-----+---------+-------+
| item_id       | bigint(20)   |      | PRI | 0       |       |
| name          | varchar(255) | YES  |     | NULL    |       |
| active        | tinyint(1)   | YES  |     | NULL    |       |
| abstract_text | text         | YES  |     | NULL    |       |
+---------------+--------------+------+-----+---------+-------+
4 rows in set (0.00 sec)

mysql> desc items;
+------------+---------------+------+-----+---------+----------------+
| Field      | Type          | Null | Key | Default | Extra          |
+------------+---------------+------+-----+---------+----------------+
| id         | bigint(20)    |      | PRI | NULL    | auto_increment |
| version    | int(11)       |      |     | 0       |                |
| created    | datetime      | YES  |     | NULL    |                |
| price      | decimal(19,2) | YES  |     | NULL    |                |
| sale_price | decimal(19,2) | YES  |     | NULL    |                |
| on_sale    | tinyint(1)    | YES  |     | NULL    |                |
+------------+---------------+------+-----+---------+----------------+
6 rows in set (0.00 sec)
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snpesnpe
 Post subject:
PostPosted: Sat May 07, 2005 8:18 pm 
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Joined: Sat Jun 12, 2004 4:49 pm
Posts: 915
you can try map to BigInteger, but I think that is driver bug.Is there newer version ?
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