[
https://issues.apache.org/jira/browse/DERBY-6728?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Johannes Lichtenberger updated DERBY-6728:
------------------------------------------
Description:
In the Java-Code below the reading from a CLOB-column fails. In no other tested
relational database it seems to fail (PostgreSQL / DB2 / MSSQL). It somehow
seems to be related to reading the maximum integer primary key value beforehand.
import java.sql.Clob;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Statement;
public class DerbyClobTest
{
public static void main(String[] args)
{
try
{
Connection conn = DriverManager
.getConnection("jdbc:derby://localhost:1527/ixixtsumImport;user=derby;password=derby");
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery("SELECT * FROM APP");
while (rs.next())
{
PreparedStatement l_stmt = null;
int l_iMaxLid = -1;
try
{
l_stmt = conn.prepareStatement("SELECT
MAX(LID) FROM APP");
ResultSet l_rs = l_stmt.executeQuery();
try
{
if (l_rs.next())
l_iMaxLid =
l_rs.getInt(1);
}
finally
{
l_rs.close();
l_rs = null;
}
}
finally
{
l_stmt.close();
l_stmt = null;
}
PreparedStatement stmtNew = conn
.prepareStatement("INSERT INTO
APP(LID, TXTBODY) VALUES(?, ?)");
stmtNew.setInt(1, l_iMaxLid);
final Clob clob = rs.getClob("TXTBODY");
if (clob == null)
return;
final String str = clob.getSubString(1, (int)
clob.length());
// Do something with str.
stmtNew.setClob(2, clob);
stmtNew.executeUpdate();
stmtNew.close();
}
}
catch (Exception except)
{
except.printStackTrace();
}
}
}
was:
In the Java-Code below the reading from a CLOB-column fails. In no other tested
relational database it seems to fail (PostgreSQL / DB2 / MSSQL). It somehow
seems to be related to reading the maximum integer primary key value beforehand.
import java.sql.Clob;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Statement;
import de.uplanet.util.Safely;
public class DerbyClobTest
{
public static void main(String[] args)
{
try
{
Connection conn = DriverManager
.getConnection("jdbc:derby://localhost:1527/ixixtsumImport;user=derby;password=derby");
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery("SELECT * FROM
XCAL3FD1DDEA");
while (rs.next())
{
PreparedStatement l_stmt = null;
int l_iMaxLid = -1;
try
{
l_stmt = conn.prepareStatement("SELECT
MAX(LID) FROM XCAL3FD1DDEA");
ResultSet l_rs = l_stmt.executeQuery();
try
{
if (l_rs.next())
l_iMaxLid =
l_rs.getInt(1);
}
finally
{
l_rs.close();
l_rs = null;
}
}
finally
{
l_stmt.close();
l_stmt = null;
}
PreparedStatement stmtNew = conn
.prepareStatement("INSERT INTO
XCAL3FD1DDEA (LID, TXTBODY) VALUES(?, ?)");
stmtNew.setInt(1, l_iMaxLid);
final Clob clob = rs.getClob("TXTBODY");
if (clob == null)
return;
final String str = clob.getSubString(1, (int)
clob.length());
// Do something with str.
stmtNew.setClob(2, clob);
stmtNew.executeUpdate();
stmtNew.close();
}
}
catch (Exception except)
{
except.printStackTrace();
}
}
}
> Reading from a Clob fails.
> --------------------------
>
> Key: DERBY-6728
> URL: https://issues.apache.org/jira/browse/DERBY-6728
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.11.1.1
> Reporter: Johannes Lichtenberger
>
> In the Java-Code below the reading from a CLOB-column fails. In no other
> tested relational database it seems to fail (PostgreSQL / DB2 / MSSQL). It
> somehow seems to be related to reading the maximum integer primary key value
> beforehand.
> import java.sql.Clob;
> import java.sql.Connection;
> import java.sql.DriverManager;
> import java.sql.PreparedStatement;
> import java.sql.ResultSet;
> import java.sql.Statement;
> public class DerbyClobTest
> {
> public static void main(String[] args)
> {
> try
> {
> Connection conn = DriverManager
>
> .getConnection("jdbc:derby://localhost:1527/ixixtsumImport;user=derby;password=derby");
> Statement stmt = conn.createStatement();
> ResultSet rs = stmt.executeQuery("SELECT * FROM APP");
> while (rs.next())
> {
> PreparedStatement l_stmt = null;
> int l_iMaxLid = -1;
> try
> {
> l_stmt = conn.prepareStatement("SELECT
> MAX(LID) FROM APP");
> ResultSet l_rs = l_stmt.executeQuery();
> try
> {
> if (l_rs.next())
> l_iMaxLid =
> l_rs.getInt(1);
> }
> finally
> {
> l_rs.close();
> l_rs = null;
> }
> }
> finally
> {
> l_stmt.close();
> l_stmt = null;
> }
> PreparedStatement stmtNew = conn
> .prepareStatement("INSERT INTO
> APP(LID, TXTBODY) VALUES(?, ?)");
> stmtNew.setInt(1, l_iMaxLid);
> final Clob clob = rs.getClob("TXTBODY");
> if (clob == null)
> return;
> final String str = clob.getSubString(1, (int)
> clob.length());
> // Do something with str.
> stmtNew.setClob(2, clob);
> stmtNew.executeUpdate();
> stmtNew.close();
> }
> }
> catch (Exception except)
> {
> except.printStackTrace();
> }
> }
> }
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