Hi,
I use this JDBC Driver :
JDBC driver build number : 8.1.407-JDBC3
Server version : test do on 8.0.3 (linux), 8.1.3 (linux) and 8.1.2 (windows)
I have problem with the method getColumnDisplaySize in ResultSetMetaData
class.
I have this java program:
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;
public class Test {
public static void main(String[] args) {
try {
Properties props = new Properties();
Statement stmt = null;
Class.forName("org.postgresql.Driver");
props.put("user","xxxxx");
props.put("password","xxxxx");
Connection conn =
DriverManager.getConnection("jdbc:postgresql://myhost/mydatabase",
props);
try {
String SQLselect = "SELECT col1, cast(' ' as varchar(3)) as mycol
FROM mytable";
stmt = conn.createStatement();
ResultSet res = stmt.executeQuery(SQLselect);
ResultSetMetaData resMD = res.getMetaData();
System.out.println(resMD.getColumnDisplaySize(2));
res.close();
stmt.close();
} catch ( Exception e ) {
System.out.println("Error 1 : " + e.getMessage());
e.printStackTrace();
}
finally {
conn.close();
}
} catch ( Exception e) {
System.out.println("Error 2 : " + e.getMessage());
e.printStackTrace();
}
}
}
When i connect to 8.0.3 database the methode getColumnDisplaySize return 3,
a good value
When i connect to 8.1.2 or 8.1.3 database the methode getColumnDisplaySize
return -5, a bad value.
I saw the source of the JDBC Driver and i saw the difference is in data read
on socket in the method receiveFields in QueryExecutorImpl class.
When i connect to 8.0.3 database, on this line of the method :
...
int typeModifier = pgStream.ReceiveIntegerR(4);
...
typeModifier is set to 7.
When i conenct to 8.1.2 or 8.1.3, typeModifier is set to -1
Is it normal ? Someone can explain this ?
Regards,
5 messages in org.postgresql.pgsql-jdbcDiffrence between 8.0.3 and 8.1.3
