Re: Reading schema information

Mansour Al Akeel wrote:
> Sorry for missing the email subject in my previous email !
>
> I am trying to get some information about a coloum using the method:
>
>   DatabaseMetaData.getString("IS_GENERATEDCOLUMN")
>
> However it is throwing an exception:
>
> org.postgresql.util.PSQLException: The column name IS_GENERATEDCOLUMN
> was not found in this ResultSet.
>
> Based on javadoc for getColumns method:
>
>
http://docs.oracle.com/javase/7/docs/api/java/sql/DatabaseMetaData.html#getColumns(java.lang.String,%20java.lang.String,%20java.lang.String,%20java.lang.String)
>
>
> We have:
>
> IS_GENERATEDCOLUMN String => Indicates whether this is a generated column
>
> YES --- if this a generated column
> NO --- if this not a generated column
> empty string --- if it cannot be determined whether this is a generated column
>
>
> My questions is, is this a bug ? if not, how can I obtain this
> information about a column (if it's generated or not) ?
>
>
> Thank you.
>

Hello,

Try the following attached code, may have some syntax errors.

A complete example of collecting database and table meta
data my be obtained from my project on GoogleCode.

danap.

http://code.google.com/p/myjsqlview/

http://code.google.com/p/myjsqlview/source/browse/trunk/myjsqlview/src/com/dandymadeproductions/myjsqlview/datasource/DatabaseProperties.java

http://code.google.com/p/myjsqlview/source/browse/trunk/myjsqlview/src/com/dandymadeproductions/myjsqlview/gui/panels/TableTabPanel_PostgreSQL.java

************************
Statement sqlStatement = dbConnection.createStatement();
String sqlStatementString = "SELECT * FROM " + "myTable" + " LIMIT 1";

ResultSet db_resultSet = sqlStatement.executeQuery(sqlStatementString);

DatabaseMetaData dbMetaData = dbConnection.getMetaData();
ResultSetMetaData tableMetaData = db_resultSet.getMetaData();

ResultSet rs1 = dbMetaData.getColumns("myDatabase",
                                       tableMetaData.getCatalogName(1),
                                       tableMetaData.getSchemaName(1),
                                       tableMetaData.getTableName(1));
String isGenerated = rs1.getString("IS_GENERATEDCOLUMN");