Getting the JDBC column types

Question

I need to ask about my column jdbc type in a table, today I am looping throw my columns and then asking about its type, see my code below :

public int getColumnDataTypeFromDB(String columnName) {
    int datatype = 0;

    ResultSet columns = null;
    try {
        String schema =
            getMetaDataCatalogName() != null
                ? getMetaDataCatalogName()
                : getMetaDataSchemaName();

        if (TableManagerFactory.isCatalogBasedDatabase()) {
            columns =
                getMetaData().getColumns(
                    schema,
                    null,
                    tableName,
                    columnName);
        } else {
            columns =
                getMetaData().getColumns(
                    null,
                    schema,
                    tableName,
                    columnName);
        }
        //          columns =
        //              getMetaData().getColumns(getMetaDataCatalogName(), getMetaDataSchemaName(), tableName, columnName);
        if (columns.next()) {
            datatype = columns.getInt("DATA_TYPE");
        }
    } catch (SQLException ex) {
        Log.error(
            this,
            "Error while getting columns information: " + ex.getMessage(),
            ex);
        //return false;
    } catch (DDLCreationException ex) {
        Log.error(this, ex.getMessage());
    } finally {
        try {
            if (columns != null) {
                columns.close();
            }
        } catch (SQLException ex) {
        Log.error(this, ex.getLocalizedMessage());
        }
    }

    return datatype;
}

Can I get all the columns metadata in such a table at the same time ? if yes, how can I do it ??

Answer 1

Use jdbc ResultSetMetaData class to get the detail information of the table columns.

 ResultSet res=stmt.executeQuery("select * from tableName where 1<0");
 ResultSetMetaData rsmd=res.getMetaData();
 rsmd.getColumnType(1);
 rsmd.getColumnLabel(1);
 rsmd.getColumnDisplaySize(1);