GetColumns returns 0 as datatype for some datatypes, different from mysql driver.

[templefox]

change jdbc.CommonDatabaseMetaData.dataTypeClause:
protected final String dataTypeClause =
" CASE data_type" +
" WHEN 'int' THEN " + Types.INTEGER +
" WHEN 'mediumint' THEN "+Types.INTEGER +
" WHEN 'varchar' THEN " + Types.VARCHAR +
" WHEN 'datetime' THEN " + Types.TIMESTAMP +
" WHEN 'date' THEN " + Types.DATE +
" WHEN 'time' THEN " + Types.TIME +
" WHEN 'text' THEN " + Types.VARCHAR +
" WHEN 'bigint' THEN " + Types.BIGINT +
" WHEN 'varbinary' THEN " + Types.VARBINARY +
" WHEN 'timestamp' THEN " + Types.TIMESTAMP +
" WHEN 'double' THEN " + Types.DOUBLE +
" WHEN 'bit' THEN " + Types.BIT +

" WHEN 'tinyint' THEN " + Types.TINYINT + <<<<<<
" WHEN 'char' THEN " + Types.CHAR+ <<<<<<
" END";