jdbc 获取mysql表注解,使用DatabaseMetaData检索mysql表注释

So I'm using Vaadin Java web framework for a project which requires the ability to edit the table. Vaadin provides a way to get Connection object from SimpleJDBCConnectionPool (Here's the API)

From the Connection I can get DatabaseMetaData object. And I have the following code:

private List getTableNames(DatabaseMetaData md) throws SQLException {

ArrayList tables = new ArrayList();

ResultSet rs = md.getTables(null, null, "", null);

while (rs.next()) {

tables.add(rs.getString("TABLE_NAME")); //Column 3 is for table name

Logger.getLogger(CodeContainingClass.class.getName()).

info("Comment: " + rs.getString("REMARKS")); //Column 5 is for remarks

}

return tables;

}

It retrieves the Table name correctly, but unfortunately the REMARKS returns null. (Here's the API). I'm not sure what I'm doing wrong.

I verified that the table has a comment using the following query:

SHOW TABLE STATUS WHERE Name='tablename';

Any help will be greatly appreciated. Thank you very much.

解决方案

See this MySQL Connector/J bug (specifically the comment at 27 Jun 2012 11:26 and 28 Jun 2012 11:18). You need to specify connection property useInformationSchema=true to get this functionality.