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The Java Developers Almanac 1.4Order this book from Amazon. |
e253. Determining If a Fetched Value Is NULLWhen aResultSet.getXXX() method encounters a NULL in the
database, it will convert it to a default value. For example, if NULL
was encountered in a NUMBER field, ResultSet.getInt() will return
0. In order to determine whether or not the actual value is a NULL,
wasNull() must be called. This method must be called immediately
after the value is fetched from the result set.
// Fetch each row from the result set while (resultSet.next()) {
e252. Getting Data from a Result Set e254. Getting the Column Names in a Result Set e255. Getting the Number of Rows in a Database Table e256. Getting BLOB Data from a Database Table e257. Matching with Wildcards in a SQL Statement © 2002 Addison-Wesley. |