一个坑：java.sql.ResultSet.getInt==》the column value; if the value is SQL NULL, the value returned is 0

Retrieves the value of the designated column in the current row of this ResultSet object as a String in the Java programming language.

Parameters:

columnLabel the label for the column specified with the SQL AS clause. If the SQL AS clause was not specified, then the label is the name of the column

Returns:

the column value; if the value is SQL NULL, the value returned is null

Throws:

- if the columnLabel is not valid; if a database access error occurs or this method is called on a closed result set

 

int ...getInt( columnLabel) throws

Retrieves the value of the designated column in the current row of this ResultSet object as an int in the Java programming language.

Parameters:

columnLabel the label for the column specified with the SQL AS clause. If the SQL AS clause was not specified, then the label is the name of the column

Returns:

the column value; if the value is SQL NULL, the value returned is 0

Throws: