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I have a condition to implement like following. rs = st.executeQuery(selectSQL); output = rs.getString("column"); Since the column may be null in the database, the rs.getString() will throw a NullPointerException when the column is null.
The default for ResultSet.getInt when the field value is NULL is to return 0, which is also the default value for your iVal declaration. In which case your test is completely redundant. If you actually want to do something different if the field value is NULL, I suggest: int iVal = 0;
8 sty 2024 · In this quick tutorial, we’ll learn a few different ways to check if a given Integer instance’s value is null or zero. For simplicity, we’re going to use unit test assertions to verify if each approach works as expected.
The MySQL IFNULL() function lets you return an alternative value if an expression is NULL: SELECT ProductName, UnitPrice * (UnitsInStock + IFNULL(UnitsOnOrder, 0)) FROM Products;
14 lut 2012 · The basic difference is that 0 is about measurable quantity, while NULL is about existence. Being a quantity, 0 represents something, i.e. a quantity, that is 0, much like 0.000000001 represents a quantity (one that in problems of every day life is in fact indistinguishably close to 0).
15 lut 2024 · To handle null values in JDBC involves checking for null values in ResultSet. The ResultSet is one of the interfaces available in java.sql package for handling PreparedStatement results.
In SQL, the IS NOT NULL condition is used to select rows if the specified field is NOT NULL. It has the following syntax: SELECT column1, column2, ... FROM table WHERE column_name IS NOT NULL; Here, column1, column2, ... are the table columns. table is the table name from where we select the data.
