Issue with wildcards in Java prepared statements

Question

I currently confused at how to set wildcards for long values when using select in databases. Currently I have:

preparedstatement= conn.prepareStatement("SELECT * FROM database WHERE LONGVALUES LIKE ? ");

preparedstatement.setLong(1, aLongValue);

I am currently confused on how to use a wild card to get the results that I want. What I want to select is all values from that database whose LONGVALUES column contains the number aLongValue . So if 52 is in the database entering 5 or 2 would select it.

Answer 1

You can't do LIKE on a numerical value. It must be a string so you should either make LONGVALUES a VARCHAR field or use a scalar function to convert the value to a string in line with your query ie

SELECT * FROM database WHERE TO_CHAR(LONGVALUES) LIKE ?;

Answer 2

要使用LIKE，您的aLongValue应该是varchar，那么您可以运行...，其中longvalue类似于'％5％'