如何在Java中使用mysql存储过程进行动态修饰？

Question

there are three fixed arguments in this little Java project, and the first two arguments are all fixed arguments. And I want to know, if there is a way to use stored procedure with the arguments that is not fixed in the project. For example I want to execute the procedure with arguement v1, and I think I might use "CallableStatement cstmt = conn.prepareCall("{call proc_2(v1,'b',?)}"); But obviously it's wrong. So my problem is how the sql sentence can get the varibale from java?

Answer 1

You can use question marks as placeholders for dynamic arguments too. For example:

CallableStatement cstmt = conn.prepareCall("{call proc_2('a', ?, ?)}");
cstmt.setString(1, aString);
cstmt.registerOutParameter(2, java.sql.Types.VARCHAR);
boolean i = cstmt.execute();