A simple example of a SQL injection解决方案

A simple example of a SQL injection
HttpServletRequest request = ...;
String userName = request.getParameter("name");
Connection con = ...
String query = "SELECT * FROM Users " +
" WHERE name = ’" + userName + "’";
con.execute(query);

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???
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exec store proc
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java ,用 PreparedStatement 这个对象
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不要这样写，最容易被攻击。