下面是JDBC程序的部分代码片段：
| | |
| ---- | ------------------------------------------------------------ |
| | conn = DriverManager.getConnection("jdbc:mysql:///student", "root", "root"); stmt = conn.createStatement(); String sql = "insert into student values (null,'张三',21)"; int affectCount = stmt.executeUpdate(sql); |
代码执行成功后 affectCount 的值为
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