op = op.toString();
ResultSet rs = stmt.executeQuery("SELECT * FROM A WHERE TB = '"+op+"'");
提示op cannot be resolved 错误
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js var cannot be resolved
在jsp中,在select onchange事件中,获得选择的内容 var op = opSet.options[opSet.selectedIndex].text; 然后在下面想用这个op作为条件去查询数据库 op = op.toString(); ResultSet rs = stmt.executeQuery("SELECT * FROM A WHERE TB = '"+op+"'"); 提示op cannot be resolved 错误