One warning: unless you integrate your reading of graphics with the text, you may make a wrong assumption.
有一个注意事项：如果你不把图表和文本结合起来看的话，你可能会得出一个错误的假设。
It causes an error or warning to be returned with the specified SQLSTATE, along with optional message text.
它将促使返回一个错误或警告，包含指定的SQLSTATE以及可选的消息文本。
The complete message text will appear as Warning: length should be less than 255.
完整的消息文本像这样：Warning: length should be less than 255。
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