Unlike bind variables, a substitution variable is processed on the client side, and its value will be substituted before submitting the command for execution.
不同于绑定变量，替代变量在客户端加以处理，且其值会在提交执行命令之前被替换。
Unlike bind variables, a substitution variable is processed on the client side, and its value will be substituted before submitting the command for execution.
不同于绑定变量，替代变量在客户端加以处理，且其值会在提交执行命令之前被替换。
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