信号语句条件 [计] condition with signal statement
信号赋值语句 signala Ssignment statement ; Signal Evaluate
并行信号赋值语句 SIGNAL ASSGNMENT ; Concurrent Signal Assignment ; Concurrent Signal Assignment Statement
条件信号赋值语句 Conditional Signal Assignment Statement ; SELECTED SIGNAL ASSIGNMENTS
选择信号赋值语句 Selected Signal Assignment Statement ; selected signal assignment
信号代入语句 SIGNAL ASSIGNMENT
选择信号代入语句 selective signal assignment
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到这时，用户可以编写shell脚本，在变量中存储信息和导出信息，控制文件描述符，控制信号处理，使用for循环和case语句，以及其他大量功能。
Now, users could write shell scripts; store and export information in variables; control file descriptors; control signal handling, for loops, and case statements; and so much more.
如果违反了您在触发器中定义的业务规则，就可以使用signal语句来抛出一个错误条件信号。
You can use a SIGNAL statement to raise an error condition if the business rule defined in your trigger is violated.
第一种方式是为SIGBUS信号设置信号处理程序，并在处理程序中简单的执行return语句。
The first way is to install a signal handler for the SIGBUS signal, and then simply call return in the handler.
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