单字符的command是要对指定行执行的操作。
The single-character command is the action to perform on the specified lines.
在这个例子中，如果目标和源数据表有匹配的行，就实行更新操作。
In this example, and update occurs if the target and source have matching row.
在构建你的操作系统的时候，你将会编写上百成千行的代码。
During your code building you will write hundreds, even thousands, of lines of code.
对于每一个行id,fetch操作符将读取表中相应的行。
For each row ID, the FETCH operator reads the corresponding row from the table.
第17行说明了向操作发送哪些的名称和值。
Line 17 explains what name and value pair to send to the action.
互操作日志文件的第二行表示托管签名。
The second line of the interop log file represents the managed signature.
允许您访问在批处理更新操作期间已处理的行。
Lets you access the rows processed during a batch update operation.
允许您访问在批处理更新操作期间已处理的行。
Lets you access the rows processed during a batch update operation.
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