隐式提交和显式提交(Implicit Database Commits and Explicit Database Commits)

1 Introduction

A database commit closes all opened database cursors. It is particularly important that database commits are not triggered (in one of the ways listed here) in SELECT loops and after the statement OPEN CURSOR.

2 Detail

Implicit Database Commits

The implicit database commits in an AS ABAP are caused by the fact that an AS ABAP uses its own work processes to connect to the database system. A work process can only ever execute a single database LUW but cannot interfere with the database LUWs belonging to other work processes. Since an ABAP program can be executed by different work processes during its runtime, the database LUW for the current work process must be completed each time an action takes place that leads to a change of work process. As a result, a database commit is performed implicitly in the following situation:

Completion of a dialog step

The program waits for a user action and does not occupy a work process during this time. The next free work process is assigned to the program in the next dialog step.
Calling a function module in a synchronous or asynchronous remote function call

The current work process passes control to a different work process or system. An exception to this are updates. When updates are running, sRFC and aRFC do not cause work processes to be switched or database commits to be executed.
Completion of a function module called in a separate work process using a synchronous remote function call.

Usually, a new work process is allocated to the call program. If a new sRFC follows quickly enough, and enough free work processes exist, the work process sRFC continues to be use