Jdbc input plugin（翻译）

sql_last_value

The value used to calculate which rows to query. Before any query is run, this is set to Thursday, 1 January 1970, or 0 if use_column_value
is true and tracking_column
is set. It is updated accordingly after subsequent queries are run.
该值用来计算行的值，在执行任何查询前，这个会被设置为1970年1月1日星期四，如果use_column_value为true并且设置了tracking_column，则为0。在运行后续查询后，它会相应更新。

Example:

input {
jdbc {
statement => "SELECT id, mycolumn1, mycolumn2 FROM my_table WHERE id > :sql_last_value"
use_column_value => true
tracking_column => "id"
# ... other configuration bits
}
}