职责链(Chain of Responsibility)设计模式先创建了一批用于解决目标问题的不同方法,然后将它们连成一条“链”。当一个请求到达时,会顺着这条链传递下去,直到遇到链上某个可以处理该请求的方法。
可以很容易地用常量特…
1.主键字段为空问题
错误信息
org.apache.flink.table.api.TableException: Column bus_no is NOT NULL, however, a null value is being written into it. You can set job configuration table.exec.sink.not-null-enforcerDROP to suppress this exception and drop …