Question

我有这个python函数我试图在Postgresql 9.2中转换成sql。

def calc_open_order(xOrder):
    temp_row = xOrder.so_reportL[0]
    open_closed_status = 'OPEN'
    order_status = temp_row[3]
    if order_status == 'FAILED':
        open_closed_status = 'CLOSED'
    elif order_status == 'REMOVED':
        open_closed_status = 'CLOSED'
    elif order_status == 'NO_PENDING_ACTION':
        open_closed_status = 'CLOSED'
    elif order_status == 'PENDING_REMOVED':
        open_closed_status = 'CLOSED'
    else:
        # check the shipping group status
        any_open_sg = False
        for sd_row in xOrder.so_reportL:
            if sd_row[45] == 'PENDING_SHIPMENT':
                any_open_sg = True
            elif sd_row[45] == 'PROCESSING':
                any_open_sg = True
            elif sd_row[45] == 'INITIAL':
                any_open_sg = True
            elif sd_row[45] == 'PENDING_MERCHANT_ACTION':
                any_open_sg = True
        if any_open_sg == False:
            open_closed_status = 'CLOSED'
    #
    if open_closed_status == 'CLOSED':
        ord_open_ind = 'False'
    else:
        ord_open_ind = 'True'
    return ord_open_ind,

我已使用案例陈述将此逻辑转换为sql：

SELECT CASE WHEN (
         CASE WHEN CASE WHEN ord_status IN ('FAILED','REMOVED','NO_PENDING_ACTION', 'NO_PEDNING_ACTION', 'PENDING_REMOVED') THEN 'CLOSED'
                        WHEN ord_status NOT IN ('FAILED','REMOVED','NO_PENDING_ACTION', 'NO_PEDNING_ACTION', 'PENDING_REMOVED') THEN 'OPEN'
                        WHEN SHIPPING_STATUS IN ('PENDING_SHIPMENT','PROCESSING','INITIAL','PENDING_MERCHANT_ACTION') THEN 'True'
                        ELSE 'False' END = 'False' THEN 'CLOSED' AS OPEN_ORDER_IND

请注意，sd_row [45]与Shipping_status字段相同。我的个案陈述是对的吗？

Answer 1

可能（未经测试）：

SELECT CASE WHEN ord_status IN ('FAILED','REMOVED','NO_PENDING_ACTION', 'PENDING_REMOVED')
              OR shipping_status NOT IN ('PENDING_SHIPMENT','PROCESSING','INITIAL','PENDING_MERCHANT_ACTION')
            THEN 'False'::text
            ELSE 'True' END AS ord_open_ind

返回类型最好应该是boolean，但这不在您的问题中。

在postgresql中嵌套案例语句

1 个答案: