[英]How to handle multiple queries in gorm
我正在嘗試使用 gorm 處理嵌套查詢,但我很難弄清楚這一點。
查詢:
SELECT smId AS 'slimeId', slStatus, slPPIV, slHighRiskSituation,
(SELECT count(rnIg) FROM ruins WHERE rnSquidStatus = 'Holding on'
AND rnSmId = smId) AS 'holdingOn',
(SELECT count(rnIg) FROM ruins WHERE rnSquidStatus = 'In system' AND rnSmId = smId)
AS 'inSystem', smSuspectedCorona,
IF(smStatusClosed != 0, 1, 0) as statusClosed, smSurge,
(SELECT GROUP_CONCAT(rnName) FROM ruins WHERE rnSquidStatus = 'Holding on' AND rnSmId = smId)
as 'ruinsOnHold',
(SELECT GROUP_CONCAT(rnName) FROM ruins WHERE rnSquidStatus = 'In system' AND rnSmId = smId)
as 'ruinsInSystem' FROM slimes WHERE slId != 0 GROUP BY slId HAVING slId > 0
所以我可以完成一些非常基礎的工作,問題是當嵌套出現時,我不知道在這種情況下該怎么做
var data []SlimeResponse
db := service.gormdb
db = db.Select("smId as slimeId", "slStatus", "slPPIV", "slHighRiskSituation")
db = db.Where("smId != ?", 0).Group("smId ").Having("smId > ?", 0)
db = db.Table("slimes").Find(&data)
嘗試使用Where
方法,但與Joins
的工作方式不同,但無法使其工作
您可以使用subQuery
var data []SlimeResponse
db := service.gormdb
subQueryHoldingOn := db.
Select("count(rnIg)").
Where("rnSquidStatus = 'In system' AND rnSmId = ?", smId).
Table("ruins")
subQueryInSystem := db.
Select("count(rnIg)").
Where("rnSquidStatus = 'Holding on' AND rnSmId = ?", smId).
Table("ruins")
groupSubQueryHoldingOn := db.
Select("GROUP_CONCAT(rnIg)").
Where("rnSquidStatus = 'In system' AND rnSmId = ?", smId).
Table("ruins")
groupSubQueryInSystem := db.
Select("GROUP_CONCAT(rnIg)").
Where("rnSquidStatus = 'Holding on' AND rnSmId = ?", smId).
Table("ruins")
db = db.Select("smId as slimeId, slStatus, slPPIV, slHighRiskSituation, (?) as holdingOn, (?) as inSystem, smSuspectedCorona, IF(smStatusClosed != 0, 1, 0) as statusClosed, smSurge, (?) as ruinsOnHold, (?) as ruinsInSystem", subQueryHoldingOn, subQueryInSystem, groupSubQueryHoldingOn, groupSubQueryInSystem)
db = db.Where("smId != ?", 0).Group("smId ").Having("smId > ?", 0)
db = db.Table("slimes").Find(&data)
或者
可以直接在Select
中傳入select部分
var data []SlimeResponse
db := service.gormdb
db = db.Select(
`
smId AS 'slimeId',
slStatus,
slPPIV,
slHighRiskSituation,
(
SELECT count(rnIg) FROM ruins WHERE rnSquidStatus = 'Holding on' AND rnSmId = ?
) AS 'holdingOn',
(
SELECT count(rnIg) FROM ruins WHERE rnSquidStatus = 'In system' AND rnSmId = ?
) AS 'inSystem',
smSuspectedCorona,
IF(smStatusClosed != 0, 1, 0) as statusClosed,
smSurge,
(
SELECT GROUP_CONCAT(rnName) FROM ruins WHERE rnSquidStatus = 'Holding on' AND rnSmId = ?
) as 'ruinsOnHold',
(
SELECT GROUP_CONCAT(rnName) FROM ruins WHERE rnSquidStatus = 'In system' AND rnSmId = ?
) as 'ruinsInSystem'
`, smId, smId, smId, smId
)
db = db.Where("smId != ?", 0).Group("smId ").Having("smId > ?", 0)
db = db.Table("slimes").Find(&data)
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