Javascript 使用总和或减数更新重复密钥时插入
我一直在努力寻找答案,但找不到答案 我有这张桌子 我使用这个查询来更新它(这个查询是必须的,因为我有来自前端的动态输入,所以我可以更新多行) 问题是,如果我运行上面的查询。该表应该更新,但我希望添加totalQuantity列,这样test1的值应该是46,test2的值应该是73。我不知道该怎么办 名称列是唯一的,并且是一个键 我正在用nodejs进行查询Javascript 使用总和或减数更新重复密钥时插入,javascript,mysql,node.js,sql-update,sql-insert,Javascript,Mysql,Node.js,Sql Update,Sql Insert,我一直在努力寻找答案,但找不到答案 我有这张桌子 我使用这个查询来更新它(这个查询是必须的,因为我有来自前端的动态输入,所以我可以更新多行) 问题是,如果我运行上面的查询。该表应该更新,但我希望添加totalQuantity列,这样test1的值应该是46,test2的值应该是73。我不知道该怎么办 名称列是唯一的,并且是一个键 我正在用nodejs进行查询 let query4 = `INSERT INTO main_inventory(name,sellingPrice,purchas
let query4 = `INSERT INTO main_inventory(name,sellingPrice,purchasePrice,averagePrice,totalQuantity) VALUES`
for(let x=0;x<main_items.length;x++){
if(x+1 == main_items.length){
query4 = query4+`("${main_items[x].item}",${main_items[x].sellingPrice},${main_items[x].purchasePrice},${main_items[x].averagePrice},${main_items[x].quantity})
ON DUPLICATE KEY UPDATE name = VALUES(name),sellingPrice = VALUES(sellingPrice),purchasePrice = VALUES(purchasePrice),averagePrice = VALUES(averagePrice),totalQuantity = VALUES(totalQuantity)`
}else{
query4 = query4+`("${main_items[x].item}",${main_items[x].sellingPrice},${main_items[x].purchasePrice},${main_items[x].averagePrice},${main_items[x].quantity}),`
}
}
let query4=`插入主库存(名称、销售价格、采购价格、平均价格、总数量)值`
对于(设x=0;x,您可以引用在查询的UPDATE
部分插入的列的当前值,如:
INSERT INTO main_inventory(name, sellingPrice, purchasePrice, averagePrice, totalQuantity)
VALUES ('test1', 20, 5, 27.5, 23), ('test2', 20, 5, 27.5, 50)
ON DUPLICATE KEY UPDATE
name = VALUES(name),
sellingPrice = VALUES(sellingPrice),
purchasePrice = VALUES(purchasePrice),
averagePrice = VALUES(averagePrice),
totalQuantity = totalQuantity + VALUES(totalQuantity) -- add to the original value
INSERT INTO main_inventory(name, sellingPrice, purchasePrice, averagePrice, totalQuantity)
VALUES ('test1', 20, 5, 27.5, 23), ('test2', 20, 5, 27.5, 50)
ON DUPLICATE KEY UPDATE
name = VALUES(name),
sellingPrice = VALUES(sellingPrice),
purchasePrice = VALUES(purchasePrice),
averagePrice = VALUES(averagePrice),
totalQuantity = totalQuantity + VALUES(totalQuantity) -- add to the original value