Neo4j批量更新数据

如何在neo4j cypher中更新多个节点

现在我试着这样做：

MATCH (user151325288158:User{userId:151325288158}),
      (user88245:User{userId:88245}) 
SET user151325288158.balance=2902833.4219789803 
SET user88245.balance=146701.0299999991 
RETURN user151325288158.balance,user88245.balance;

[
    {
      "userId": 151325288158,
      "balance": 146701.09
    },
    {
      "userId": 887436512344,
      "balance": 22453.34
    },
    {
      "userId": 873927654232,
      "balance": 300002.22
    }
]

WITH {data} AS pairs
UNWIND pairs AS p
MATCH (u:User) WHERE u.userId = p.userId
SET u.balance = p.balance 

但在这里我有一个问题，若这样的用户在数据库中不存在，并没有人会被更新。 另一个问题是性能，这样的查询速度很慢

---

是否有一些方法可以进行此类批量更新？

假设您在地图/目录数组中有成对的

userId

s和新的

balance

值，如下所示：

MATCH (user151325288158:User{userId:151325288158}),
      (user88245:User{userId:88245}) 
SET user151325288158.balance=2902833.4219789803 
SET user88245.balance=146701.0299999991 
RETURN user151325288158.balance,user88245.balance;

[
    {
      "userId": 151325288158,
      "balance": 146701.09
    },
    {
      "userId": 887436512344,
      "balance": 22453.34
    },
    {
      "userId": 873927654232,
      "balance": 300002.22
    }
]

WITH {data} AS pairs
UNWIND pairs AS p
MATCH (u:User) WHERE u.userId = p.userId
SET u.balance = p.balance 

您可以将此数组作为参数传递给密码查询，以在

userId

上

MATCH

，并更新

balance

属性，如下所示：

MATCH (user151325288158:User{userId:151325288158}),
      (user88245:User{userId:88245}) 
SET user151325288158.balance=2902833.4219789803 
SET user88245.balance=146701.0299999991 
RETURN user151325288158.balance,user88245.balance;

[
    {
      "userId": 151325288158,
      "balance": 146701.09
    },
    {
      "userId": 887436512344,
      "balance": 22453.34
    },
    {
      "userId": 873927654232,
      "balance": 300002.22
    }
]

WITH {data} AS pairs
UNWIND pairs AS p
MATCH (u:User) WHERE u.userId = p.userId
SET u.balance = p.balance 

---

假设在一组映射/目录中有成对的

userId

s和新的

balance

值，如下所示：

MATCH (user151325288158:User{userId:151325288158}),
      (user88245:User{userId:88245}) 
SET user151325288158.balance=2902833.4219789803 
SET user88245.balance=146701.0299999991 
RETURN user151325288158.balance,user88245.balance;

[
    {
      "userId": 151325288158,
      "balance": 146701.09
    },
    {
      "userId": 887436512344,
      "balance": 22453.34
    },
    {
      "userId": 873927654232,
      "balance": 300002.22
    }
]

WITH {data} AS pairs
UNWIND pairs AS p
MATCH (u:User) WHERE u.userId = p.userId
SET u.balance = p.balance 

您可以将此数组作为参数传递给密码查询，以在

userId

上

MATCH

，并更新

balance

属性，如下所示：

MATCH (user151325288158:User{userId:151325288158}),
      (user88245:User{userId:88245}) 
SET user151325288158.balance=2902833.4219789803 
SET user88245.balance=146701.0299999991 
RETURN user151325288158.balance,user88245.balance;

[
    {
      "userId": 151325288158,
      "balance": 146701.09
    },
    {
      "userId": 887436512344,
      "balance": 22453.34
    },
    {
      "userId": 873927654232,
      "balance": 300002.22
    }
]

WITH {data} AS pairs
UNWIND pairs AS p
MATCH (u:User) WHERE u.userId = p.userId
SET u.balance = p.balance 

通过以下步骤，我能够实现多个属性的批更新，如下所示：

            UNWIND [{id: 123456, name: "John", age: 27}, {id: 789012, name: "Jane", age: 24}] AS updateUser
            MATCH (user: User)
            WHERE user.id = updateUser.id
            SET user += updateUser
            RETURN user

通过以下步骤，我能够实现多个属性的批更新，如下所示：

            UNWIND [{id: 123456, name: "John", age: 27}, {id: 789012, name: "Jane", age: 24}] AS updateUser
            MATCH (user: User)
            WHERE user.id = updateUser.id
            SET user += updateUser
            RETURN user