Neo4j BatchInserter使用setNodeProperties设置带有值的数组(Neo4j BatchInserter using setNodeProperties to set an

Neo4j BatchInserter使用setNodeProperties设置带有值的数组(Neo4j BatchInserter using setNodeProperties to set an array with values)

我正在使用BatchInserter实例来获取和设置节点的属性。 我的数据在某些属性中有多个值。

property value ======== ========= synonym animal synonym mammalian

我想将这些值放在同一节点的同一属性中。

我使用以下代码片段来读取和设置值：

String[] values = {"animal", "mammalian"}; for (int i = 0; i < values.length(); i++) { Map<String, Object> nodeProps = db.getNodeProperties(0); // Node 0 properties nodeProps.put("synonym", values[i]); db.setNodeProperties(0, nodeProps); }

在第一次迭代属性中， synonym获得值animal 。 在第二次迭代中，属性被 mammalian值覆盖 。

我的问题是：如何获取之前的值，添加新的值并将属性设置为节点，以便我可以在图形中获得synonym=['animal', 'mammalian'] ？

I am using the BatchInserter instance to get and set properties for nodes. My data have multiple values in some properties.

property value ======== ========= synonym animal synonym mammalian

I want to put this values, in the same property in the same node.

I have used the following code snippet to read and set values:

String[] values = {"animal", "mammalian"}; for (int i = 0; i < values.length(); i++) { Map<String, Object> nodeProps = db.getNodeProperties(0); // Node 0 properties nodeProps.put("synonym", values[i]); db.setNodeProperties(0, nodeProps); }

In the first iteration property synonym gets value animal. In the second iteration, the property is overridden by the value mammalian.

My question is: How can I get the previous value(s), add the new one and set the property to the node so I can get synonym=['animal', 'mammalian'] in graph?

最满意答案

如果要在节点/关系属性上具有多个值，则需要使用数组。 所以你在属性synonyms有一个String[]作为值：

修改现有财产：

String[] values = {"animal", "mammalian"}; Map<String, Object> nodeProps = db.getNodeProperties(0); String[] existingValues = nodeProps.get("synonym"); // using org.apache.commons.lang.ArrayUtils from Apache Commons Lang: String[] amendedValues = ArrayUtils.addAll(existingValues, values); nodeProps.put("synonym", amendedValues); db.setNodeProperties(0, nodeProps);

If you want to have multiple values on a node/relationship property you need to use arrays. So you have on property synonyms with a String[] as value:

To amend an existing property:

String[] values = {"animal", "mammalian"}; Map<String, Object> nodeProps = db.getNodeProperties(0); String[] existingValues = nodeProps.get("synonym"); // using org.apache.commons.lang.ArrayUtils from Apache Commons Lang: String[] amendedValues = ArrayUtils.addAll(existingValues, values); nodeProps.put("synonym", amendedValues); db.setNodeProperties(0, nodeProps);