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对于我来说：Neo4j的OGM Neo4jSession变量替换查询失败
neo4jSession.query("MATCH (n:Widget) WHERE (n.partNumber STARTS WITH '001') RETURN n.partNumber AS id, n.name AS description, n.urn AS urn LIMIT 10", Collections.emptyMap());
作品。
该查询不起作用：
String query = "MATCH (n:Widget) " +
"WHERE (n.partNumber STARTS WITH {queryString}) " +
"RETURN n.partNumber AS id, n.name AS description, n.urn AS urn " +
"LIMIT {limit}";
Map<String, Object> params = ImmutableMap
.<String, Object>builder()
.put("queryString", queryString)
.put("limit", limit)
.build();
return (List) neo4jOperations.queryForObjects(Object.class, query, params);
它返回一个空列表。我也尝试过使用我的实际域对象：
return (List) neo4jOperations.queryForObjects(Widget.class, query, params);
具有相同的结果。
我正在使用OGM 2.0.2，neo4j 2.3.2和Spring Data Neo4j 4.1.1但我没有使用Neo4jOperations，而是使用Neo4jSession自己尝试了这一点，结果相同。哦，我还用HTTP驱动程序去除了neo4j的实例。
OGM中有错误吗？
更多信息：
在电线，相信消息是这样的：
{ "statements":[
{
"statement":"MATCH (n:Widget) WHERE (n.partNumber STARTS WITH {queryString}) RETURN n.partNumber AS id, n.name AS description, n.urn AS urn LIMIT {limit}",
"parameters":{
"queryString":"001",
"limit":10
},
"resultDataContents":[
"graph"
],
"includeStats":false
} ] }
{ "statements":[
{
"statement":"MATCH (n:Widget) WHERE (n.partNumber STARTS WITH '001') RETURN n.partNumber AS id, n.name AS description, n.urn AS urn LIMIT 10",
"parameters":{
},
"resultDataContents":[
"rest"
],
"includeStats":true
} ] }
甚至更多的信息：
我已经尝试过的Widget这既是@QueryResult AND作为@NodeEntity（w/getters和setters）。
@QueryResult
public class TypeaheadData {
public Object id;
public String description;
public String uid;
}
和
@NodeEntity
public class TypeaheadData {
public Object id;
public String description;
public String uid;
public TypeaheadData() {
}
public Object getId() {
return id;
}
public void setId(Object id) {
this.id = id;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public String getUid() {
return uid;
}
public void setUid(String uid) {
this.uid = uid;
}
}
我也检查过线的响应，并在这两种情况下，它看起来像这样：
{
"results":[
{
"columns":[
"id",
"description",
"uid"
],
"data":[
{
"graph":{
"nodes":[
],
"relationships":[
]
}
},
{
"graph":{
"nodes":[
],
"relationships":[
]
}
},
{
"graph":{
"nodes":[
],
"relationships":[
]
}
},
{
"graph":{
"nodes":[
],
"relationships":[
]
}
},
{
"graph":{
"nodes":[
],
"relationships":[
]
}
},
{
"graph":{
"nodes":[
],
"relationships":[
]
}
},
{
"graph":{
"nodes":[
],
"relationships":[
]
}
},
{
"graph":{
"nodes":[
],
"relationships":[
]
}
},
{
"graph":{
"nodes":[
],
"relationships":[
]
}
},
{
"graph":{
"nodes":[
],
"relationships":[
]
}
}
]
}
],
"errors":[
]
}
如果我删除了Widget @NodeEntity，这是送出的要求：
{
"statements":[
{
"statement":"MATCH (n:Widget) WHERE (n.partNumber STARTS WITH {queryString}) RETURN n.partNumber AS id, n.name AS description, n.urn AS urn LIMIT {limit}",
"parameters":{
"queryString":"001",
"limit":10
},
"resultDataContents":[
"row"
],
"includeStats":false
}
]
}
，并具有清除了Widget @NodeEntity，响应确实有它正确的数据，但映射抛出：
标响应查询必须只返回一列。确保您的密码查询 只返回一个项目。
queryForObject不是您应该使用随机节点属性的方法。我已对您报告的问题进行了评论https://github.com/neo4j/neo4j-ogm/issues/184 – Luanne