Csv Neo4j使用带空值的合并

我知道这个问题以前被问过好几次，但答案并没有解决我的问题。我正在尝试执行此查询：

USING PERIODIC COMMIT
LOAD CSV WITH HEADERS FROM
'file:///C:/Users/Zona5/Documents/Neo4j/checkIntel/import/personaldata.csv' AS line1
MERGE (a:Address1 {address_name1:line1.address1})

但是我得到了一个错误：

无法使用address\u name1的null属性值合并节点

其他人建议使用：

USING PERIODIC COMMIT
LOAD CSV WITH HEADERS FROM
'file:///C:/Users/Zona5/Documents/Neo4j/checkIntel/import/personaldata.csv' AS line1
MERGE (a:Address1)
 ON CREATE SET a.address_name1=line1.address1
 ON MATCH SET a.address_name1=line1.address1

但如果节点具有多个属性，则此解决方案有效。在我的例子中，它只有
address\u name1
属性

有没有办法解决这个问题，比如在
合并之前用查询中的一个词替换空值，或者其他解决方案？
如果没有地址，您真的需要创建
地址节点吗

您可以使用
WITH
/
从CSV中筛选行，其中
：

USING PERIODIC COMMIT
LOAD CSV WITH HEADERS FROM 'file:///C:/Users/Zona5/Documents/Neo4j/checkIntel/import/personaldata.csv' AS line1
WITH line1
WHERE NOT line1.address1 IS NULL
MERGE (a:Address1 {address_name1:line1.address1})

否则，如果要创建表示“未知”地址的节点，可以使用替换默认值：

USING PERIODIC COMMIT
LOAD CSV WITH HEADERS FROM 'file:///C:/Users/Zona5/Documents/Neo4j/checkIntel/import/personaldata.csv' AS line1
MERGE (a:Address1 {address_name1: coalesce(line1.address1, "Unknown")})

您好：我发布了这个相当广泛的答案，因为我最近在尝试将这些数据加载到Neo4j（Neo4j 3.3.4）中时遇到了处理CSV文件中存在的空（缺失）值的惊人困难

我提出三种解决方案

我使用的是通过pip在Arch Linux x86_64系统上的Python 3.5 venv中安装的Cycli（Cycli 0.7.6）CLI

我的CSV文件（糖酵解代谢产物.CSV）是：

通过psql/COPY从PostgreSQL表复制的这些数据。。。命令，在“名称”字段上具有“唯一非空”约束

在调查了谷歌等之后，我进行了三个实验，如下所示。实验2和实验3基本相同

我相信实验2中显示的方法是最好的解决方案，因为合并语句包含在MERGE语句中

我之所以得出这个结论，是因为实验2使用了“局部”变量，而不是返回“全局”变量（实验3），从而最大限度地减少了重用变量名的意外后果

我按如下方式加载我的密码脚本：

cat glycolysis_script.cypher |  cypher-shell -u victoria -p <your_password>

失败（“无法使用null属性值作为缩写合并节点”）：

实验2

参考：

在这里，我设置了一个空字符串（“”）来替换CSV文件中的空值；你想用什么就用什么；e、 g.：“未定义”、“空”和

USING PERIODIC COMMIT
LOAD CSV WITH HEADERS FROM "file:/mnt/Vancouver/Programming/data/metabolism/pg2neo4j/glycolysis_metabolites.csv" AS row
// MERGE (a:GlycolysisMetabolites {name: row.name})
MERGE (a:GlycolysisMetabolites {name: row.name, abbreviation:COALESCE(row.abbreviation, ''), kegg_entry:COALESCE(row.kegg_entry, '')})
// With "USING PERIODIC COMMIT",
// RETURN a;
// throws this error: "Unknown value type: STRUCT"
// ... so, use this:
RETURN a.name, a.abbreviation, a.kegg_entry;

输出：

$ cat glycolysis.cypher |  cypher-shell -u victoria -p <your_password>

a.name, a.abbreviation, a.kegg_entry
"α-D-glucose", "GLC", "C00267"
"glucose 6-phosphate", "G6P", "C00668"
"fructose 6-phosphate", "F6P", "C05345"
"fructose 1,6-bisphosphate", "FBP", "C05378"
"dihydroxyacetone phosphate", "DHAP", "C00111"
"D-glyceraldehyde 3-phosphate", NULL, "C00118"
"1,3-bisphosphoglycerate", "1,3-BPG", "C00236"
"3-phosphoglycerate", "3PG", "C00197"
"2-phosphoglycerate", "2PG", "C00631"
"phosphoenolpyruvate", "PEP", "C00074"
"pyruvate", NULL, "C00022"

$ cat glycolysis.cypher |  cypher-shell -u victoria -p <your_password>

a.name, a.abbreviation, a.kegg_entry
"α-D-glucose", "GLC", "C00267"
"glucose 6-phosphate", "G6P", "C00668"
"fructose 6-phosphate", "F6P", "C05345"
"fructose 1,6-bisphosphate", "FBP", "C05378"
"dihydroxyacetone phosphate", "DHAP", "C00111"
"D-glyceraldehyde 3-phosphate", "", "C00118"
"1,3-bisphosphoglycerate", "1,3-BPG", "C00236"
"3-phosphoglycerate", "3PG", "C00197"
"2-phosphoglycerate", "2PG", "C00631"
"phosphoenolpyruvate", "PEP", "C00074"
"pyruvate", "", "C00022"

$ cat glycolysis.cypher |  cypher-shell -u victoria -p <your_password>

a_name, a_abbreviation, a_kegg_entry
"α-D-glucose", "GLC", "C00267"
"glucose 6-phosphate", "G6P", "C00668"
"fructose 6-phosphate", "F6P", "C05345"
"fructose 1,6-bisphosphate", "FBP", "C05378"
"dihydroxyacetone phosphate", "DHAP", "C00111"
"D-glyceraldehyde 3-phosphate", "", "C00118"
"1,3-bisphosphoglycerate", "1,3-BPG", "C00236"
"3-phosphoglycerate", "3PG", "C00197"
"2-phosphoglycerate", "2PG", "C00631"
"phosphoenolpyruvate", "PEP", "C00074"
"pyruvate", "", "C00022"

$ cat glycolysis.cypher |  cypher-shell -u victoria -p <password>

row.name, row.abbreviation, row.kegg_entry
"α-D-glucose", "GLC", "C00267"
"glucose 6-phosphate", "G6P", "C00668"
"fructose 6-phosphate", "F6P", "C05345"
"fructose 1,6-bisphosphate", "FBP", "C05378"
"dihydroxyacetone phosphate", "DHAP", "C00111"
"D-glyceraldehyde 3-phosphate", NULL, "C00118"
"1,3-bisphosphoglycerate", "1,3-BPG", "C00236"
"3-phosphoglycerate", "3PG", "C00197"
"2-phosphoglycerate", "2PG", "C00631"
"phosphoenolpyruvate", "PEP", "C00074"
"pyruvate", NULL, "C00022"

输出：

$ cat glycolysis.cypher |  cypher-shell -u victoria -p <your_password>

a.name, a.abbreviation, a.kegg_entry
"α-D-glucose", "GLC", "C00267"
"glucose 6-phosphate", "G6P", "C00668"
"fructose 6-phosphate", "F6P", "C05345"
"fructose 1,6-bisphosphate", "FBP", "C05378"
"dihydroxyacetone phosphate", "DHAP", "C00111"
"D-glyceraldehyde 3-phosphate", NULL, "C00118"
"1,3-bisphosphoglycerate", "1,3-BPG", "C00236"
"3-phosphoglycerate", "3PG", "C00197"
"2-phosphoglycerate", "2PG", "C00631"
"phosphoenolpyruvate", "PEP", "C00074"
"pyruvate", NULL, "C00022"

$ cat glycolysis.cypher |  cypher-shell -u victoria -p <your_password>

a.name, a.abbreviation, a.kegg_entry
"α-D-glucose", "GLC", "C00267"
"glucose 6-phosphate", "G6P", "C00668"
"fructose 6-phosphate", "F6P", "C05345"
"fructose 1,6-bisphosphate", "FBP", "C05378"
"dihydroxyacetone phosphate", "DHAP", "C00111"
"D-glyceraldehyde 3-phosphate", "", "C00118"
"1,3-bisphosphoglycerate", "1,3-BPG", "C00236"
"3-phosphoglycerate", "3PG", "C00197"
"2-phosphoglycerate", "2PG", "C00631"
"phosphoenolpyruvate", "PEP", "C00074"
"pyruvate", "", "C00022"

$ cat glycolysis.cypher |  cypher-shell -u victoria -p <your_password>

a_name, a_abbreviation, a_kegg_entry
"α-D-glucose", "GLC", "C00267"
"glucose 6-phosphate", "G6P", "C00668"
"fructose 6-phosphate", "F6P", "C05345"
"fructose 1,6-bisphosphate", "FBP", "C05378"
"dihydroxyacetone phosphate", "DHAP", "C00111"
"D-glyceraldehyde 3-phosphate", "", "C00118"
"1,3-bisphosphoglycerate", "1,3-BPG", "C00236"
"3-phosphoglycerate", "3PG", "C00197"
"2-phosphoglycerate", "2PG", "C00631"
"phosphoenolpyruvate", "PEP", "C00074"
"pyruvate", "", "C00022"

$ cat glycolysis.cypher |  cypher-shell -u victoria -p <password>

row.name, row.abbreviation, row.kegg_entry
"α-D-glucose", "GLC", "C00267"
"glucose 6-phosphate", "G6P", "C00668"
"fructose 6-phosphate", "F6P", "C05345"
"fructose 1,6-bisphosphate", "FBP", "C05378"
"dihydroxyacetone phosphate", "DHAP", "C00111"
"D-glyceraldehyde 3-phosphate", NULL, "C00118"
"1,3-bisphosphoglycerate", "1,3-BPG", "C00236"
"3-phosphoglycerate", "3PG", "C00197"
"2-phosphoglycerate", "2PG", "C00631"
"phosphoenolpyruvate", "PEP", "C00074"
"pyruvate", NULL, "C00022"

输出：

$ cat glycolysis.cypher |  cypher-shell -u victoria -p <your_password>

a.name, a.abbreviation, a.kegg_entry
"α-D-glucose", "GLC", "C00267"
"glucose 6-phosphate", "G6P", "C00668"
"fructose 6-phosphate", "F6P", "C05345"
"fructose 1,6-bisphosphate", "FBP", "C05378"
"dihydroxyacetone phosphate", "DHAP", "C00111"
"D-glyceraldehyde 3-phosphate", NULL, "C00118"
"1,3-bisphosphoglycerate", "1,3-BPG", "C00236"
"3-phosphoglycerate", "3PG", "C00197"
"2-phosphoglycerate", "2PG", "C00631"
"phosphoenolpyruvate", "PEP", "C00074"
"pyruvate", NULL, "C00022"

$ cat glycolysis.cypher |  cypher-shell -u victoria -p <your_password>

a.name, a.abbreviation, a.kegg_entry
"α-D-glucose", "GLC", "C00267"
"glucose 6-phosphate", "G6P", "C00668"
"fructose 6-phosphate", "F6P", "C05345"
"fructose 1,6-bisphosphate", "FBP", "C05378"
"dihydroxyacetone phosphate", "DHAP", "C00111"
"D-glyceraldehyde 3-phosphate", "", "C00118"
"1,3-bisphosphoglycerate", "1,3-BPG", "C00236"
"3-phosphoglycerate", "3PG", "C00197"
"2-phosphoglycerate", "2PG", "C00631"
"phosphoenolpyruvate", "PEP", "C00074"
"pyruvate", "", "C00022"

$ cat glycolysis.cypher |  cypher-shell -u victoria -p <your_password>

a_name, a_abbreviation, a_kegg_entry
"α-D-glucose", "GLC", "C00267"
"glucose 6-phosphate", "G6P", "C00668"
"fructose 6-phosphate", "F6P", "C05345"
"fructose 1,6-bisphosphate", "FBP", "C05378"
"dihydroxyacetone phosphate", "DHAP", "C00111"
"D-glyceraldehyde 3-phosphate", "", "C00118"
"1,3-bisphosphoglycerate", "1,3-BPG", "C00236"
"3-phosphoglycerate", "3PG", "C00197"
"2-phosphoglycerate", "2PG", "C00631"
"phosphoenolpyruvate", "PEP", "C00074"
"pyruvate", "", "C00022"

$ cat glycolysis.cypher |  cypher-shell -u victoria -p <password>

row.name, row.abbreviation, row.kegg_entry
"α-D-glucose", "GLC", "C00267"
"glucose 6-phosphate", "G6P", "C00668"
"fructose 6-phosphate", "F6P", "C05345"
"fructose 1,6-bisphosphate", "FBP", "C05378"
"dihydroxyacetone phosphate", "DHAP", "C00111"
"D-glyceraldehyde 3-phosphate", NULL, "C00118"
"1,3-bisphosphoglycerate", "1,3-BPG", "C00236"
"3-phosphoglycerate", "3PG", "C00197"
"2-phosphoglycerate", "2PG", "C00631"
"phosphoenolpyruvate", "PEP", "C00074"
"pyruvate", NULL, "C00022"

$cat glycolysis.cypher | cypher shell-u victoria-p
row.name，row.缩写，row.kegg_条目
“α-D-葡萄糖”、“GLC”、“C00267”
“葡萄糖6-磷酸”，“G6P”，“C00668”
“6-磷酸果糖”、“F6P”、“C05345”
“1,6-二磷酸果糖”、“FBP”、“C05378”
“磷酸二羟丙酮”、“DHAP”、“C00111”
“D-甘油醛3-磷酸”，空白，“C00118”
“1,3-二磷酸甘油酯”、“1,3-BPG”、“C00236”
“3-磷酸甘油酯”、“3PG”、“C00197”
“2-磷酸甘油酯”、“2PG”、“C00631”
“磷酸烯醇式丙酮酸”、“PEP”、“C00074”
“丙酮酸”，空，“C00022”

请注意，在Neo4j浏览器中，仅创建了9个（而不是11个）节点：未创建“D-甘油醛3-磷酸”和“丙酮酸”的节点