如何将数据导出到嵌套数组中的JSON文件

问题描述

我正在尝试从@R_995_4045@ION_SCHEMA.COLUMNS导出table_schema，table_name，column_name，并将其导出到JSON文件中。我成功地做到了。我需要使用JSON文件在HTML中显示项目。

我的数据库的EG：

Table_Schema: has 5 different types of schema
Table_name: Each schema has about 4-5 table
Column_Name: Each table has about 4 columns name

这是我导出的JSON文件的示例

[
{
    "table_schema": "A","table_name": "TA","column_name": "typname",},{
    "table_schema": "A","table_name": "TB","column_name": "typnamespace","table_name": "TC","column_name": "typowner",{
    "table_schema": "B","table_name": "FB","column_name": "typlen","table_name": "FG","column_name": "typbyval",{
    "table_schema": "C","table_name": "CQ","column_name": "typtype","column_name": "typisdefined","table_name": "CO","column_name": "typdelim",} .......20339 ROWS MORE

Python文件

GetAllTables():
conn = None

try:

    params = config()
    conn = psycopg2.connect(**params)
    cur = conn.cursor()
    cur.execute("""SELECT TABLE_SCHEMA,TABLE_NAME,COLUMN_NAME
    FROM @R_995_4045@ION_SCHEMA.COLUMNS;""")
    
    rows = cur.fetchall()

    rowarray_list = [] 
    for row in rows:
        rowarray_list.append({'table_schema':row[0],'table_name': row[1],'column_name':row[2]
                              })

    rowarray_file= 'tables1.json'
    with open(rowarray_file,'w') as outfile:
        j = json.dump(rowarray_list,outfile,indent=4)

    cur.close()
except(Exception,psycopg2.DatabaseError) as error:
    print(error)

finally:
    if conn is not None:
        conn.close()

因此，当我尝试在HTML中显示数据时，将重复打印出Table_Schema和Table_Name。

我尝试使用_.uniqBy函数，但是它消除了列表中的其他对象

_。uniqBy（）：

var someObject = require('../table_schema_name.json')
var uniqueALR = uniqBy(someObject,'table_schema');

结果：

[
 { table_schema: 'A',table_name: 'TA',column_name : 'typname'},{
    table_schema: 'B',table_name: 'FB',column_name : 'typlen'
  },{
    table_schema: 'C',table_name: 'CQ',column_name : 'typtype'
  },

是否有更好的方法可以只显示一个不同的table_schema和table_name而不删除其他重要数据？

解决方法

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