Execute SQL from Python：格式化结果集

Question

我有一个 python 脚本可以让我 query a GIS database using SQL 在 Python:

import sys
import arcpy

try:
    arcpy.env.workspace = sys.path[0]
    egdb_conn = arcpy.ArcSDESQLExecute(r"Database Connections\Connection1.sde")
--> sql_statement = """SELECT * FROM USER1.A_TEST_TABLE"""
    sql_statement_list = sql_statement.split(";")
    print("+++++++++++++++++++++++++++++++++++++++++++++\n")
    # For each SQL statement passed in, execute it.
    for sql in sql_statement_list:
        print(sql)
        try:
            egdb_return = egdb_conn.execute(sql)
        except Exception as err:
            print(err)
            egdb_return = False
        if isinstance(egdb_return, list):
            for row in egdb_return:
                print(row)
            print("+++++++++++++++++++++++++++++++++++++++++++++\n")
        else:
            if egdb_return == True:
                print("SQL statement: {0} ran successfully.".format(sql))
            else:
                print("SQL statement: {0} FAILED.".format(sql))
            print("+++++++++++++++++++++++++++++++++++++++++++++\n")
except Exception as err:
    print(err)

脚本工作正常，但输出有点难以阅读：

+++++++++++++++++++++++++++++++++++++++++++++

SELECT * FROM INFRASTR.A_TEST_TABLE
[1, u'1', u'APPLE', 0.1]
[2, u'2', u'PEAR', 0.2]
[3, u'3', u'BANANA', 0.3]
[4, u'4', u'MANGO', 0.4]
[5, u'5', u'ORANGE', 0.5]
[6, u'6', u'BLUEBERRY', 0.6]
[7, u'7', u'STRAWBERRY', 0.7000000000000001]
[8, u'8', u'RASPBERRY', 0.8]
[9, u'9', u'KIWI', 0.9]
[10, u'10', u'PINEAPPLE', 1.0]
+++++++++++++++++++++++++++++++++++++++++++++

如果结果集能够以更传统的 table 格式输出，将会很有帮助。这样的东西会很棒（虽然我不喜欢这个确切的布局）：

 OBJECTID  ID  TYPE        COST 
 1         1   APPLE       0.01 
 2         2   PEAR        0.02 
 3         3   BANANA      0.03 
 4         4   MANGO       0.04 
 5         5   ORANGE      0.05 
 6         6   BLUEBERRY   0.06 
 7         7   STRAWBERRY  0.07 
 8         8   RASPBERRY   0.08 
 9         9   KIWI        0.09 
 10        10  PINEAPPLE   1.00

我该怎么做？我不确定如何设置值的格式，因为它们在列表中。我不太担心将 COST 格式化为货币；我可以在 SQL.

中做到这一点

Answer 1

您可以将输出传递给字典和 pandas 数据框。可能有更有效的方法，但像这样的方法会起作用。

import pandas

s = []
for row in egdb_return:
    r = []
    r.append(row)
    d = {}
    d["ObjectId"] = r.[1]
    d["ID"] = r[2]
    d["Type"] = r[3]
    d["Cost"] = r[4]
    s.append(d)

Table = pandas.dataframe(s)
print(Table)

Answer 2

print(("{:<15}"*len(row)).format(*row))

将为您提供 len(row) 左对齐列：

>>> row = [1, 3.4, "Pie", "pi", "a"]
>>> print(("{:<15}"*len(row)).format(*row))
1              3.4            Pie            pi             a

这只是做 "{:<15}"*len(row) 以获得 "{:<15}{:<15}...{:<15}" 然后格式化行中的值。

Execute SQL from Python：格式化结果集

Execute SQL from Python: Format the result set

python

sql

formatting

resultset