Python和PostgreSQL - GeomFromText

Question

我是Python学习者，

我正在尝试将几何记录插入PostgreSQL。

如果我尝试没有几何列的查询，它可以正常工作并且所有数据都已成功插入。

cur.execute("INSERT INTO taxi (userid,carNum) SELECT '"+str(msg['UserID'])+"',"+str(msg['CarNumber']))

尝试添加几何记录后，没有任何反应！执行结束但没有错误但没有插入到DB中。

cur.execute("INSERT INTO taxi (position,userid,carNum) SELECT GeomFromText('POINT("+str(float(msg['longitude']))+" "+str(float(msg['latitude']))+")',4326),'"+str(msg['UserID'])+"',"+str(msg['CarNumber']))

无法弄清楚我在这里缺少什么

Answer 1

您需要将数据提交到数据库。

查看psycopg2 http://initd.org/psycopg/docs/usage.html#passing-parameters-to-sql-queries

的文档

按照这些步骤

>>> import psycopg2

# Connect to an existing database
>>> conn = psycopg2.connect("dbname=test user=postgres")

# Open a cursor to perform database operations
>>> cur = conn.cursor()

# Execute a command: this creates a new table
>>> cur.execute("CREATE TABLE test (id serial PRIMARY KEY, num integer, data varchar);")

# Pass data to fill a query placeholders and let Psycopg perform
# the correct conversion (no more SQL injections!)
>>> cur.execute("INSERT INTO test (num, data) VALUES (%s, %s)",
...      (100, "abc'def"))

# Query the database and obtain data as Python objects
>>> cur.execute("SELECT * FROM test;")
>>> cur.fetchone()
(1, 100, "abc'def")

# Make the changes to the database persistent
>>> conn.commit()

# Close communication with the database
>>> cur.close()
>>> conn.close()