如何通过python+sqlalchemy获得MSsql视图的结构

阿桂天山2024-10-02 23:26

话不多说

目的:为了对接第三方表视图,需要知道表视图的字段结构,如名称,对应的表字段类型

实现结果如图:

直接上代码:

from sqlalchemy import create_engine, MetaData, select, text
from web import urlquote

DRIVER = "ODBC Driver 18 for SQL Server"
INSTANCENAME = "\SQLEXPRESS"
host='127.0.0.1'
pwd='xxxxxxxxxxx'
dbname='dbdbdbdb'
engine = create_engine(f"mssql+pyodbc://sa:{urlquote(pwd)}@{host}{INSTANCENAME}:1433/{dbname}?driver={DRIVER}&TrustServerCertificate=yes", fast_executemany=True)


# 查询所有的视图名称
views_query = text("""
SELECT TABLE_NAME 
FROM INFORMATION_SCHEMA.VIEWS 
WHERE TABLE_SCHEMA = 'dbo'
""")
with engine.connect() as conn:
    result = conn.execute(views_query)
    views = result.fetchall()

    # 对于每个视图，查询其字段和字段类型
    for view in views:
        if 'vw_OrdersByTimestamp'==view['TABLE_NAME']:
            view_name = view['TABLE_NAME']
            columns_query = text("""
            SELECT COLUMN_NAME, DATA_TYPE 
            FROM INFORMATION_SCHEMA.COLUMNS 
            WHERE TABLE_NAME = :view_name AND TABLE_SCHEMA = 'dbo'
            """)
            result = conn.execute(columns_query, view_name=view_name)
            columns = result.fetchall()
            print(f"视图名称: {view_name}")
            for column in columns:
                print(f"列名: {column['COLUMN_NAME']}, 数据类型: {column['DATA_TYPE']}")


    # 关闭数据库连接
    engine.dispose()

以上未完,后续有待解决对应的物理表名称,物理表字段名称