python 操作达 梦数据库，,python 达梦数

python 操作达 梦数据库，,python 达梦数

python 达梦数据库操作流程连接数据库 dm.connect( ... )获取游标 dm_conn.cursor()编写SQL语句 sql_str执行SQL语句 dm_cursor.execute()获取结果列表 dt_breakpoint = dm_cursor.fetchall()关闭游标 dm_cursor.close()关闭数据库连接 dm_conn.close()

代码示例

import pandas as pdimport numpy as npimport datetimeimport dmPython as dmuser_name = "dameng"passwd = "admin"server_name = "LOCALHOST"server_port = 5236def query_ustpf_time_breakpoint( wf_no ):        dm_conn = dm.connect( user=user_name, password=passwd, server=server_name, port=server_port )    dm_cursor = dm_conn.cursor()    sql_str = "select MAIN_LF_4H_PROC_TIME from WF_ST_PF_PARA where WINDPLANT_NO=%d;" % ( wf_no )    print( "func(query_ustpf_time_breakpoint):", sql_str )    try:        dm_cursor.execute( sql_str )    except Exception as e:        print( ‘func(query_ustpf_time_breakpoint) -- dm_cursor.execute(...) Error: ‘, e )    dt_breakpoint = dm_cursor.fetchall()    dm_cursor.close()    dm_conn.close()    if len( dt_breakpoint ) > 0:        return dt_breakpoint[0][0]    else:        return None

备注

预先安装达梦数据库python语言支持包dmPython。

python 操作达 梦数据库