python 往oracle里面写DataFrame（二）

之前写了python 往oracle里面DataFrame， 在自己的笔记本上奏效，但是放在集群上去，就会失效了，报错内容为：
sqlalchemy.exc.DatabaseError: (cx_Oracle.DatabaseError) ORA-12505: TNS: 监听程序当前无法识别连接描述符中所给出的 SID

解决方案为创建引擎的方式有所变化，具体的代码入下

from sqlalchemy.dialects.oracle import \
            BFILE, BLOB, CHAR, CLOB, DATE, \
            DOUBLE_PRECISION, FLOAT, INTERVAL, LONG, NCLOB, \
            NUMBER, NVARCHAR, NVARCHAR2, RAW, TIMESTAMP, VARCHAR, \
            VARCHAR2
def mapping_df_types(df):
    dtypedict = {}
    for i, j in zip(df.columns, df.dtypes):
        if "object" in str(j):
            dtypedict.update({i: VARCHAR(256)})
        if "float" in str(j):
            dtypedict.update({i: NUMBER(19,8)})
        if "int" in str(j):
            dtypedict.update({i: VARCHAR(19)})
    return dtypedict
## 往集群oracle写入数据
def put_df_toOracle_cluster(df_data , tableName , ip , port ,uname,pwd , tnsname):    
    import cx_Oracle as cx_Oracle
    from sqlalchemy import create_engine
#    ip = 'localhost'
#    port = '1521'
#    uname = 'chensq' # 用户名
#    pwd = '123456' # 密码
#    tnsname = 'orcl' # 实例名
     dsnStr = cx_Oracle.makedsn(ip, port, service_name=tnsname)
     connect_str = "oracle://%s:%s@%s" %(uname, pwd, dsnStr)
     engine = create_engine(connect_str, encoding=encoding)
     from sqlalchemy.dialects.oracle import \
            BFILE, BLOB, CHAR, CLOB, DATE, \
            DOUBLE_PRECISION, FLOAT, INTERVAL, LONG, NCLOB, \
            NUMBER, NVARCHAR, NVARCHAR2, RAW, TIMESTAMP, VARCHAR, \
            VARCHAR2
    dtypedict = mapping_df_types(df_data)
    print(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>开始")
    print(dtypedict)
    print(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>结束")
    df_data.to_sql(tableName,engine,index=False,if_exists='append',dtype=dtypedict,chunksize=None)
#------------------------------

参考博客为：
【1】https://blog.csdn.net/AlanGuoo/article/details/88255194
【2】: https://blog.csdn.net/walking_visitor/article/details/84023393