C# 连接到 Oracle 数据库错误 ORA-12545: 连接失败，因为目标主机或对象不存在

Question

我想从 C# 连接到 Oracle 数据库，但我不能因为这个错误 ORA-12545: Connect failed because target host or object does not exist 那我该怎么办？

C#代码

  string strConn = "Data Source =(DESCRIPTION =" +
                                 "(ADDRESS = (PROTOCOL = TCP)(HOST = DESKTOP-EIQ5MRF)(PORT = 1521))" +
                                 "(CONNECT_DATA =" +
                                 " (SERVER = DEDICATED)" +
                                 "(SERVICE_NAME = XE)" +
                                 ")" +
                                 ");User Id =system;password=bluesky;";
                OracleConnection conn = new OracleConnection(strConn);

                conn.Open();
                conn.Close();

listener.ora

SID_LIST_LISTENER = (SID_LIST = (SID_DESC = (SID_NAME = PLSExtProc) (ORACLE_HOME = C:\oraclexe\app\oracle\product.2.0\server) (PROGRAM = extproc) ) (SID_DESC = (SID_NAME = CLRExtProc) (ORACLE_HOME = C:\oraclexe\app\oracle\product.2.0\server) (PROGRAM = extproc) ) )

LISTENER = (DESCRIPTION_LIST = (DESCRIPTION = (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1)) (ADDRESS = (PROTOCOL = TCP)(HOST = DESKTOP-EIQ5MRF)(PORT = 1521)) ) )

DEFAULT_SERVICE_LISTENER = (XE)

tnsnames.ora

XE = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = DESKTOP-EIQ5MRF)(PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = XE) ) )

EXTPROC_CONNECTION_DATA = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1)) ) (CONNECT_DATA = (SID = PLSExtProc) (PRESENTATION = RO) ) )

ORACLR_CONNECTION_DATA = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1)) ) (CONNECT_DATA = (SID = CLRExtProc) (PRESENTATION = RO) ) )

Answer 1

错误

ORA-12454: connect failed because target host or object does not exist

这意味着你的连接字符串有问题，再次检查所有访问数据，机器名称并尝试使用此连接字符串，你忘记添加 "ADDRESS_LIST" ，检查 doc. 这里。

使用 ODP.NET 而不使用 tnsnames.ora，应该像

    var sampleConn= @"Data Source=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=    (PROTOCOL=TCP)(HOST=MyHost)(PORT=MyPort)))
                    (CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=MyOracleSID)));
                     User Id=myUsername;Password=myPassword;"

所以你的连接字符串应该是这样的

   string strCon =@"Data Source=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=DESKTOP-EIQ5MRF)(PORT=1521)))
                             (CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=XE)));
                             User Id = system; Password = bluesky; ";

C# 连接到 Oracle 数据库错误 ORA-12545: 连接失败，因为目标主机或对象不存在

C# Connect to Oracle DataBase Error ORA-12545: Connect failed because target host or object does not exist

c#

database-connection

oracle11g