在64位环境下用PL/SQL Developer连接:1. 下载32位Oracle InstantClient,并展开到某目录,例如C:\instantclient-basic-nt-11.2.0.2.0;2. 将系统的tnsnames.ora拷贝到该目录下;3. 在PLSQL Developer中设置Oracle_Home和OCI Library: ToolsPreferencesOracleConnection:Oracle_Home: C:\instantclient-basic-nt-11.2.0.2.0OCI Library: C:\instantclient-basic-nt-11.2.0.2.0\oci.dll4. 在PLSQL Developer目录下编辑如下,替换其快捷方式,启动PLSQL Developer:@echo offset path=C:\instantclient-basic-nt-11.2.0.2.0set ORACLE_HOME=C:\instantclient-basic-nt-11.2.0.2.0set TNS_ADMIN=C:\instantclient-basic-nt-11.2.0.2.0set NLS_LANG=AMERICAN_AMERICA.ZHS16GBKstart plsqldev.exe