OCIEnvCreate failed with return code 1 but error message text was not available

一）、vs2019 连接oracle 报OCIEnvCreate failed with return code 1 but error message text was not available 异常，

解决方法：tools-->projects and solutions-->web projects->use the 64 bit version of iis express for web sites and projects(selected)

 

 

 

 

 

二）、现象：windows server2008服务器，连接Oracle11g，程序部署到IIS后无法访问数据库，抛OCIEnvCreate failed with return code 1 but error message text was not available异常；

 

解决方法：连接池-->高级设置-->Enable 32-Bit Applications设为true(默认为false) (只有server服务器有该配置）