oracle 19c中的c代表的意思是

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1、确保已安装Oracle客户端，已创建数据库

2、在项目中安装Oracle.ManagedDataAccess Nuget包

在vs中工具——Nuget包管理器——管理解决方案的Nuget程序包——搜索安装即可（确保联网）

3、添加引用using Oracle.ManagedDataAccess.Client;

4、创建查询方法

确定连接字符串：

Data Source：数据源

可在Oracle安装目录 C:appAdminproduct11.2.0dbhomeNETWORKADMIN下tnsnames.ora中找到，记事本打开如下：

# tnsnames.ora Network Configuration File: C:appAdminproduct11.2.0dbhome
etworkadmin	nsnames.ora
# Generated by Oracle configuration tools.

LISTENER_ORCL =
 (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))


ORACLR_CONNECTION_DATA =
 (DESCRIPTION =
 (ADDRESS_LIST =
 (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
 )
 (CONNECT_DATA =
 (SID = CLRExtProc)
 (PRESENTATION = RO)
 )
 )

ORCL =
 (DESCRIPTION =
 (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
 (CONNECT_DATA =
 (SERVER = DEDICATED)
 (SERVICE_NAME = orcl)
 )
 )

连接字符串Data Source为最后一部分

 (DESCRIPTION =
 (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
 (CONNECT_DATA =
 (SERVER = DEDICATED)
 (SERVICE_NAME = orcl)
 )
 )

User Id：用户名

Password：安装时设置的口令（密码）

public DataTable ExportDataTable(string tableName, string selectStr)
 {
  DataTable dt = new DataTable();
  if (selectStr == "" || selectStr == null)
  {
  selectStr = "1=1";
  }
  try
  {
  using (OracleConnection con = new OracleConnection("Data Source=(DESCRIPTION =(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))(CONNECT_DATA =(SERVER = DEDICATED)(SERVICE_NAME = orcl)));User Id=system;Password=147258"))
  {
   con.Open();
   string cmdStr = $"select * from {tableName} where {selectStr}";
   OracleCommand command = new OracleCommand(cmdStr, con);
   OracleDataAdapter adapter = new OracleDataAdapter(command);
   adapter.Fill(dt);
  }
  }
  catch (Exception)
  {
  throw;
  }
  return dt;
 }

Oracle_C#连接Oracle数据库

标签：dmi   oracle数据库   open()   data   string   select   roc   技术   exception   

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