C#连接Oracle数据库字符串(引入DLL)

https://www.cnblogs.com/chenyanbin/p/11324614.html

需求：从一台Oracle数据库获取数据，本以为是很简单的事情，直接将原来的SqlClient换成OracleClient调用，结果远没自己想的简单。要么安装Oracle客户端，要么安装PLSQL。网上这方面搜索后，太多的文章，还要不停的去测试。最后找个引入外部类库的方式。这个DLL其实是Oracle为C#专门提供的，在它的官方也可以下载到（不过找起来很麻烦）。

这里我就把这个方案和dll分享给大家。

链接：https://pan.baidu.com/s/17saKNnBVyDvMbt1L8lSf6A
提取码：sr97

DEMO示例#

using Oracle.ManagedDataAccess.Client; //引入命名空间
    </span><span style="color: rgba(0, 0, 255, 1)">private</span> <span style="color: rgba(0, 0, 255, 1)">void</span> button1_Click(<span style="color: rgba(0, 0, 255, 1)">object</span><span style="color: rgba(0, 0, 0, 1)"> sender, EventArgs e)
    {
        </span><span style="color: rgba(0, 0, 255, 1)">string</span> strSql = <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">select * from s_user</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">;
        DataTable dt </span>=<span style="color: rgba(0, 0, 0, 1)"> QueryDt(strSql);
    }

//Oracle连接字符串

private static string strconn = "Data Source=(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=172.30.0.37)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=EMES)));Persist Security Info=True;User ID=EMES_DEV;Password=EMES_DEV;";
    </span><span style="color: rgba(0, 0, 255, 1)">private</span> DataTable QueryDt(<span style="color: rgba(0, 0, 255, 1)">string</span><span style="color: rgba(0, 0, 0, 1)"> sql)
    {
        </span><span style="color: rgba(0, 0, 255, 1)">using</span> (OracleConnection conn = <span style="color: rgba(0, 0, 255, 1)">new</span><span style="color: rgba(0, 0, 0, 1)"> OracleConnection(strconn))
        {
            </span><span style="color: rgba(0, 0, 255, 1)">try</span><span style="color: rgba(0, 0, 0, 1)">
            {
                </span><span style="color: rgba(0, 0, 255, 1)">if</span> (conn.State !=<span style="color: rgba(0, 0, 0, 1)"> ConnectionState.Open)
                {
                    conn.Open();
                }
                OracleDataAdapter adap </span>= <span style="color: rgba(0, 0, 255, 1)">new</span><span style="color: rgba(0, 0, 0, 1)"> OracleDataAdapter(sql, conn);
                DataTable dt </span>= <span style="color: rgba(0, 0, 255, 1)">new</span><span style="color: rgba(0, 0, 0, 1)"> DataTable();
                adap.Fill(dt);
                </span><span style="color: rgba(0, 0, 255, 1)">return</span><span style="color: rgba(0, 0, 0, 1)"> dt;
            }
            </span><span style="color: rgba(0, 0, 255, 1)">catch</span><span style="color: rgba(0, 0, 0, 1)"> (Exception ex)
            {
                </span><span style="color: rgba(0, 0, 255, 1)">return</span> <span style="color: rgba(0, 0, 255, 1)">null</span><span style="color: rgba(0, 0, 0, 1)">;
            }
            </span><span style="color: rgba(0, 0, 255, 1)">finally</span><span style="color: rgba(0, 0, 0, 1)">
            {
                conn.Close();
            }
        }
    }</span></pre>

连接字符串格式:#

1 格式:
2 string strconn = "Data Source=(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=172.30.0.37)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=EMES)));Persist Security Info=True;User ID=EMES_DEV;Password=EMES_DEV;";
3 
4 格式:
5 string strconn = "Data Source=(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=远程服务器IP地址)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=远程服务器数据库服务名称)));Persist Security Info=True;User ID=数据库用户名;Password=数据库密码;";