Oracle.DataAccess.Client 驱动 和 OleDB 调用Oracle 函数的区别

Oracle.DataAccess.Client 驱动 和 OleDB 调用Oracle 函数的区别主要体现在两个方面

1 命令文本的区别

CommandText:

Oracle.DataAccess.Client 驱动：

OracleCommand.CommandText ="Oracle函数名"

OleDB 驱动：

OleDBCommand.CommandText ="{ ? = call oracle函数名(?,?)}"

2 命令类型的区别 

CommandType

目录

Oracle.DataAccess.Client 驱动 和 OleDB 调用Oracle 函数的区别

1 命令文本的区别

2 命令类型的区别 

3 代码示列：

---

Oracle.DataAccess.Client 驱动：

OracleCommand.CommandType = CommandType.StoredProcedure;

OleDB 驱动：

OleDBCommand.CommandType = CommandType.Text;

3 代码示列：

using System;
using Oracle.DataAccess.Client;
using System.Data.OleDb;
using System.Data;

class Program

{
    //Oracle.DataAccess.Client;
    public void ExecuteOracleProcedure()

    {

        string oradb = "User Id=yourUsername;Password=yourPassword;Data Source=yourDataSource";

        OracleConnection conn = new OracleConnection(oradb);

        conn.Open();

        //OracleCommand.CommandText ="Oracle函数名"；

        OracleCommand cmd = new OracleCommand("GET_EMPLOYEE_NAME", conn);

        //此处为 CommandType 取值CommandType.StoredProcedure，不能取CommandType.Text

        cmd.CommandType = CommandType.StoredProcedure;

        // 添加输入参数

        cmd.Parameters.Add("EMPLOYEE_ID", OracleDbType.Int32).Value = 123;

        // 添加输出参数

        cmd.Parameters.Add("EMPLOYEE_NAME", OracleDbType.Varchar2, ParameterDirection.Output).Size = 100;

        cmd.ExecuteNonQuery();

        // 获取输出参数的值

        string employeeName = cmd.Parameters["EMPLOYEE_NAME"].Value.ToString();

        Console.WriteLine("Employee Name: " + employeeName);

        conn.Close();

    }

    //oledb
    public void ExecuteOleDBProcedure()

    {

        string oradb = "Provider=OraOLEDB.Oracle.1;User Id=yourUsername;Password=yourPassword;Data Source=yourDataSource";
     
        OleDbConnection conn = new OleDbConnection(oradb);

        conn.Open();

        //OleDBCommand.CommandText ="{ ? = call oracle函数名(?,?)}"；函数有几个参数就添加几个问号，问号有“,”隔开

        OleDbCommand cmd = new OleDbCommand("{ ? = call GET_EMPLOYEE_NAME(?,?)}", conn);

        //此处为 CommandType 取值CommandType.Text

        cmd.CommandType = CommandType.Text;

        // 添加输入参数

        cmd.Parameters.Add("EMPLOYEE_ID", OleDbType.Integer).Value = 123;
        cmd.Parameters["EMPLOYEE_ID"].Direction = ParameterDirection.Input;
        // 添加输出参数

        cmd.Parameters.Add("EMPLOYEE_NAME", OleDbType.VarChar).Size = 100;
        cmd.Parameters["EMPLOYEE_NAME"].Direction = ParameterDirection.Output;
        cmd.ExecuteNonQuery();

        // 获取输出参数的值

        string employeeName = cmd.Parameters["EMPLOYEE_NAME"].Value.ToString();

        Console.WriteLine("Employee Name: " + employeeName);

        conn.Close();

    }

}