Dapper连接Oracle-白红宇

Dapper连接Oracle

阅读量：737 次

发布时间：2019-03-22

本文共 7946 字，大约阅读时间需要 26 分钟。

Dapper与Oracle开发实践

去年曾写过一篇《让Dapper支持Oracle》，回想起来，现在感到无地自容。这篇文章的初衷虽好，但却因当时技术水平的欠缺和信息查阅不够全面而犯了错误。如今经历了一段时间的学习和实践，终于明白了Dapper其实本身就支持Oracle，只是当时的理解和资源利用存在不足。现在将一份新的示例代码分享出来，希望能为开发者提供一些帮助。

数据库连接配置

首先，需要配置Oracle数据库连接。以下是标准代码示例：

using System;
using System.Collections.Generic;
using System.Linq;
using Dapper;
using System.Data.OracleClient;
using System.Data;
public class DapperFactory
{
    public static readonly string connection string = System.Configuration.ConfigurationManager.ConnectionStrings["Wip_TestConnStr"].ToString();
    public static OracleConnection CreateOracleConnection()
    {
        var connection = new OracleConnection(connectionString);
        connection.Open();
        return connection;
    }
}

简要说明：上述代码通过读取配置文件中的数据库连接字符串，建立了一个Oracle连接。CreateOracleConnection 方法负责连接数据库并返回一个OracleConnection 实例。

数据库操作

基于Oracle数据库，本文将展示增删改查（CRUD）操作的实现，包括事务处理和分页功能。以下是具体实现代码：

public class WUFEI_TESTTBRepository
{
    public bool AddWUFEI_TESTTB(WUFEI_TESTTBModel wufei_testtb)
    {
        using (OracleConnection conn = DapperFactory.CreateOracleConnection())
        {
            string executeSql = @"INSERT INTO WUFEI_TESTTB 
                                (USER_ID, USER_NAME, USER_ADDRESS, USER_SEX, USER_BIRTHDAY, USER_REMARK) 
                                VALUES (:USER_ID, :USER_NAME, :USER_ADDRESS, :USER_SEX, :USER_BIRTHDAY, :USER_REMARK)"; 
            return conn.Execute(executeSql, wufei_testtb) > 0 ? true : false;
        }
    }
    public int AddWUFEI_TestTbByTrans(List
   
     list)
    {
        using (OracleConnection conn = DapperFactory.CreateOracleConnection())
        {
            var transaction = conn.BeginTransaction();
            int row = 0;
            foreach (var item in list)
            {
                string executeSql = @"INSERT INTO WUFEI_TESTTB 
                                    (USER_ID, USER_NAME, USER_ADDRESS, USER_SEX, USER_BIRTHDAY, USER_REMARK) 
                                    VALUES (:USER_ID, :USER_NAME, :USER_ADDRESS, :USER_SEX, :USER_BIRTHDAY, :USER_REMARK)"; 
                row += conn.Execute(executeSql, item, transaction, null, null);
            }
            transaction.Commit();
            return row;
        }
    }
    public bool DeleteWUFEI_TESTTB(int USER_ID)
    {
        using (OracleConnection conn = DapperFactory.CreateOracleConnection())
        {
            string executeSql = @"DELETE FROM WUFEI_TESTTB WHERE USER_ID = :USER_ID";
            var condition = new { USER_ID = USER_ID };
            return conn.Execute(executeSql, condition) > 0 ? true : false;
        }
    }
    public bool EditWUFEI_TESTTB(WUFEI_TESTTBModel wufei_testtb)
    {
        using (OracleConnection conn = DapperFactory.CreateOracleConnection())
        {
            string executeSql = @"UPDATE WUFEI_TESTTB SET 
                                USER_NAME = :USER_NAME,
                                USER_ADDRESS = :USER_ADDRESS,
                                USER_SEX = :USER_SEX,
                                USER_BIRTHDAY = :USER_BIRTHDAY,
                                USER_REMARK = :USER_REMARK 
                                WHERE USER_ID = :USER_ID";
            return conn.Execute(executeSql, wufei_testtb) > 0 ? true : false;
        }
    }
    public bool UpdateWUFEI_TESTTB(string sqlStr)
    {
        using (OracleConnection conn = DapperFactory.CreateOracleConnection())
        {
            return conn.Execute(sqlStr) > 0 ? true : false;
        }
    }
    public WUFEI_TESTTBModel GetWUFEI_TESTTB(Decimal USER_ID)
    {
        using (OracleConnection conn = DapperFactory.CreateOracleConnection())
        {
            string executeSql = @"SELECT USER_ID, USER_NAME, USER_ADDRESS, USER_SEX, USER_BIRTHDAY, USER_REMARK 
                                FROM WUFEI_TESTTB 
                                WHERE USER_ID = :USER_ID";
            var condition = new { USER_ID = USER_ID };
            return conn.Query
    
     (executeSql, condition).SingleOrDefault();
        }
    }
    public KeyValuePair
     
      > WUFEI_TESTTBPaginationA(Pagination pagin, WUFEI_TESTTBModel condition)
    {
        using (OracleConnection conn = DapperFactory.CreateOracleConnection())
        {
            string executeQuery = String.Format(@"SELECT * FROM (
                SELECT table_source.*, ROWNUM AS rowno 
                FROM (
                    SELECT USER_ID, USER_NAME, USER_ADDRESS, USER_SEX, USER_BIRTHDAY, USER_REMARK 
                    FROM WUFEI_TESTTB 
                    WHERE 1 = 1 {0}
                ) table_source 
                WHERE ROWNUM <= ({1} * {2})
            ) table_alias 
            WHERE table_alias.rowno > ((({1} - 1) * {2}) + 1)", pagin.CurrentPageIndex, pagin.PageSize, conditionStr);
            
            string executeCount = String.Format("SELECT COUNT(1) AS CountNum FROM WUFEI_TESTTB WHERE 1 = 1 {0}", conditionStr);
            var mixCondition = new { CurrentPageIndex = pagin.CurrentPageIndex, PageSize = pagin.PageSize };
            var listScore = conn.Query
      
       (executeQuery, mixCondition).ToList();
            pagin.TotalItemCount = conn.Query
       
        (executeCount, mixCondition).SingleOrDefault();
            return new KeyValuePair
        
         >(pagin, listScore); } } public KeyValuePair
         
          > WUFEI_TESTTBPagination(Pagination pagin, WUFEI_TESTTBModel condition) { using (OracleConnection conn = DapperFactory.CreateOracleConnection()) { string conditionStr = ""; string orderBy = "USER_ID DESC"; if (!string.IsNullOrEmpty(pagin.OrderBy)) { orderBy = pagin.OrderBy; } string executeQuery = String.Format(@"SELECT * FROM ( SELECT table_source.*, ROWNUM AS rowno FROM ( SELECT USER_ID, USER_NAME, USER_ADDRESS, USER_SEX, USER_BIRTHDAY, USER_REMARK FROM WUFEI_TESTTB WHERE 1 = 1 {0} ) table_source WHERE ROWNUM <= ({1} * {2}) ) table_alias WHERE table_alias.rowno > ((({1} - 1) * {2}) + 1)", conditionStr, orderBy); string executeCount = String.Format("SELECT COUNT(*) AS CountNum FROM WUFEI_TESTTB WHERE 1 = 1 {0}", conditionStr); var mixCondition = new { CurrentPageIndex = pagin.CurrentPageIndex, PageSize = pagin.PageSize }; var listScore = conn.Query
          
           (executeQuery, mixCondition).ToList(); pagin.TotalItemCount = conn.Query
           
            (executeCount, mixCondition).SingleOrDefault(); return new KeyValuePair
            
             >(pagin, listScore); } } }

实体类模型

以下是与数据库表对应的实体类模型：

using System;
using System.Data;
using System.Collections;
using System.Xml;
using System.Runtime.Serialization;
namespace Tcl.ForLog.Model
{
    [DataContract(Name = "WUFEI_TESTTB")]
    public class WUFEI_TESTTBModel
    {
        public const string TABLE_NAME = "WUFEI_TESTTB";
        [DataMember(Name = "USER_ID")]
        public decimal USER_ID { get; set; }
        [DataMember(Name = "USER_NAME")]
        public string USER_NAME { get; set; }
        [DataMember(Name = "USER_ADDRESS")]
        public string USER_ADDRESS { get; set; }
        [DataMember(Name = "USER_SEX")]
        public string USER_SEX { get; set; }
        [DataMember(Name = "USER_BIRTHDAY")]
        public DateTime USER_BIRTHDAY { get; set; }
        [DataMember(Name = "USER_REMARK")]
        public string USER_REMARK { get; set; }
        public static WUFEI_TESTTBModel DeepCopy(WUFEI_TESTTBModel testTbA)
        {
            var testTbB = new WUFEI_TESTTBModel();
            testTbB.USER_ID = testTbA.USER_ID;
            testTbB.USER_NAME = testTbA.USER_NAME;
            testTbB.USER_ADDRESS = testTbA.USER_ADDRESS;
            testTbB.USER_SEX = testTbA.USER_SEX;
            testTbB.USER_BIRTHDAY = testTbA.USER_BIRTHDAY;
            testTbB.USER_REMARK = testTbA.USER_REMARK;
            return testTbB;
        }
    }
}

技术说明

以上代码以WUFEI_TESTTB表为例，展示了基于Dapper的Oracle数据库开发实践。通过上述代码，可以完成用户数据的增删改查操作，同时支持事务处理和分页功能。WUFEI_TESTTBModel类则是对应的实体类模型，用于数据传输和处理。

代码生成工具

需要注意的是，本文中的代码主要通过CodeSmith生成，这是一种强大的代码生成工具，能够显著提升开发效率。如果本文的内容对您有所帮助，请记得推荐和分享。

转载声明

转载自：https://www.cnblogs.com/ushou/p/3359973.html

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