基于委托的Oracle数据库连接
2022/7/21 2:24:53
本文主要是介绍基于委托的Oracle数据库连接,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!
基于委托的Oracle数据库连接
1、引入包
Oracle.ManagedDataAccess.dll
System.Configuration
Newtonsoft.Json
2、App.config
<?xml version="1.0" encoding="utf-8" ?> <configuration> <startup> <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2" /> </startup> <appSettings> <add key="oracleServer" value="localhost"/> <add key="database" value="net"/> <add key="user" value="system"/> <add key="pwd" value="manager"/> </appSettings> </configuration>
3、OracleDbHelper
public class OracleDbHelper { public static readonly string oracleServer = ConfigurationManager.AppSettings["oracleServer"]; public static readonly string dataBase = ConfigurationManager.AppSettings["database"]; public static readonly string user = ConfigurationManager.AppSettings["user"]; public static readonly string password = ConfigurationManager.AppSettings["pwd"]; //数据库连接字符串(app.config来配置),可以动态更改connectionString支持多数据库. //public static readonly string connectionString = ConfigurationManager.AppSettings["OraConnString"]; public static readonly string connectionString = $"Data Source=(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST={oracleServer})(PORT=1521))(CONNECT_DATA=(SERVICE_NAME={dataBase})));User Id = {user}; Password={password};"; /// <summary> /// 利用委托封装的Oracle访问通用类 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="sql"></param> /// <param name="func"></param> /// <returns></returns> private static T Execute<T>(string sql,Func<OracleCommand,T> func) { using (OracleConnection conn = new OracleConnection(connectionString)) { using (OracleCommand cmd = new OracleCommand(sql, conn)) { conn.Open(); OracleTransaction transaction = conn.BeginTransaction(); try { T tResult = func.Invoke(cmd); // 提交数据 transaction.Commit(); return tResult; } catch (OracleException ex) { // 出现异常是回滚 transaction.Rollback(); throw new Exception(ex.Message); } } } } /// <summary> /// 执行一条计算查询结果语句,返回查询结果 /// </summary> /// <param name="sql"></param> /// <returns></returns> public static object ExecuteScalar(string sql) { Func<OracleCommand, object> func = new Func<OracleCommand, object>( cmd => { return cmd.ExecuteScalar(); } ); return Execute<object>(sql,func); } public static int ExecuteNonQuery(string sql) { Func<OracleCommand, int> func = new Func<OracleCommand, int>( cmd => { return cmd.ExecuteNonQuery(); } ); return Execute<int>(sql, func); } /// <summary> /// 查询数据 /// </summary> /// <param name="sql"></param> /// <returns></returns> public static DataSet Query(string sql) { Func<OracleCommand, DataSet> func = new Func<OracleCommand, DataSet>( cmd => { DataSet ds = new DataSet(); OracleDataAdapter adapter = new OracleDataAdapter(cmd); adapter.Fill(ds, "data"); return ds; } ); return Execute<DataSet>(sql, func); } }
4、测试
// 1、执行一条计算查询结果语句,返回查询结果 string sql = $"select count(1) from staff_dict"; object rows = OracleHelper.ExecuteScalar(sql); Console.WriteLine(rows); Console.ReadKey(); // 测试更新 string sql = "update staff_dict t set t.status = 1 where t.emp_no = '0650'"; int rows = OracleDbHelper.ExecuteNonQuery(sql); Console.WriteLine(rows); Console.ReadKey(); // 测试查询 string sql = "select * from staff_dict t where t.emp_no like '065%'"; DataSet data = OracleDbHelper.Query(sql); Console.WriteLine(JsonConvert.SerializeObject(data)); Console.ReadKey();
这篇关于基于委托的Oracle数据库连接的文章就介绍到这儿,希望我们推荐的文章对大家有所帮助,也希望大家多多支持为之网!
- 2024-05-13PingCAP 戴涛:构建面向未来的金融核心系统
- 2024-05-09flutter3.x_macos桌面os实战
- 2024-05-09Rust中的并发性:Sync 和 Send Traits
- 2024-05-08使用Ollama和OpenWebUI在CPU上玩转Meta Llama3-8B
- 2024-05-08完工标准(DoD)与验收条件(AC)究竟有什么不同?
- 2024-05-084万 star 的 NocoDB 在 sealos 上一键起,轻松把数据库编程智能表格
- 2024-05-08Mac 版Stable Diffusion WebUI的安装
- 2024-05-08解锁CodeGeeX智能问答中3项独有的隐藏技能
- 2024-05-08RAG算法优化+新增代码仓库支持,CodeGeeX的@repo功能效果提升
- 2024-05-08代码报错不用愁,CodeGeeX一键完成代码修复、错误解释的功能上线了!