using DeveloperSharp.Framework.QueryEngine; -------------------------- DatabaseInfo DIF; DIF.DatabaseType = DatabaseType.SQLServer; //设置数据库类型 DIF.ConnectionString = "Server=localhost;Database=YZZ;Uid=sa;Pwd=123"; IDataAccess IDA = DataAccessFactory.Create(DIF);注意:通过对DatabaseType属性的设定,提供了对所有种类数据库的支持(包括:MySql、Oracle、PostgreSQL、SqlServer、Sqlite、Firebird、达梦、以及人大金仓KingbaseES、神舟通用, 南大通用, 翰高, Access、等)
//查询多数据 var Students1 = IDA.SqlExecute<stu>("select * from t_Student"); //查询多数据(带参数) var Students2 = IDA.SqlExecute<stu>("select * from t_Student where Id>@IdMin and Name like @LikeName", new { IdMin = 2, LikeName = "%周%" }); //另一种写法1 var IdMin = IDA.CreateParameterInput("IdMin", DbType.Int32, 2); var LikeName = IDA.CreateParameterInput("LikeName", DbType.String, 50, "%周%"); var Students3 = IDA.SqlExecute<stu>("select * from t_Student where Id>@IdMin and Name like @LikeName", LikeName, IdMin); //另一种写法2 var Students4 = IDA.SqlExecute<stu>("select * from t_Student").Where(t => t.Id > 2 && t.Name.Contains("周")); //选出单数据 var OneStudent = Students2.FirstOrDefault();其中stu实体类代码如下形式:
public class stu { public int Id { get; set; } public string Name { get; set; } public int Age { get; set; } } //此实体类中的Id、Name、Age属性名,要与数据表中的Id、Name、Age字段名对应注意:(1)DbType类型的命名空间是System.Data
using DeveloperSharp.Extension;//调用“分页功能”需要引用此命名空间 -------------------------- var Page1 = Students1.PagePartition(20, 5); var Page2 = Students2.PagePartition(20, 5); //一气呵成的写法 var Page3 = IDA.SqlExecute<stu>("select * from t_Student").PagePartition(20, 5);分页后获得的PagePiece对象中所包含的各类属性/参数,可参看这篇文章:高效分页
try { //开启事务 IDA.TransactionBegin(); //修改数据(多语句) int affectedRows1 = IDA.SqlExecute("insert into t_Student(Name,Age)values('ww','96');update t_Student set Age=100 where Id=1006"); //修改数据(带参数) int affectedRows2 = IDA.SqlExecute("insert into t_Student(Name,Age)values(@N,@A)", new { N = "孙悟空", A = 200 }); //另一种写法 var NewAge = IDA.CreateParameterInput("NewAge", DbType.Int32, 200); var NewName = IDA.CreateParameterInput("NewName", DbType.String, 50, "孙悟空"); int affectedRows3 = IDA.SqlExecute("insert into t_Student(Name,Age)values(@NewName,@NewAge)", NewName, NewAge); //完成事务 IDA.TransactionCommit(); } catch { //回滚事务 IDA.TransactionRollBack(); }【示例4:输出参数】
var op1 = IDA.CreateParameterOutput("TotalCount", DbType.Int32);//此项为输出参数 var op2 = IDA.CreateParameterOutput("MyName", DbType.String, 50);//此项为输出参数 //以下sql语句混杂了多个“输入”与“输出”参数,注意看 IDA.SqlExecute("insert into Friend(Birth,Name,height)values(@B,@N,@h);" + "select @TotalCount=count(*) from Friend;" + "select @MyName=Name from Friend where Id=@Id", new { N = "杨小伟", B = "1999-02-28 12:03:45", h = 11.023, Id = 2 }, op1, op2); int tc = Convert.ToInt32(op1.Value); string mn = op2.Value.ToString();【示例5:存储过程】
CREATE PROCEDURE Test5 @B as datetime, @N as nvarchar(50), @h as float, @TotalCount as int output, @MyName as nvarchar(50) output, @Id as int AS BEGIN insert into Friend(Birth,Name,height)values(@B,@N,@h); select @TotalCount=count(*) from Friend; select @MyName=Name from Friend where Id=@Id; return @TotalCount+100; END调用该存储过程的示例代码如下:
var op1 = IDA.CreateParameterOutput("TotalCount", DbType.Int32);//输出参数 var op2 = IDA.CreateParameterOutput("MyName", DbType.String, 50);//输出参数 var op3 = IDA.CreateParameterReturn();//返回参数 IDA.SpExecute("Test5", new { N = "杨小伟", B = "1999-02-28 12:03:45", h = 11.023, Id = 2 }, op1, op2, op3); int tc = Convert.ToInt32(op1.Value); string mn = op2.Value.ToString(); int ret = Convert.ToInt32(op3.Value);学习+灵活使用以上5个示例,就能满足几乎所有的数据操作需求,且操作十分简易。
声明:
IEnumerable<T> SqlExecute<T>(string cmdText, params IDataParameter[] Params) where T : class, new()用途:执行Sql语句(Select类)
声明:
IEnumerable<T> SqlExecute<T>(string cmdText, object InputParams, params IDataParameter[] Params) where T : class, new()用途:执行Sql语句(Select类)
声明:
int SqlExecute(string cmdText, params IDataParameter[] Params)用途:执行Sql语句(Insert/Update/Delete类)
声明:
int SqlExecute(string cmdText, object InputParams, params IDataParameter[] Params)用途:执行Sql语句(Insert/Update/Delete类)
声明:
IEnumerable<T> SpExecute<T>(string cmdText, params IDataParameter[] Params) where T : class, new()用途:执行Sp存储过程(Select类)
声明:
IEnumerable<T> SpExecute<T>(string cmdText, object InputParams, params IDataParameter[] Params) where T : class, new()用途:执行Sp存储过程(Select类)