sqlcommand_重用SqlCommand？_优化SqlCommand的使用 - 腾讯云开发者社区

在.NET 2.0 PDC或Beta1中，可以看到SqlCommand对象新增了个ExecutePageReader方法，该方法实现了分页读取数据的功能。...;database=Northwind;Trusted_Connection=yes"); SqlCommand cmd = new SqlCommand(command, conn)...在ADO.NET 2.0 PDC/Beta1中，用SqlCommand.ExecutePageReader进行数据分页： SqlDataReader GetPageReader(int pageNumber...;database=Northwind;Trusted_Connection=yes"); SqlCommand cmd = new SqlCommand(command, conn)

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C#数据库操作的3种典型用法

sqlCommand = new SqlCommand(); sqlCommand.CommandType = System.Data.CommandType.Text; sqlCommand.Connection...= sqlCommand.ExecuteReader(); while(sqlDataReader.Read()) { //Get KeywordID and KeywordName , You...sqlCommand = new SqlCommand(); sqlCommand.CommandType = CommandType.StoredProcedure; sqlCommand.Connection...= sqlConnection; sqlCommand.CommandText = storedProcedureName; sqlConnection.Open(); sqlCommand.ExecuteNonQuery...sqlCommand = new SqlCommand(); sqlCommand.CommandType = System.Data.CommandType.Text; sqlCommand.Connection

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C#操作sql通用类 SQLHelper

命令中用到的参数列表 /// 返回一个数值表示此SqlCommand命令执行后影响的行数 public static int ExecuteNonQuery...cmd = new SqlCommand(); using (SqlConnection conn = new SqlConnection(connectionString)) {...//通过PrePareCommand方法将参数逐个加入到SqlCommand的参数集合中 PrepareCommand(cmd, conn, null, cmdType,...cmdText, commandParameters); int val = cmd.ExecuteNonQuery(); //清空SqlCommand中的参数列表...cmd = new SqlCommand(); PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters

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CA3001：查看 SQL 注入漏洞的代码

sqlCommand = new SqlCommand() { CommandText = "SELECT ProductId...As SqlCommand = New SqlCommand With {.CommandText = "SELECT ProductId FROM Products WHERE ProductName...sqlCommand = new SqlCommand() { CommandText = "SELECT ProductId...As SqlCommand = New SqlCommand With {.CommandText = "SELECT ProductId FROM Products WHERE ProductName...sqlCommand = new SqlCommand() { CommandText = "sp_GetProductIdFromName

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数据库命令的应用

.SQL命令 SqlCommand SqlCommand负责完成对数据库的查询、添加、删除和修改等各种操作。...SqlCommand对象的创建 SqlCommand sqlcom = new SqlCommand() sqlCom.Connection = sqlConn;...//再将SQL命令的属性Connection指向SQL连接或 SqlCommand sqlCom = new SqlCommand(命令字符串，连接对象名); SqlCommand对象的三种常用的命令格式...sqlCommand = new SqlCommand(); //声明并实例化SQL命令； sqlCommand.Connection...sqlCommand = new SqlCommand(); //声明并实例化SQL命令； sqlCommand.Connection

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自定义 SqlHelp

cmd = new SqlCommand(); 32 CommandBuilder(cmdText, cmd, conn, parameters); 33...cmd = new SqlCommand(); 52 CommandBuilder(cmdText, cmd, conn); 53 SqlDataReader...cmd = new SqlCommand(); 94 CommandBuilder(cmdText, cmd, conn); 95...cmd = new SqlCommand(); 141 CommandBuilder(cmdText, cmd, conn); 142...cmd = new SqlCommand(); 239 CommandBuilder(cmdText, cmd, conn); 240

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sqlserver 的事务和c#的事务

SqlTransaction objtran; 7 objtran = sqlcon.BeginTransaction("Method"); 8 SqlCommand...objcmd = new SqlCommand(); 9 objcmd.Connection = sqlcon; 10 objcmd.Transaction..._sqlCommand = new SqlCommand(); _sqlCommand.Connection = _strCon;..._sqlCommand.Transaction = _sqlTransaction; try {..._sqlCommand.CommandText = "insert into PointTcpData (PointTcpData_pointID,PointTcpData_X,PointTcpData_Y

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TransactionScope和Enterprise Libray 3.0 Data Access Application Block

= "CreditAccount" DbCommand creditCommand = db.GetStoredProcCommand(sqlCommand); db.AddInParameter...= "DebitAccount" DbCommand debitCommand = db.GetStoredProcCommand(sqlCommand); db.AddInParameter(debitCommand...= "CreditAccount" DbCommand creditCommand = db.GetStoredProcCommand(sqlCommand); db.AddInParameter...} private void TestCommand2(Database db, int transactionAmount, int destinationAccount) { string sqlCommand...= "DebitAccount" DbCommand debitCommand = db.GetStoredProcCommand(sqlCommand); db.AddInParameter(debitCommand

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ADO数据库C#中ExecuteReader、ExecuteNonQuery、ExecuteScalar、SqlDataReader、SqlDataAdapter

{ using (SqlConnection conn = new SqlConnection(connectionString)) { SqlCommand...cmd = new SqlCommand(); cmd.Connection = conn; cmd.CommandType = commandType...cmd = new SqlCommand(); cmd.Connection = conn; cmd.CommandType = commandType...SqlCommand cmd = new SqlCommand("select * from stu", conn); conn.Open(); SqlDataReader...cmd = new SqlCommand("select * from stu", conn); conn.Open(); SqlDataReader

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C# devExpress GridControl 行中行子行多级行

demo，大家不要拘泥于数据 DB db = new DB(); DataSet ds = new System.Data.DataSet(); SqlCommand...comm2 = new SqlCommand(sql, db.getSqlConnection()); //db.getSqlConnection() 返回一个sqlConnection 对象...SqlCommand comm3 = new SqlCommand(sql1, db.getSqlConnection()); SqlCommand comm4 = new SqlCommand

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ADO.NET-DataReader读取数据

connString); string sql = "select StudentId,StudentName,Gender from Students"; SqlCommand...sqlCommand = new SqlCommand(sql,conn); //打开连接 conn.Open(); //执行查询方法...，返回DataReader对象 SqlDataReader objRader = sqlCommand.ExecuteReader(); //读取数据...StudentId,StudentName,Gender from Students;Select ClassId,ClassName from StudentClass"; SqlCommand...sqlCommand = new SqlCommand(sql,conn); //打开连接 conn.Open(); //执行查询方法

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将Excel文件数据库导入SQL Server

+ "/"" + " -P" + "/"" + "/"" + "/'"; try { sqlConnection1.Open(); //SqlCommand... sqlCommand1 = new SqlCommand(); //sqlCommand1.Connection = sqlConnection1; //sqlCommand1....CommandText = importSQL; //sqlCommand1.ExecuteNonQuery(); //MessageBox.Show("import...; SqlCommand sqlCommand2 = new SqlCommand(); sqlCommand2.Connection = sqlConnection1...; sqlCommand2.CommandText = exportSQL; sqlCommand2.ExecuteNonQuery(); MessageBox.Show

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浅谈ADO.NET中的对象——Connection、Command、DataReader、DataAdapter、DataSet、DataTable

】从字面上来看就会理解SqlCommand就是一个命令，当与数据库建立连接之后，就可以用SqlCommand来对数据库进行增删改查、执行存储过程等。 ...SqlCommand常用的方法有： ◆ ExecuteNonQuery()：返回值为整形，表示对数据库进行增删改后，数据库所影响的行数，也可以直接执行。...更多关于SqlCommand的细节可以参考MSDN：SqlCommand 类【SqlDataReader】 SqlDataReader主要与SqlCommand结合使用用来快速读取，并且这种读取只能...创建：SqlDataReader只能由SqlCommand对象的ExecuteReader()方法创建。 ...SqlDataReader通常和SqlCommand一同使用，常用语简单浏览并且耗时较短的数据库操作。

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TransactionScope使用说明

database=northwind")) { conOne.Open(); SqlCommand...database=pubs")) { conTwo.Open(); SqlCommand... command = new SqlCommand("update jobs set job_desc='chen' where job_id='1'", conTwo); ...;uid=sa;pwd=123;database=pubs"); SqlCommand commandNorthwind = new SqlCommand(); ...SqlCommand commandPubs = new SqlCommand(); try { conNorthwind.Open

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使用C#进行数据库增删改查(一)

SqlComand这个类需要传入sql语句和连接对象，代码如下： SqlCommand command=new SqlCommand("此处是sql语句",connection); 在将具体的增删改查之前...以上代码的运行结果为：插入，更新，删除：把这三个放在一块是因为这三个在代码表现层面是一致的，都是调用SqlCommand的ExecuteNonQuery()方法，该方法返回int类型的数据...command = new SqlCommand (sql, connection)) { try { if (parameters !...command = new SqlCommand (sql, connection)) { try {...command = new SqlCommand (sql, connection)) { try {

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C#结合数据库开发通讯录管理系统

com = new SqlCommand(sqlcom, con); con.Open(); SqlDataReader reader...com2 = new SqlCommand(sqlcom2, con); int eq=com2.ExecuteNonQuery(); if(eq!...com = new SqlCommand(sqlcom, con); con.Open(); int eq = com.ExecuteNonQuery(...com = new SqlCommand(sqlcom, con); con.Open(); int eq=com.ExecuteNonQuery();...com = new SqlCommand(sqlcom, con); con.Open(); int eq = com.ExecuteNonQuery(

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TransactionScope使用说明

只要任意一个 SqlCommand 对象引发异常，程序流控制就会跳出 TransactionScope 的 using 语句块，随后，TransactionScope 将自行释放并回滚该事务。...cmd= new SqlCommand(sqlUpdate, cn2005); cn2005.Open(); cmd.ExecuteNonQuery(); } using (SqlConnection...cn2005= new SqlConnection(anotherSql2005)) { SqlCommand cmd= new SqlCommand(sqlDelete, cn2005); cn2005...cmd= new SqlCommand(updateSql1, cn2005); cn2005.Open(); cmd.ExecuteNonQuery(); } tsCope.Complete();...cmd= new SqlCommand(updateSql2, cn2005); cn2005.Open(); cmd.ExecuteNonQuery(); } ts.Complete(); } }

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ADO.NET 通用数据访问类使用

cmd = new SqlCommand(sql, conn); conn.Open(); object result =cmd.ExecuteScalar...Update(string sql) { SqlConnection conn = new SqlConnection(connString); SqlCommand...cmd = new SqlCommand(sql, conn); conn.Open(); int result = cmd.ExecuteNonQuery...GetReader(string sql) { SqlConnection conn = new SqlConnection(connString); SqlCommand...cmd = new SqlCommand(sql, conn); conn.Open(); //CommandBehavior.CloseConnection

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关于【ExecuteReader: Connection 属性尚未初始化】的错误提示解决方案「建议收藏」

遇到这种错误，很大概率是因为缺少SqlCommand里的两个参数。...找到【SqlCommand mycmd = new SqlCommand();】这条语句， SqlCommand（）有两个带传入的参数：一个是定义查询语句的sql，另一个是定义数据库连接的conn

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.NET开发中的事务处理大比拼

) { conn.Open(); using (SqlTransaction tran = conn.BeginTransaction()) { using (SqlCommand...cmd = new SqlCommand()) { cmd.Connection = conn; cmd.CommandType = CommandType.Text...using (TransactionScope ts = new TransactionScope()) { conn.Open(); using (SqlCommand...;uid=sa;pwd=sa;database=db.mdf;"); SqlCommand cmd = new SqlCommand("update users set name = '...myCommand = new SqlCommand(); myCommand.Connection = myConnection;

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ADO.NET 2.0中的SqlCommand.ExecutePageReader

C#数据库操作的3种典型用法

C#操作sql通用类 SQLHelper

CA3001：查看 SQL 注入漏洞的代码

数据库命令的应用

自定义 SqlHelp

sqlserver 的事务和c#的事务

TransactionScope和Enterprise Libray 3.0 Data Access Application Block

ADO数据库C#中ExecuteReader、ExecuteNonQuery、ExecuteScalar、SqlDataReader、SqlDataAdapter

C# devExpress GridControl 行中行子行多级行

ADO.NET-DataReader读取数据

将Excel文件数据库导入SQL Server

浅谈ADO.NET中的对象——Connection、Command、DataReader、DataAdapter、DataSet、DataTable

TransactionScope使用说明

使用C#进行数据库增删改查(一)

C#结合数据库开发通讯录管理系统

TransactionScope使用说明

ADO.NET 通用数据访问类使用

关于【ExecuteReader: Connection 属性尚未初始化】的错误提示解决方案「建议收藏」

.NET开发中的事务处理大比拼

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