6w学习笔记
vc控件的输入输出
单选按钮
当单击 RadioButton 控件时,其 Checked 属性设置为 true,并且调用 Click 事件处理程序。当 Checked 属性的值更改时,将引发 CheckedChanged 事件。如果 AutoCheck 属性设置为 true(默认值),则当选择单选按钮时,将自动清除该组中的所有其他单选按钮
输入
this.rdb_in.Checked = (bool)sqlDataReader["inorout"];
this.rdb_out.Checked = !(bool)sqlDataReader["inorout"];
输出
sqlConnection.Open();
if(this.rdb_Male.Checked==true)
string str = "update tb_book set inorout=1 where No=09187756";
else
string str = "update tb_book set inorout=0 where No=09187756";
日历控件
输入 this.dtp_BirthDate.Value(DateTime)sqlDataReader["publishDate"];
输出
sqlCommand1.Parameters.AddWithValue("@date", this.data.tostring);
文本框
输入this.txb_No.Text = sqlDataReader["No"].ToString();
输出sqlCommand1.Parameters.AddWithValue("@No", client.No);
网格视图控件 DataGridView
下拉列表控件ComboBox
输入 this.cmb_stock.SelectedValue = (int)sqlDataReader["stockNo"];
this.cmb_stock.DataSource = stockTable;
this.cmb_stock.DisplayMember = "Name";
this.cmb_stock.ValueMember = "No";
输出sqlCommand1.Parameters.AddWithValue("@stockNo",this.cmb_stock.SelectedValue.toString());
示例
建库语句
USE master; IF DB_ID('EduBaseDemo') IS NOT NULL BEGIN ALTER DATABASE EduBaseDemo SET SINGLE_USER WITH ROLLBACK IMMEDIATE; DROP DATABASE EduBaseDemo; END CREATE DATABASE EduBaseDemo ON (NAME='Datafile' ,FILENAME='C:\DataFile.mdf') LOG ON (NAME='Logfile' ,FILENAME='C:\Logfile.ldf'); GO USE EduBaseDemo; --创建表; ----班级表 CREATE TABLE tb_stock (No INT NOT NULL PRIMARY KEY ,Name VARCHAR(20) NOT NULL) INSERT tb_stock (No,Name) VALUES (1,'A馆') ,(2,'B馆') ,(3,'C馆') ,(4,'D馆'); ----学生表; CREATE TABLE tb_book (No CHAR(10) NOT NULL PRIMARY KEY ,Name VARCHAR(20) NOT NULL ,inorout BIT NOT NULL ,publishDate DATE NOT NULL ,stockNo INT NOT NULL ,Speciality VARCHAR(100) NULL); INSERT tb_book (No,Name,inorout,publishDate,stockNo,Speciality) VALUES ('09187756','内科学',1,'1991-10-15',2,'收藏'); select * from tb_book select * from tb_stock
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
//添加调用:
using System.Data.SqlClient; //包含访问SQL Server所需的各类对象; namespace lizi6w
{ public partial class frm_booktInfo : Form
{ /// <summary>
/// 公有方法:构造函数;
/// </summary>
public frm_bookInfo()
{
InitializeComponent();
this.StartPosition = FormStartPosition.CenterScreen; //本窗体启动位置设为屏幕*;
} /// <summary>
/// 私有方法:点击载入按钮;
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btn_Load_Click(object sender, EventArgs e)
{
SqlConnection sqlConnection = new SqlConnection();
sqlConnection.ConnectionString =
"Server=(local);Database=EduBaseDemo;Integrated Security=sspi";
SqlCommand sqlCommand = new SqlCommand();
SqlCommand sqlCommand2 = new SqlCommand();
sqlCommand.Connection = sqlConnection;
sqlCommand2.Connection = sqlConnection;
sqlCommand.CommandText = "SELECT * FROM tb_stock;";
sqlCommand2.CommandText = "SELECT * FROM tb_book WHERE No=@No;";
sqlCommand2.Parameters.AddWithValue("@No", "09187756");
SqlDataAdapter sqlDataAdapter = new SqlDataAdapter();
sqlDataAdapter.SelectCommand = sqlCommand;
DataTable classTable = new DataTable();
sqlConnection.Open();
sqlDataAdapter.Fill(classTable);
this.cmb_stock.DataSource = classTable;
this.cmb_stock.DisplayMember = "Name";
this.cmb_stock.ValueMember = "No";
SqlDataReader sqlDataReader = sqlCommand2.ExecuteReader(); if (sqlDataReader.Read())
{
this.txb_No.Text = sqlDataReader["No"].ToString();
this.txb_Name.Text = sqlDataReader["Name"].ToString();
this.rdb_inorout.Checked = (bool)sqlDataReader["inorout"];
this.rdb_inorout.Checked = !(bool)sqlDataReader["inorout"];
this.dtp_publishDate.Value = (DateTime)sqlDataReader["publishDate"];
this.cmb_stock.SelectedValue = (int)sqlDataReader["stockNo"];
this.txb_Speciality.Text = sqlDataReader["Speciality"].ToString();
}
sqlDataReader.Close(); //关闭数据阅读器(同时关闭连接);
}
}
}
例子2DataGridView
namespace 药品信息管理系统
{
public partial class frm_ClientTable : Form
{
public frm_ClientTable()
{
InitializeComponent();
this.StartPosition = FormStartPosition.CenterScreen;
} private void frm_ClientTable_Load(object sender, EventArgs e)
{ } private void btn_Load_Click(object sender, EventArgs e)
{
using (SqlConnection sqlConnection = new SqlConnection(DBHelper.connString))
{
SqlCommand sqlCommand = new SqlCommand();
//声明并实例化SQL命令;
sqlCommand.Connection = sqlConnection;
//将SQL命令的连接属性指向SQL连接;
sqlCommand.CommandText = "SELECT * FROM tb_Client;";
//指定SQL命令的命令文本;该命令查询所有学生;
SqlDataAdapter sqlDataAdapter = new SqlDataAdapter(); //声明并实例化SQL数据适配器;
sqlDataAdapter.SelectCommand = sqlCommand; //将SQL数据适配器的查询命令属性指向SQL命令;
DataTable ClientTable = new DataTable();
//声明并实例化数据表,用于保存所有学生,以用作数据网格视图的数据源;
sqlConnection.Open(); //打开SQL连接;
sqlDataAdapter.Fill(ClientTable);
//SQL数据适配器读取数据,并填充学生数据表;
sqlConnection.Close(); //关闭SQL连接;
this.dgv_Client.Columns.Clear(); //数据网格视图的列集合清空;
this.dgv_Client.DataSource = ClientTable; //将数据网格视图的数据源设为学生数据表;
this.dgv_Client.Columns["CNo"].HeaderText = "客户编号"; //将数据网格视图的指定列的表头文本设为中文;
this.dgv_Client.Columns["CName"].HeaderText = "客户名称";
this.dgv_Client.Columns["CAddress"].HeaderText = "地址";
this.dgv_Client.Columns["CTel"].HeaderText = "联系电话";
this.dgv_Client.Columns["CName"].AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill;
this.dgv_Client.Columns[this.dgv_Client.Columns.Count - ].AutoSizeMode = //数据网格视图的最后一列的自动调整列宽模式设为填充(至数据网格视图右侧边缘);
DataGridViewAutoSizeColumnMode.Fill; }
} private void btn_Update_Click(object sender, EventArgs e)
{
using (SqlConnection sqlConnection = new SqlConnection(DBHelper.connString))
{
SqlCommand sqlCommand = new SqlCommand(); //声明并实例化SQL命令;
sqlCommand.Connection = sqlConnection; //将SQL命令的连接属性指向SQL连接;
sqlCommand.CommandText = //指定SQL命令的命令文本;
"UPDATE tb_Client"
+ " SET CName=@CName,CAddress=@CAddress,CTel=@CTel"
+ " WHERE CNo=@CNo;"; sqlCommand.Parameters.Add("@CName", SqlDbType.VarChar, , "CName"); //向SQL命令的参数集合添加参数的名称、SQL Server数据类型、长度(仅用于定长类型)、所绑定的数据表中的列名;
sqlCommand.Parameters.Add("@CAddress", SqlDbType.VarChar, , "CAddress");
sqlCommand.Parameters.Add("@CTel", SqlDbType.VarChar, , "CTel");
sqlCommand.Parameters.Add("@CNo", SqlDbType.Char, , "CNo"); SqlDataAdapter sqlDataAdapter = new SqlDataAdapter(); //声明并实例化SQL数据适配器,同时借助构造函数,将其SelectCommand属性设为先前创建的SQL命令;
sqlDataAdapter.UpdateCommand = sqlCommand; //将SQL数据适配器的更新命令属性指向SQL命令;
DataTable ClientTable = (DataTable)this.dgv_Client.DataSource; //声明数据表,并指向数据网格视图的数据源;数据源默认类型为object,还需强制转换类型;
sqlConnection.Open(); //打开SQL连接;
int rowAffected = sqlDataAdapter.Update(ClientTable);
sqlConnection.Close();
if (rowAffected > )
{
MessageBox.Show("更新" + rowAffected.ToString() + "行。");
}
else
{
MessageBox.Show("not ok");
} //SQL数据适配器根据学生数据表提交更新,并返回受影响行数; }
} private void btn_Add_Click(object sender, EventArgs e)
{ //未完成
using (SqlConnection sqlConnection = new SqlConnection(DBHelper.connString))
{
SqlCommand sqlCommand = new SqlCommand(); //声明并实例化SQL命令;
sqlCommand.Connection = sqlConnection; //将SQL命令的连接属性指向SQL连接;
sqlCommand.CommandText = //指定SQL命令的命令文本;
"insert tb_Client (CNo,CName,CTel,CAddress)values"
+ "(@CNo,@CName,@CTel,@CAddress)"; sqlCommand.Parameters.Add("@CName", SqlDbType.VarChar, , "CName"); //向SQL命令的参数集合添加参数的名称、SQL Server数据类型、长度(仅用于定长类型)、所绑定的数据表中的列名;
sqlCommand.Parameters.Add("@CAddress", SqlDbType.VarChar, , "CAddress");
sqlCommand.Parameters.Add("@CTel", SqlDbType.VarChar, , "CTel");
sqlCommand.Parameters.Add("@CNo", SqlDbType.Char, , "CNo"); SqlDataAdapter sqlDataAdapter = new SqlDataAdapter(); //声明并实例化SQL数据适配器,同时借助构造函数,将其SelectCommand属性设为先前创建的SQL命令;
sqlDataAdapter.UpdateCommand = sqlCommand; //将SQL数据适配器的更新命令属性指向SQL命令;
DataTable ClientTable = (DataTable)this.dgv_Client.DataSource; //声明数据表,并指向数据网格视图的数据源;数据源默认类型为object,还需强制转换类型;
sqlConnection.Open(); //打开SQL连接;
int i = sqlCommand.ExecuteNonQuery();
if (i == )
{
MessageBox.Show("OK");
}
else
MessageBox.Show("not OK");
//int rowAffected = sqlDataAdapter.Update(ClientTable);
sqlConnection.Close();
MessageBox.Show("添加" + i.ToString() + "行。");
//SQL数据适配器根据学生数据表提交更新,并返回受影响行数; }
} private void btn_Delete_Click(object sender, EventArgs e)
{
//未完成
using (SqlConnection sqlConnection = new SqlConnection(DBHelper.connString))
{
SqlCommand sqlCommand = new SqlCommand(); //声明并实例化SQL命令;
sqlCommand.Connection = sqlConnection; //将SQL命令的连接属性指向SQL连接;
sqlCommand.CommandText = //指定SQL命令的命令文本;
"delete from tb_Client"
+ " WHERE CName='"+this.dgv_Client .CurrentRow .Cells [].ToString ()+"'";; //sqlCommand.Parameters.Add("@CName", SqlDbType.VarChar, 0, "CName"); //向SQL命令的参数集合添加参数的名称、SQL Server数据类型、长度(仅用于定长类型)、所绑定的数据表中的列名;
//sqlCommand.Parameters.Add("@CAddress", SqlDbType.VarChar, 0, "CAddress");
//sqlCommand.Parameters.Add("@CTel", SqlDbType.VarChar, 0, "CTel");
//sqlCommand.Parameters.Add("@CNo", SqlDbType.Char, 10, "CNo"); SqlDataAdapter sqlDataAdapter = new SqlDataAdapter(); //声明并实例化SQL数据适配器,同时借助构造函数,将其SelectCommand属性设为先前创建的SQL命令;
sqlDataAdapter.UpdateCommand = sqlCommand; //将SQL数据适配器的更新命令属性指向SQL命令;
DataTable ClientTable = (DataTable)this.dgv_Client.DataSource; //声明数据表,并指向数据网格视图的数据源;数据源默认类型为object,还需强制转换类型;
sqlConnection.Open(); //打开SQL连接;
int i = sqlCommand.ExecuteNonQuery();
if (i >)
{
MessageBox.Show("OK");
}
else
MessageBox.Show("not OK");
//int rowAffected = sqlDataAdapter.Update(ClientTable);
sqlConnection.Close();
MessageBox.Show("删除" + i.ToString() + "行。");
//SQL数据适配器根据学生数据表提交更新,并返回受影响行数; }
}
}
}