C#与SQL server 的连接
数据库的服务器
管理员信息表
学生信息表
一、登陆窗口
源代码：
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient; //此处的应用是必要的
namespace 数据库
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
textBox2.PasswordChar='*'; //把密码设为隐藏的
}
private void button2_Click(object sender, EventArgs e)
{
textBox1.Text = "";
textBox2.Text = "";
textBox1.Focus();
}
private void button1_Click(object sender, EventArgs e)
{
if (textBox1.Text == ""&&textBox2.Text=="")
{
MessageBox.Show("请输入管理员的账户和密码！");
textBox1.Focus();
}
else
{
if (textBox1.Text == "" && textBox2.Text != "")
{
MessageBox.Show("请输入管理员的账户！");
textBox1.Focus();
}
else
{
if (textBox1.Text != "" && textBox2.Text == "")
{
MessageBox.Show("请输入密码！");
textBox2.Focus();
}
else
{
SqlConnection thisConn = new SqlConnection("Server=szpt-ceacc3d660\\SQLEXPRESS;Integrated Security=true;Database=数据库"); //创建与数据库的连接
SqlDataAdapter thisAdapter = new SqlDataAdapter("select * from 管理员信息", thisConn); //创建SQL适配器
SqlCommandBuilder thisBuilder = new SqlCommandBuilder(thisAdapter); //创建SQL命令生成器
DataSet thisDataSet = new DataSet(); //创建数据集
thisAdapter.Fill(thisDataSet, "Administrator"); //将查询结果填充到数据集中
int i = 0;
foreach(DataRow row in thisDataSet.Tables["Administrator"].Rows)
{
if (textBox1.Text == row["管理员"].ToString())
{
if (textBox2.Text == row["密码"].ToString())
{
MessageBox.Show("登录成功！");
this.Close();
break;
}
else
{
MessageBox.Show("密码错误！请重新输入密码！");
textBox2.Text = "";
textBox2.Focus();
}
}
else
{
i=i+1;
if (i == thisDataSet.Tables["Administrator"].Rows.Count)
{
MessageBox.Show("无此管理员！请重新输入！");
textBox1.Text = "";
textBox2.Text = "";
textBox1.Focus();
}
}
}
}
}
}
}
}
}
二、数据库操作窗口
源代码：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient; //此处的应用是必要的
namespace 数据库
{
public partial class Form2 : Form
{
public Form2()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
SqlConnection thisConn = new SqlConnection("Server=szpt-ceacc3d660\\SQLEXPRESS;Integrated Security=true;Database=数据库"); //创建与数据库的连接
SqlDataAdapter thisAdapter = new SqlDataAdapter("select * from 学生信息", thisConn); //创建SQL适配器
SqlCommandBuilder thisBuilder = new SqlCommandBuilder(thisAdapter); //创建SQL命令生成器
DataSet thisDataSet = new DataSet(); //创建数据集
thisAdapter.Fill(thisDataSet, "Student"); //将查询结果填充到数据集中
listBox1.Items.Clear();
listBox1.Items.Add(" 学号 姓名 性别 年龄 成绩");
foreach(DataRow row in thisDataSet.Tables["Student"].Rows)
{
listBox1.Items.Add(row["学号"].ToString() + " " + row["姓名"].ToString() + " " + row["性别"].ToString() + " " + row["年龄"].ToString() + " " + row["成绩"].ToString());
}
}
private void button2_Click(object sender, EventArgs e)
{
SqlConnection thisConn = new SqlConnection("Server=szpt-ceacc3d660\\SQLEXPRESS;Integrated Security=true;Database=数据库"); //创建与数据库的连接
SqlDataAdapter thisAdapter = new SqlDataAdapter("select * from 学生信息", thisConn); //创建SQL适配器
SqlCommandBuilder thisBuilder = new SqlCommandBuilder(thisAdapter); //创建SQL命令生成器
DataSet thisDataSet = new DataSet(); //创建数据集
thisAdapter.Fill(thisDataSet, "Student"); //将查询结果填充到数据集中
DataRow newRow = thisDataSet.Tables["Student"].NewRow(); //创建新行
newRow["学号"] = textBox1.Text.ToString();
newRow["姓名"] = textBox2.Text.ToString();
newRow["性别"] = textBox3.Text.ToString();
newRow["年龄"] = textBox4.Text.ToString();
newRow["成绩"] = textBox5.Text.ToString();
thisDataSet.Tables["Student"].Rows.Add(newRow); //增加到数据集里
thisAdapter.Update(thisDataSet,"Student"); //写到数据库中
MessageBox.Show("插入数据成功！");
listBox2.Items.Clear();
listBox2.Items.Add(" 学号 姓名 性别 年龄 成绩");
foreach(DataRow row in thisDataSet.Tables["Student"].Rows)
{
listBox2.Items.Add(row["学号"].ToString() + " " + row["姓名"].ToString() + " " + row["性别"].ToString() + " " + row["年龄"].ToString() + " " + row["成绩"].ToString());
}
textBox1.Text = "";
textBox2.Text = "";
textBox3.Text = "";
textBox4.Text = "";
textBox5.Text = "";
}
private void button3_Click(object sender, EventArgs e)
{
SqlConnection thisConn = new SqlConnection("Server=szpt-ceacc3d660\\SQLEXPRESS;Integrated Security=true;Database=数据库"); //创建与数据库的连接
SqlDataAdapter thisAdapter = new SqlDataAdapter("select * from 学生信息", thisConn); //创建SQL适配器
SqlCommandBuilder thisBuilder = new SqlCommandBuilder(thisAdapter); //创建SQL命令生成器
DataSet thisDataSet = new DataSet(); //创建数据集
thisAdapter.Fill(thisDataSet, "Student"); //将查询结果填充到数据集中
thisDataSet.Tables["Student"].Rows[Convert.ToInt16(textBox6.Text)].Delete();
thisAdapter.Update(thisDataSet, "Student");
listBox3.Items.Clear();
listBox3.Items.Add(" 学号 姓名 性别 年龄 成绩");
foreach (DataRow row in thisDataSet.Tables["Student"].Rows)
{
listBox3.Items.Add(row["学号"].ToString() + " " + row["姓名"].ToString() + " " + row["性别"].ToString() + " " + row["年龄"].ToString() + " " + row["成绩"].ToString());
}
textBox6.Text = "";
}
private void button4_Click(object sender, EventArgs e)
{
SqlConnection thisConn = new SqlConnection("Server=szpt-ceacc3d660\\SQLEXPRESS;Integrated Security=true;Database=数据库"); //创建与数据库的连接
SqlDataAdapter thisAdapter = new SqlDataAdapter("select * from 学生信息", thisConn); //创建SQL适配器
SqlCommandBuilder thisBuilder = new SqlCommandBuilder(thisAdapter); //创建SQL命令生成器
DataSet thisDataSet = new DataSet(); //创建数据集
thisAdapter.Fill(thisDataSet, "Student"); //将查询结果填充到数据集中
thisDataSet.Tables["Student"].Rows[Convert.ToInt16(textBox7.Text)]["成绩"] = textBox8.Text;
thisAdapter.Update(thisDataSet, "Student");
listBox4.Items.Clear();
listBox4.Items.Add(" 学号 姓名 性别 年龄 成绩");
foreach (DataRow row in thisDataSet.Tables["Student"].Rows)
{
listBox4.Items.Add(row["学号"].ToString() + " " + row["姓名"].ToString() + " " + row["性别"].ToString() + " " + row["年龄"].ToString() + " " + row["成绩"].ToString());
}
textBox7.Text = "";
textBox8.Text = "";
}
private void button5_Click(object sender, EventArgs e)
{
string command1 ="select * from 学生信息 where 性别='男'";
SqlConnection thisConn = new SqlConnection("Server=szpt-ceacc3d660\\SQLEXPRESS;Integrated Security=true;Database=数据库"); //创建与数据库的连接
SqlDataAdapter thisAdapter = new SqlDataAdapter(command1, thisConn); //创建SQL适配器
SqlCommandBuilder thisBuilder = new SqlCommandBuilder(thisAdapter); //创建SQL命令生成器
DataSet thisDataSet = new DataSet(); //创建数据集
thisAdapter.Fill(thisDataSet, "Student"); //将查询结果填充到数据集中
listBox5.Items.Clear();
listBox5.Items.Add(" 学号 姓名 性别 年龄 成绩");
foreach (DataRow row in thisDataSet.Tables["Student"].Rows)
{
listBox5.Items.Add(row["学号"].ToString() + " " + row["姓名"].ToString() + " " + row["性别"].ToString() + " " + row["年龄"].ToString() + " " + row["成绩"].ToString());
}
}
private void button6_Click(object sender, EventArgs e)
{
int i = 60;
string command2 = "select * from 学生信息 where 成绩<"+i;
SqlConnection thisConn = new SqlConnection("Server=szpt-ceacc3d660\\SQLEXPRESS;Integrated Security=true;Database=数据库"); //创建与数据库的连接
SqlDataAdapter thisAdapter = new SqlDataAdapter(command2, thisConn); //创建SQL适配器
SqlCommandBuilder thisBuilder = new SqlCommandBuilder(thisAdapter); //创建SQL命令生成器
DataSet thisDataSet = new DataSet(); //创建数据集
thisAdapter.Fill(thisDataSet, "Student"); //将查询结果填充到数据集中
listBox5.Items.Clear();
listBox5.Items.Add(" 学号 姓名 性别 年龄 成绩");
foreach (DataRow row in thisDataSet.Tables["Student"].Rows)
{
listBox5.Items.Add(row["学号"].ToString() + " " + row["姓名"].ToString() + " " + row["性别"].ToString() + " " + row["年龄"].ToString() + " " + row["成绩"].ToString());
}
}
private void button7_Click(object sender, EventArgs e)
{
int age=17;
string command3 = "select * from 学生信息 where 年龄>"+age+"and 性别='男'";
SqlConnection thisConn = new SqlConnection("Server=szpt-ceacc3d660\\SQLEXPRESS;Integrated Security=true;Database=数据库"); //创建与数据库的连接
SqlDataAdapter thisAdapter = new SqlDataAdapter(command3, thisConn); //创建SQL适配器
SqlCommandBuilder thisBuilder = new SqlCommandBuilder(thisAdapter); //创建SQL命令生成器
DataSet thisDataSet = new DataSet(); //创建数据集
thisAdapter.Fill(thisDataSet, "Student"); //将查询结果填充到数据集中
listBox5.Items.Clear();
listBox5.Items.Add(" 学号 姓名 性别 年龄 成绩");
foreach (DataRow row in thisDataSet.Tables["Student"].Rows)
{
listBox5.Items.Add(row["学号"].ToString() + " " + row["姓名"].ToString() + " " + row["性别"].ToString() + " " + row["年龄"].ToString() + " " + row["成绩"].ToString());
}
}
private void button8_Click(object sender, EventArgs e)
{
string command4 = "select * from 学生信息 where 性别='女'";
SqlConnection thisConn = new SqlConnection("Server=szpt-ceacc3d660\\SQLEXPRESS;Integrated Security=true;Database=数据库"); //创建与数据库的连接
SqlDataAdapter thisAdapter = new SqlDataAdapter(command4, thisConn); //创建SQL适配器
SqlCommandBuilder thisBuilder = new SqlCommandBuilder(thisAdapter); //创建SQL命令生成器
DataSet thisDataSet = new DataSet(); //创建数据集
thisAdapter.Fill(thisDataSet, "Student"); //将查询结果填充到数据集中
listBox5.Items.Clear();
listBox5.Items.Add(" 学号 姓名 性别 年龄 成绩");
foreach (DataRow row in thisDataSet.Tables["Student"].Rows)
{
listBox5.Items.Add(row["学号"].ToString() + " " + row["姓名"].ToString() + " " + row["性别"].ToString() + " " + row["年龄"].ToString() + " " + row["成绩"].ToString());
}
}
}
}
