一:数据库连接代码:
SqlConnection objSqlConnection = new SqlConnection ("server = 127.0.0.1;uid = sa; pwd =;database =test");
objSqlConnection.Open();
二:数据库的添加记录代码:
int i = 0;
string s1 = "", s2 = "";
i = Convert.ToInt16(textBox1.Text);
s1 = textBox2.Text;
s2 = textBox3.Text;
SqlConnection objSqlConnection = new SqlConnection("server = 127.0.0.1;uid = sa; pwd =;database =test");
objSqlConnection.Open();
MessageBox.Show("数据库连接成功", "好");
try
{
SqlCommand sqlcom = new SqlCommand("insert into info(id,name,sex) values( " + i + ",'" + s1 + "','" + s2 + "')", objSqlConnection);
sqlcom.ExecuteNonQuery();
MessageBox.Show("添加成功!", "啊");
}
catch (Exception a)
{
MessageBox.Show(a.ToString());
}
MessageBox.Show("添加成功!", "啊");
}
三:数据库的修改代码:
int i = 0;
string s1 = "", s2 = "";
s1 = textBox2.Text;
s2 = textBox3.Text;
if (textBox1.Text.Length == 0)
i = 0;
else
i = Convert.ToInt32(textBox1.Text);
SqlConnection objSqlConnection = new SqlConnection("server = 127.0.0.1;uid = sa; pwd =;database =test");
objSqlConnection.Open();
MessageBox.Show("数据库连接成功", "好");
try
{
SqlCommand sqlcom = new SqlCommand("update info set name='"+s1+"',sex='"+s2+"'"+"where id=" + i, objSqlConnection);
sqlcom.ExecuteNonQuery();
MessageBox.Show("修改成功!", "啊");
objSqlConnection.Close();
}
catch (Exception a)
{
MessageBox.Show(a.ToString());
}
四:数据库的删除代码:
int i = 0;
string s1 = "", s2 = "";
s1 = textBox2.Text;
s2 = textBox3.Text;
if(textBox1.Text.Length==0)
i=0;
else
i = Convert.ToInt16(textBox1.Text);
SqlConnection objSqlConnection = new SqlConnection("server = 127.0.0.1;uid = sa; pwd =;database =test");
objSqlConnection.Open();
MessageBox.Show("数据库连接成功", "好");
try
{
SqlCommand sqlcom = new SqlCommand("delete from info where id="+i, objSqlConnection);
sqlcom.ExecuteNonQuery();
MessageBox.Show("删除成功!", "啊");
objSqlConnection.Close();
}
catch (Exception a)
{
MessageBox.Show(a.ToString());
}
五:数据库的查询代码:
1.类开始:
DataTable dt1 = new DataTable();
SqlDataAdapter da1 = new SqlDataAdapter();
2.按钮代码:
int i = 0,n=0;
string s1 = "", s2 = "";
s1 = textBox2.Text;
s2 = textBox3.Text;
if (textBox1.Text.Length == 0)
i = 0;
else
i = Convert.ToInt32(textBox1.Text);
SqlConnection objSqlConnection = new SqlConnection("server = 127.0.0.1;uid = sa; pwd =;database =test");
objSqlConnection.Open();
MessageBox.Show("数据库连接成功", "好");
string query = "SELECT * from info where id="+i;
DataSet objDataSet = new DataSet();
SqlDataAdapter obj = new SqlDataAdapter();
obj.SelectCommand = new SqlCommand(query, objSqlConnection);
obj.Fill(objDataSet, "info");
SqlCommand objSqlCommand = new SqlCommand(query, objSqlConnection);
SqlDataReader objSqlReader = objSqlCommand.ExecuteReader();
while (objSqlReader.Read())
{
n += 1;
MessageBox.Show("编号: " + objSqlReader.Getvalue(0) + " 姓名:" + objSqlReader.Getvalue(1) + " 性别" + objSqlReader.Getvalue(2));
}
if (n == 0)
MessageBox.Show("数据库中没有这样的记录!");
六:数据库的查询代码:
int i = 0;
// int n = 0;
string s1 = "", s2 = "";
string sql;
s1 = textBox2.Text;
s2 = textBox3.Text;
if (textBox1.Text.Length == 0)
{
i = 0;
}
else
i = Convert.ToInt32(textBox1.Text);
SqlConnection objSqlConnection = new SqlConnection("server = 127.0.0.1;uid = sa; pwd =;database =test");
objSqlConnection.Open();
MessageBox.Show("数据库连接成功", "好");
string query = "SELECT * from info where id="+i;
if(i==0)
sql = "select * from info ";
else
sql = "select * from info where id=" + i;
da1 = new SqlDataAdapter(sql, objSqlConnection);
dt1.Clear();
da1.Fill(dt1);
dataGridView1.DataSource = dt1;
数据库的封装类代码:
class DBClass
{
public void dbclass(string sql)
{
try
{
SqlConnection sqlcon = new SqlConnection("server = 127.0.0.1;uid = sa; pwd =;database =test");
sqlcon.Open();
SqlTransaction objt = sqlcon.BeginTransaction(); //事物开始
SqlCommand sqlcom = new SqlCommand(sql, sqlcon);
sqlcom.Transaction = objt; //将Command 对象设置为事物处理的对象
sqlcom.ExecuteNonQuery();
objt.Commit(); //提交事物
sqlcon.Close();
}
catch (Exception a)
{
MessageBox.Show(a.ToString());
}
}
}
--db2 数据库连接代码:
string strcon = "Provider = IBMDADB2; Data Source=hfzd;User Id=db2admin;Password=db2admin";
//string sql = "select * from ADMINISTRATOR.HFZD";
string sql = "delete from ADMINISTRATOR.HFZD where ID=1";
OleDbConnection olecon = new OleDbConnection(strcon);
olecon.Open();
MessageBox.Show("数据库已连接上");
dt.Clear();
da = new OleDbDataAdapter(sql, olecon);
da.Fill(dt);
dataGridView1.DataSource = dt;
olecon.Close();
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