数据库操作

<1>连接数据库操作：

string s = "Data Source=服务器名称;Initial Catalog=数据库名称;Integrated Security=True"; //连接数据库所需要的字符串

SqlConnection con = new SqlConnection();

con.ConnectionString = s;

con.Open();

<2>将数据库信息显示在datagridview中

string selectCommandText = "select * from 治疗信息(表名)";

DataSet ds = new DataSet();

con.ConnectionString = s;

sda = new SqlDataAdapter(selectCommandText, con);

sda.Fill(ds);

dataGridView1.DataSource = ds.Tables[0]; //完成数据绑定，datagridview控件可以显示

<3>DataGridView动态更新数据库：

string s = "Data Source=A3135;Initial Catalog=TotalNumber;Integrated Security=True";

SqlConnection con = new SqlConnection();

SqlDataAdapter sda = new SqlDataAdapter();

BindingSource bs = new BindingSource();

DataTable dt = new DataTable();

绑定数据库按钮：

con.ConnectionString = s;

string selectCommandText = "select * from 数据源";

sda = new SqlDataAdapter(selectCommandText, con);

sda.Fill(dt);

bs.DataSource = dt; //绑定BindingSource

dataGridView1.DataSource = dt; //完成数据绑定，datagridview可以显示数据

动态更新数据库按钮：

SqlCommandBuilder cb = new SqlCommandBuilder(sda);

sda.Update((DataTable)bs.DataSource);

获取当前行的信息：

RowNumber = SearchAnswer.CurrentCell.RowIndex; //SearchAnswer为DataGridview名

SickNumber = (int)SearchAnswer.Rows[RowNumber].Cells[0].Value;

string name = (string)SearchAnswer.Rows[RowNumber].Cells[1].Value;

设置当前选中行为一整行：

dgv.SelectionMode = DataGridViewSelectionMode.FullRowSelect; //选中状态为当前行

设置当前列不可排序:

dgv.Columns[i].SortMode = DataGridViewColumnSortMode.NotSortable; //禁止对列进行排序

<4>DataGridView实现数据库的修改

删除选中行：

int RowNumber = dataGridView1.CurrentCell.RowIndex; //获取当前选中行的行号

dataGridView1.Rows.RemoveAt(RowNumber);

SqlCommandBuilder cb = new SqlCommandBuilder(sda); //更新数据库

sda.Update((DataTable)bs.DataSource);

动态添加行，显示DataTable中的内容：

private void SetupColumns(DataGridView dgv, DataTable dt)

{

dgv.AutoGenerateColumns = false; //设置datagridview不可自动创建列

//手动为datagridview添加新列

dgv.Columns.Clear();

DataGridViewTextBoxColumn nameColumn = new DataGridViewTextBoxColumn();

nameColumn.HeaderText = "病历名称"; //列名称

nameColumn.ValueType = typeof(string); //设置列属性

dgv.Columns.Add(nameColumn); //添加列

DataGridViewTextBoxColumn CreateTimeColumn = new DataGridViewTextBoxColumn();

CreateTimeColumn.HeaderText = "创建时间";

CreateTimeColumn.ValueType = typeof(string);

dgv.Columns.Add(CreateTimeColumn);

DataGridViewTextBoxColumn PathColumn = new DataGridViewTextBoxColumn();

PathColumn.HeaderText = "病历保存路径";

PathColumn.ValueType = typeof(string);

dgv.Columns.Add(PathColumn);

//循环遍¦历Datatable中内容赋值给datagridview的每一行

foreach (DataRow dr in dt.Rows)

{

int j = 0;

int dgvCount = dgv.Rows.Add(); //给datagridview动态创建一个行对象

foreach (DataColumn dc in dt.Columns)

{

string name = (string)dr[dc];

dgv.Rows[dgvCount].Cells[j].Value = name;

j++;

}

}

}

<6>将数据库信息写入byte数组：

con.ConnectionString = s;

con.Open();

SqlCommand sqlcommon = new SqlCommand("select * from 数据源", con);

SqlDataReader reader1 = sqlcommon.ExecuteReader();

int Line = reader1.FieldCount - 1;//获取当前行中的列数

int Row = 0; //记录当前数据库的行数

int num = 0; //记录receiveData数据

while (reader1.Read())

{

Row++;

}

reader1.Close();

byte[] receiveData = new byte[Row * Line];

SqlDataReader reader = sqlcommon.ExecuteReader();

while (reader.Read())

{

receiveData[num] = (byte)(int.Parse((string)reader["列名"].ToString().Trim()));

receiveData[num + 1] = (byte)(int.Parse((string)reader["列名"].ToString().Trim()));

receiveData[num + 2] = (byte)(int.Parse((string)reader["列名"].ToString().Trim()));

receiveData[num + 3] = (byte)(int.Parse((string)reader["列名"].ToString().Trim()));

receiveData[num + 4] = (byte)(int.Parse((string)reader["列名"].ToString().Trim()));

receiveData[num + 5] = (byte)(int.Parse((string)reader["列名"].ToString().Trim()));

receiveData[num + 6] = (byte)(int.Parse((string)reader["列名"].ToString().Trim()));

num += 7;

}

reader.Close();

con.Close();

<7>将byte数组写入数据库：

con.Open();

string SqlStartTime = " insert into [表名](列1,列2,列3)values(@Line,@FH1,@FH2)";

SqlCommand cmd = new SqlCommand(s, con);

cmd.Parameters.AddWithValue("@Line", MajorKey);

cmd.Parameters.AddWithValue("@FH1", buffer[i].ToString());

cmd.Parameters.AddWithValue("@FH2", buffer[i + 1].ToString());

cmd.ExecuteNonQuery();//注意此句没有就无法插入数据

con.Close(); //关闭打开连接

<8>DropDownList动态显示数据库中的表：

string s = "Data Source=A3135;Initial Catalog=TotalNumber;Integrated Security=True";

con = new SqlConnection(s);

DataSet ds = new DataSet();

string strSQL = "select name from sysobjects where type='" + 'U' + "'";

sda = new SqlDataAdapter(strSQL, con);

sda.Fill(ds);

for (int i = 0; i < ds.Tables[0].Rows.Count; i++)

{

comboBox1.Items.Add(ds.Tables[0].Rows[i][0].ToString());

}