public int AddVeinMessage(byte[] data)//插入数据库

{

using (BCSSqlConnection = new MySqlConnection(strConn))

{

try

{

dbHelper = new DBHelper(BCSSqlConnection);

StringBuilder sbSql = new StringBuilder();

sbSql.Append("insert into table1(");

sbSql.Append("data)");

sbSql.Append(" values (");

sbSql.Append(" ?data)");

string strInsertSql = sbSql.ToString();

MySqlCommand cmd = dbHelper.GetSqlStringCommond(strInsertSql);

dbHelper.AddInParameter(cmd, "?data", MySqlDbType.VarBinary, FINGERDATA);

return dbHelper.ExecuteNonQuery(cmd);

}

catch (Exception ex)

{

System.Windows.Forms.MessageBox.Show("添加失败了" + ex.Message);

return 0; //表示数据库异常

}

finally

{

dbHelper.CloseSqlConnection(); //关闭数据库

}

}

}

从数据库中取出

public DataTable SelectVeinMessage()

{

using (BCSSqlConnection = new MySqlConnection(strConn))

{

try

{

StringBuilder sbSql = new StringBuilder();

sbSql.Append("select data from table");

//设置MYSQL查询语句用于查询符合查询条件的记录

string strSql = sbSql.ToString();

dbHelper = new DBHelper(BCSSqlConnection);

//调用DBHelper类中的GetSqlStringCommond()方法将返回的MySqlCommand对象赋给cmd

MySqlCommand cmd = dbHelper.GetSqlStringCommond(strSql);

// dbHelper.AddInParameter(cmd, "?FINGERDATA", MySqlDbType.VarChar, FINGERDATA);

//调用DBHelper类的ExecuteDataSet()方法

DataTable dt = dbHelper.ExecuteDataTable(cmd);

//返回DataTable对象dt

return dt;

}

catch (Exception e)

{

throw new Exception(e.Message);

}

finally

{

dbHelper.CloseSqlConnection();

}

}

}

DataTable dt = mm.SelectVeinMessage1();

byte[] TemplateBuff = new byte[512];

for (int i = 0; i < dt.Rows.Count; i++)

{

TemplateBuff = (byte[])dt.Rows[i]["data"];

}