前言：
如今同学们对“oracleblob实现地址”大概比较着重，同学们都想要知道一些“oracleblob实现地址”的相关知识。那么小编也在网摘上汇集了一些有关“oracleblob实现地址””的相关知识，希望姐妹们能喜欢，朋友们快快来学习一下吧！1、用C#实现Oracle数据库BLOB字段与本地照片文件的存取操作
1、从数据库读取BLOB数据写入本地文件
// strid 主键字段名 strzp 照片字段名 strtb 数据库表名 strpath 存放照片的本地路径
byte[] img = new byte[0];
OracleCommand cmd = new OracleCommand();
OracleDataReader rs;
cmd.Connection = conn;
cmd.CommandType = CommandType.Text;
cmd.CommandText = "select " + strid + ", " + strzp + " from " + strtb;
rs = cmd.ExecuteReader();
while (rs.Read())
{
img = (byte[])rs[1];
System.IO.File.WriteAllBytes(strpath + "\\" + rs[0].ToString() + ".jpg", img);
}
rs.Close();
2、将本地图片文件存入数据库
//参数说明：数据库表名，主键字段名，照片字段名，写入主键值，本地照片文件名，含完整路径
private Boolean insertpic(string d_tb, string d_id, string d_zp, string id, string filename)
{
int result = 0;
string strsql = "insert into " + d_tb + "(" + d_id + "," + d_zp + ") values('" + id + "', :pic)";
OracleCommand cmd = new OracleCommand();
cmd.Connection = conn;
cmd.CommandText = strsql;
FileStream fs = System.IO.File.OpenRead(filename);
byte[] imagebyte = new byte[fs.Length];
fs.Read(imagebyte, 0, (int)fs.Length);
cmd.Parameters.Add(new OracleParameter(":pic", imagebyte));
try
{
result = cmd.ExecuteNonQuery();
}
catch
{result = 0; }
if (result == 1)
return true;
else
return false;
}
原文链接：
2、用C#实现MySql数据库BLOB字段的读取
读数据：
public List<AuthorizationInfo> GetList(string typeAuthorization)
{
string selectAll = “需要执行的SQl语句”
List<AuthorizationInfo> authorizationInfoList = null;
using (MySqlDataReader reader = DAL.MySqlHelper.ExecuteReader(CommandType.Text, selectAll))
{
if (reader != null)
{
authorizationInfoList = new List<AuthorizationInfo>();
while (reader.Read())
{
AuthorizationInfo info = new AuthorizationInfo();
info.ID = reader.GetInt32(0);
info.InstrumentID = reader.IsDBNull(1) ? 0 : reader.GetInt32(1);
//此处省略其他字段……..
info.MachineID_crypt = reader.IsDBNull(17) ? null : (byte[])reader.GetValue(17);
authorizationInfoList.Add(info);
}
}
}
return authorizationInfoList;
}
写数据：
public int Add(AuthorizationInfo authorizationInfo, string Type)
{
string sqlStr = “执行的sql语句”;
MySqlParameter[] mySqlParameters =
{
new MySqlParameter("@MachineID_crypt",MySqlDbType.Blob),
};
mySqlParameters[10].Value = authorizationInfo.MachineID_crypt;
object obj = DAL.MySqlHelper.ExecuteScalar(DAL.MySqlHelper.Conn, CommandType.Text, sqlStr, mySqlParameters);
if (obj == null)
{
return 0;
}
else
{
return Convert.ToInt32(obj);
}
}
标签： #oracleblob实现地址
