Oracle 写入和读取blob类型的数据（C#）

oracle建表语句

Create table blogtest(id number primary key,name varchar2(20),picture blob);

C#写入数据库中

/// <summary>

 /// 增加一条数据

 /// </summary>

 public int Add(BlogTestInfo model)

 {

 StringBuilder strSql = new StringBuilder();

 strSql.Append("insert into BlogTest(");

 strSql.Append("ID,Name,Picture)");

 strSql.Append(" values (");

 strSql.Append("SEQ_BlogTestID.Nextval,:Name,:Picture)");//SEQ_BlogTestID 是数据库中的序列

 Database db = DatabaseFactory.CreateDatabase();

 DbCommand dbCommand = db.GetSqlStringCommand(strSql.ToString());

//db.AddInParameter(dbCommand, ":ID", DbType.String, model.ID);

 db.AddInParameter(dbCommand, ":Name", DbType.String, model.Name);

//字符窜转成byte[] 加入数据库中

byte[] bytes = System.Text.Encoding.UTF8.GetBytes(model.Picture.ToString());

 db.AddInParameter(dbCommand, ":Picture", DbType.Binary, bytes); 

 int rows= db.ExecuteNonQuery(dbCommand);

 return rows;

 #region OraAcess

 //StringBuilder strSql = new StringB:REMARK2", Oracluilder();

 //strSql.Append("insert into MONRE:REMARK3", OraclPORTCOMMENTS(");

 //strSql.Append("ID,CLIENTID,PRODUCTTYPEID,COMPANYID,SALESDATE,REMARK1,REMARK2,REMARK3)");

 //strSql.Append(" values (");

 //strSql.Append(":ID,:CLIENTID,:PRODUCTTYPEID,:COMPANYID,:SALESDATE,:REMARK1,:REMARK2,:REMARK3)");

 //Oracle.DataAccess.Client.OracleParameter[] parameters = {

 // new Oracle.DataAccess.Client.OracleParameter(":ID", Oracle.DataAccess.Client.OracleDbType.NVarchar2),

 // new Oracle.DataAccess.Client.OracleParameter(":CLIENTID", Oracle.DataAccess.Client.OracleDbType.Int32,4),

 // new Oracle.DataAccess.Client.OracleParameter(":PRODUCTTYPEID", Oracle.DataAccess.Client.OracleDbType.Int32,4),

 // new Oracle.DataAccess.Client.OracleParameter(":COMPANYID", Oracle.DataAccess.Client.OracleDbType.Int32,4),

 // new Oracle.DataAccess.Client.OracleParameter(":SALESDATE", Oracle.DataAccess.Client.OracleDbType.Date),

 // new Oracle.DataAccess.Client.OracleParameter(":REMARK1", Oracle.DataAccess.Client.OracleDbType.NVarchar2),

 // new Oracle.DataAccess.Client.OracleParameter(":REMARK2", Oracle.DataAccess.Client.OracleDbType.NVarchar2),

 // new Oracle.DataAccess.Client.OracleParameter(":REMARK3", Oracle.DataAccess.Client.OracleDbType.NVarchar2)};

 //parameters[0].Value = model.ID;

 //parameters[1].Value = model.ClientID;

 //parameters[2].Value = model.ProductTypeID;

 //parameters[3].Value = model.CompanyID;

 //parameters[4].Value = model.SalesDate;

 //parameters[5].Value = model.Remark1;

 //parameters[6].Value = model.Remark2;

 //parameters[7].Value = model.Remark3;

 //OracleDataAccessHelper helper = new OracleDataAccessHelper();

 //int rows = helper.ExecuteNonQuery(strSql.ToString(), parameters);

 //return rows;

 #endregion OraAcess

 }

读取方法

protected DataTable GetDataTable()

 {

 DataTable dt = new DataTable();

//获取数据

 //BLL.SalesBLL bll = new SalesBLL();

 string saleDate = this.txtDate.Text.Trim().Replace("-", "");

dt = bll.GetDataTable();

 if (dt.Rows.Count > 0)

 {

 DataRow dr = dt.Rows[0];

BlogTestInfo model=new BlogTestInfo();

 model.id=int.Parse(dr["ID"].ToString());

 //this.tbRemark1.Text = dr["Remark1"].ToString();

 if (dr["Picture"] != null && dr["Picture"] != DBNull.Value)

 {

 //byte[] b = System.Text.Encoding.ASCII.GetBytes(dr["Remark1"]);

 byte[] b = (byte[])dr["Picture"];

//byte[]  转成 字符窜

model.Text = System.Text.Encoding.UTF8.GetString(b);//dr["Remark1"].ToString();

 }

 }

 }

return dt;

 }