通过DataSet更新、插入数据库

方法一:

 //与SQL Server的连接字符串设置

 private string _connString;

 private string _strSql;

 private SqlCommandBuilder sqlCmdBuilder;

 private DataSet ds = new DataSet();

 private SqlDataAdapter da;

 public sqlAccess(string connString,string strSql)

 {

      this._connString=connString;

 }

 private SqlConnection GetConn() 

 { 

      try 

      { 

           SqlConnection Connection = new SqlConnection(this._connString); 

           Connection.Open(); 

           return Connection; 

      } 

      catch (Exception ex) 

      { 

           MessageBox.Show(ex.Message,"数据库连接失败");

           throw;

      } 

 }

 //根据输入的SQL语句检索数据库数据

 public DataSet SelectDb(string strSql,string strTableName)

 { 

      try

      {

          this._strSql = strSql;

          this.da = new SqlDataAdapter(this._strSql,this.GetConn());

          this.ds.Clear();

          this.da.Fill(ds,strTableName);

          return ds;//返回填充了数据的DataSet,其中数据表以strTableName给出的字符串命名

      }

      catch (Exception ex) 

      { 

           MessageBox.Show(ex.Message,"数据库操作失败");

           throw;

      } 

 }

 //数据库数据更新(传DataSet和DataTable的对象)

 public DataSet UpdateDs(DataSet changedDs,string tableName)

 {

      try

      {

          this.da = new SqlDataAdapter(this._strSql,this.GetConn());

          this.sqlCmdBuilder = new SqlCommandBuilder(da);

          this.da.Update(changedDs,tableName);

          changedDs.AcceptChanges();

          return changedDs;//返回更新了的数据库表

      }

      catch (Exception ex) 

      { 

           MessageBox.Show(ex.Message,"数据库更新失败");

           throw;

      } 

}

 

 

1. GetConn方法创建一个数据库连接,返回SqlConnection。 

2.使用的select命令中必须包含主键,这点大家都知道的! 

3. this.da.Fill(ds,strTableName) 填充数据集 

4.构造CommandBuilder对象时,将DataAdapter对象作为构造函数参数传入: 

  this.sqlCmdBuilder = new SqlCommandBuilder(da); 

5. 在调用UpdateDs()更新数据库前,请检查changedDs是否已经被更新过,用changedDs.[tableName] GetChanges() != null; 

6.用this.da.Update(changedDs,tableName)方法更新数据,然后调用changedDs.AcceptChanges()才能真正的更新数据库,调用 changedDs.RejectChanges() 取消更新。 



方法二:

该方法可能存在性能问题

            int tab1Count = ds.Tables["ruledetail_setup"].Rows.Count;

            for (int i = 0; i < tab1Count; i++)

            {

                string sql = "select count(*) from ruledetail_setup where type = " + type + " and ID = ";

                    sql += ds.Tables["ruledetail_setup"].Rows[i]["ID"];

                if (Convert.ToInt32(SqlHelper.ExecuteScalar(CommandType.Text, sql, null)) != 0)

                {

                    string sqlUpdata = "updata ruledetail_setup set errorLimit={0},scoreInterval={1},detailRule={2},gradeTime={3} ";

                    sqlUpdata += "where type = " + type + " and ID = " + ds.Tables["ruledetail_setup"].Rows[i]["ID"];

                    String.Format(sqlUpdata,

                        ds.Tables["ruledetail_setup"].Rows[i]["errorLimit"],

                        ds.Tables["ruledetail_setup"].Rows[i]["scoreInterval"],

                        ds.Tables["ruledetail_setup"].Rows[i]["detailRule"],

                        ds.Tables["ruledetail_setup"].Rows[i]["gradeTime"]);

                    SqlHelper.ExecuteNonQuery(CommandType.Text, sqlUpdata, null);

                }

                else

                {

                    string sqlIns = "insert into ruledetail_setup (Type,ID,errorLimit,scoreInterval,detailRule,gradeTime) ";

                        sqlIns += "values ("+type+",{0},{1},{2},{3},{4})";

                    String.Format(sqlIns,

                        ds.Tables["ruledetail_setup"].Rows[i]["ID"],

                        ds.Tables["ruledetail_setup"].Rows[i]["errorLimit"],

                        ds.Tables["ruledetail_setup"].Rows[i]["scoreInterval"],

                        ds.Tables["ruledetail_setup"].Rows[i]["detailRule"],

                        ds.Tables["ruledetail_setup"].Rows[i]["gradeTime"]);

                    SqlHelper.ExecuteNonQuery(CommandType.Text, sqlIns, null);

                }

            }

 

 

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