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dotnet代码自动生成机的实现(2)

    博客分类:
  • .NET
 
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在syscolumns 里有一个字段xtype,该字段表示列的数据类型,俺定义了两个函数,能根据xtype的值得到对应的dotnet中的数据类型和sqldb数据类型:
private string getType(int iType)
        {
            string strResult = "";
            switch (iType)
            {
                case 34:
                    strResult = "Byte[]";
                    break;
                case 35:
                case 99:
                case 167:
                case 175:
                case 231:
                case 239:
                    strResult = "string";
                    break;
                case 48:
                case 52:
                case 56:
                case 127:
                    strResult = "int";
                    break;
                case 58:
                case 61:
                    strResult = "DateTime";
                    break;
                case 59:
                    strResult = "Single";
                    break;
                case 60:
                case 106:
                case 108:
                case 122:
                    strResult = "Decimal";
                    break;
                case 62:
                    strResult = "Double";
                    break;
                case 104:
                    strResult = "bool";
                    break;
                default:
                    strResult = "None";//"unknow" ; 
                    break;
            }
            return strResult + " ";
        }

        private string getSqlDBType(int iType)
        {
            string strResult = "";
            switch (iType)
            {
                case 34:
                    strResult = "SqlDbType.Image";
                    break;
                case 35:
                    strResult = "SqlDbType.Text";
                    break;
                case 48:
                    strResult = "SqlDbType.TinyInt";
                    break;
                case 52:
                    strResult = "SqlDbType.SmallInt";
                    break;
                case 56:
                    strResult = "SqlDbType.Int";
                    break;
                case 58:
                    strResult = "SqlDbType.SmallDateTime";
                    break;
                case 59:
                    strResult = "SqlDbType.Real";
                    break;
                case 60:
                    strResult = "SqlDbType.Money";
                    break;
                case 61:
                    strResult = "SqlDbType.DateTime";
                    break;
                case 62:
                    strResult = "SqlDbType.Float";
                    break;
                case 99:
                    strResult = "SqlDbType.NText";
                    break;
                case 104:
                    strResult = "SqlDbType.Bit";
                    break;
                case 106:
                    strResult = "SqlDbType.Decimal";
                    break;
                case 108:
                    strResult = "SqlDbType.Decimal";
                    break;
                case 122:
                    strResult = "SqlDbType.SmallMoney";
                    break;
                case 127:
                    strResult = "SqlDbType.BigInt";
                    break;
                case 165:
                    strResult = "SqlDbType.VarBinary";
                    break;
                case 167:
                    strResult = "SqlDbType.VarChar";
                    break;
                case 173:
                    strResult = "SqlDbType.Binary";
                    break;
                case 175:
                    strResult = "SqlDbType.Char";
                    break;
                case 189:
                    strResult = "SqlDbType.Timestamp";
                    break;
                case 231:
                    strResult = "SqlDbType.NVarChar";
                    break;
                case 239:
                    strResult = "SqlDbType.NChar";
                    break;
                default:
                    strResult = "None";//"unknow" ; 
                    break;
            }
            return strResult + " ";
        } 

当然,还有一个函数先介绍一下,后面有它的具体用法:
private string getTypeShort(int iType)
        {
            string strResult = "";
            switch (getType(iType).Trim())
            {
                case "Byte[]":
                    strResult = "img";
                    break;
                case "string":
                    strResult = "str";
                    break;
                case "int":
                    strResult = "i";
                    break;
                case "DateTime":
                    strResult = "dt";
                    break;
                case "Single":
                    strResult = "sig";
                    break;
                case "Decimal":
                    strResult = "dec";
                    break;
                case "Double":
                    strResult = "db";
                    break;
                case "bool":
                    strResult = "bl";
                    break;
                default:
                    strResult = "unknow";
                    break;
            }
            return strResult;
        }

现在有了上面的介绍和函数基础,我们可以逐步实现我们的目标了:
1.生成数据实体类的数据成员
大家看一下,对于一个字段id,整形,我们这样定义:
private int iId;
        public int Id
        {
            get
            {
                return iId;
            }
            set
            {
                iId = value;
            }
        } 

其中iId表示数据类型+字段名称,其中字段名称的第一个字母大写,代码实现如下:
private string BuildMember(DataSet ds)
        {
            StringBuilder sb = new StringBuilder();
            foreach (DataRow dr in ds.Tables[0].Rows)
            {
                int iType = (byte)dr["xtype"];
                string strType = getType(iType);
                string strName = dr["name"].ToString();
                strName = UpFirstChar(strName);
                string strShortType = getTypeShort(iType);
                string strPrivateline = "private " + strType + strShortType + strName + " ;\r\n";
                sb.Append(strPrivateline);
                string strPublicline = "public " + strType + strName + " \r\n";
                sb.Append(strPublicline);
                sb.Append("{\r\n");
                sb.Append("\tget\r\n");
                sb.Append("\t{\r\n");
                sb.Append("\t\treturn " + strShortType + strName + " ;\r\n");
                sb.Append("\t}\r\n");
                sb.Append("\tset\r\n");
                sb.Append("\t{\r\n");
                sb.Append("\t\t" + strShortType + strName + " = value ;\r\n");
                sb.Append("\t}\r\n");
                sb.Append("}\r\n");
                sb.Append("\r\n");
                sb.Append("\r\n");
            }
            return sb.ToString();
        } 

参数DataSet ds中的ds是通过上一页的sa.Fill(ds)得到的,dr["name"]表示字段名称,dr["xtype"] 是字段类型。
UpFirstChar函数负责把字符串的第一个字母大写:
private string UpFirstChar(string strvalue)
        {
            return strvalue.Substring(0, 1).ToUpper() + strvalue.Substring(1, strvalue.Length - 1);
        }


这样就生成了数据实体的数据成员。
2。生成Add方法
Add方法生成起来有点难度,可以参考第一页的程序,我们这里是通过参数的方法来实现add的。有一点要注意,就是在对参数赋值时要考虑参数值为空的情况。代码实现如下:
private string BuildAddFunction(DataSet ds)
        {
            StringBuilder sb = new StringBuilder();

            sb.Append("public bool Add()\r\n");
            sb.Append("{\r\n");
            sb.Append("\tSqlConnection conn = SqlConn.Instance().Connection ;\r\n");
            sb.Append("\r\n");
            string strInsert = "\"insert into " + strTableName + "(";
            string strFiledList = "";
            string strParamList = "";
            foreach (DataRow dr in ds.Tables[0].Rows)
            {
                string strName = dr["name"].ToString();
                strFiledList = strFiledList + strName + ", ";
                strParamList = strParamList + "@" + strName + ", ";
            }
            strFiledList = strFiledList.Trim().TrimEnd(',');
            strParamList = strParamList.Trim().TrimEnd(',');
            sb.Append("\tstring strSql = " + strInsert + strFiledList + ")\"\r\n");
            sb.Append("\t+\"values(" + strParamList + ")\" ;\r\n");
            sb.Append("\r\n");
            sb.Append("\tSqlCommand command = new SqlCommand(strSql,conn) ;\r\n");
            sb.Append("\r\n");
            foreach (DataRow dr in ds.Tables[0].Rows)
            {
                string strName = dr["name"].ToString();
                string strSqlType = getSqlDBType((byte)dr["xtype"]);
                string strShortType = getTypeShort((byte)dr["xtype"]);
                string strvalueName = strShortType + UpFirstChar(strName);
                int iLen = (Int16)dr["prec"];

                string strLen = "";
                if (strShortType == "str")
                    strLen = strLen + "," + iLen;
                string strCommandName = "\tcommand.Parameters.Add(\"@" + strName + "\"," + strSqlType + strLen + ") ;\r\n";

                string strCommandvalue = "\tcommand.Parameters[\"@" + strName + "\"].value = " + strvalueName + " ;\r\n";
                string strCommandNullvalue = "\tcommand.Parameters[\"@" + strName + "\"].value = DBNull.value ;\r\n";

                sb.Append(strCommandName);
                if (strShortType == "dt")
                    sb.Append("\tif (" + strvalueName + "!= DateTime.Minvalue )\r\n");
                else if (strShortType == "str")
                    sb.Append("\tif (" + strvalueName + "!= null )\r\n");
                else if (strShortType == "img")
                    sb.Append("\tif (" + strvalueName + "!= null )\r\n");
                else
                    sb.Append("");
                sb.Append(strCommandvalue);
                if (strShortType == "dt" || strShortType == "str" || strShortType == "img")
                {
                    sb.Append("\telse\r\n");
                    sb.Append(strCommandNullvalue);
                }
                sb.Append("\r\n");
            }

            sb.Append(AddCatchString());

            sb.Append("}\r\n");
            return sb.ToString();
        }

3。edit,delete的实现方法类似与add,就不详细说了,edit方法代码如下:
private string BuildModifyFunction(DataSet ds)
        {
            StringBuilder sb = new StringBuilder();

            sb.Append("public bool Modify()\r\n");
            sb.Append("{\r\n");
            sb.Append("\tSqlConnection conn = SqlConn.Instance().Connection ;\r\n");
            string strModify = "string strSql =\"update " + strTableName + " set ";

            string strParamList = "";
            foreach (DataRow dr in ds.Tables[0].Rows)
            {
                string strName = dr["name"].ToString();
                strParamList = strParamList + strName + " = @" + strName + ", ";
            }
            strParamList = strParamList.Trim().TrimEnd(',');
            sb.Append("\t" + strModify + strParamList + " \"\r\n");
            sb.Append("\t+ \" where id =@id \" ;\r\n");
            sb.Append("\tSqlCommand command = new SqlCommand(strSql,conn) ;\r\n");

            foreach (DataRow dr in ds.Tables[0].Rows)
            {
                string strName = dr["name"].ToString();
                string strSqlType = getSqlDBType((byte)dr["xtype"]);
                string strShortType = getTypeShort((byte)dr["xtype"]);
                string strvalueName = strShortType + UpFirstChar(strName);
                int iLen = (Int16)dr["prec"];

                string strLen = "";
                if (strShortType == "str")
                    strLen = strLen + "," + iLen;

                string strCommandName = "\tcommand.Parameters.Add(\"@" + strName + "\"," + strSqlType + strLen + ") ;\r\n";
                string strCommandvalue = "\tcommand.Parameters[\"@" + strName + "\"].value = " + strvalueName + " ;\r\n";
                sb.Append(strCommandName);
                sb.Append(strCommandvalue);
                sb.Append("\r\n");
            }

            sb.Append(AddCatchString());

            sb.Append("}\r\n");
            return sb.ToString();
        }

4。生成存储过程的执行方法和返回结果方法。存储过程的参数也在syscolumns表里有详细的说明,里面还记录了每个参数是不是传出参数,不过在这个函数里我没有考虑参数的方向,当然,要考虑进去也不是很麻烦。
private string BuildSPExec(DataSet ds)
        {
            StringBuilder sb = new StringBuilder();
            string strFuncParam = "";

            foreach (DataRow dr in ds.Tables[0].Rows)
            {
                int iType = (byte)dr["xtype"];
                string strName = UpFirstChar(dr["name"].ToString().TrimStart('@'));
                string strType = getType(iType);
                string strSqlType = getSqlDBType(iType);
                string strShortType = getTypeShort(iType);
                strFuncParam = strFuncParam + "\r\n\t\t" + strType + " a" + strShortType + strName + ",";
            }
            strFuncParam = strFuncParam.TrimEnd(',');
            string strDef = "public bool ExeSP_" + strTableName + "(" + strFuncParam + ")\r\n";
            sb.Append(strDef);
            sb.Append("{\r\n");
            sb.Append("\tSqlConnection conn = SqlConn.Instance().Connection ;\r\n");
            sb.Append("\r\n");
            sb.Append("\tstring strSPName = \"" + strTableName + "\" ;\r\n");
            sb.Append("\tSqlCommand command = new SqlCommand(strSPName,conn) ;\r\n");
            sb.Append("\tcommand.CommandType = CommandType.StoredProcedure ;\r\n");
            sb.Append("\r\n");

            foreach (DataRow dr in ds.Tables[0].Rows)
            {
                int iType = (byte)dr["xtype"];
                string strParaName = dr["name"].ToString();
                string strName = UpFirstChar(strParaName.TrimStart('@'));
                string strSqlType = getSqlDBType(iType);
                string strShortType = getTypeShort(iType);
                string strvalue = " a" + strShortType + strName;
                int iLen = (Int16)dr["prec"];

                string strLen = "";
                if (strShortType == "str")
                    strLen = strLen + "," + iLen;

                string strCommandAdd = "\tcommand.Parameters.Add(\"" + strParaName + "\"," + strSqlType + strLen + ") ;\r\n";
                string strCommandvalue = "\tcommand.Parameters[\"" + strParaName + "\"].value=" + strvalue + " ;\r\n";
                string strCommandNull = "\tcommand.Parameters[\"" + strParaName + "\"].value= DBNull.value ;\r\n";
                sb.Append(strCommandAdd);
                if (strShortType == "dt")
                    sb.Append("\tif (" + strvalue + "!= DateTime.Minvalue )\r\n\t");
                else if (strShortType == "str")
                    sb.Append("\tif (" + strvalue + "!= null )\r\n\t");
                else if (strShortType == "img")
                    sb.Append("\tif (" + strvalue + "!= null )\r\n\t");
                else
                    sb.Append("");
                sb.Append(strCommandvalue);
                if (strShortType == "dt" || strShortType == "str" || strShortType == "img")
                {
                    sb.Append("\telse\r\n\t");
                    sb.Append(strCommandNull);
                }
                sb.Append("\r\n");
            }
            sb.Append(AddCatchString());

            sb.Append("}\r\n");
            return sb.ToString();
        }

对于存储过程生成结果集的函数如下:
private string BuildSPGetData(DataSet ds)
        {
            StringBuilder sb = new StringBuilder();
            string strFuncParam = "";

            foreach (DataRow dr in ds.Tables[0].Rows)
            {
                int iType = (byte)dr["xtype"];
                string strName = UpFirstChar(dr["name"].ToString().TrimStart('@'));
                string strType = getType(iType);
                string strSqlType = getSqlDBType(iType);
                string strShortType = getTypeShort(iType);
                strFuncParam = strFuncParam + "\r\n\t\t" + strType + " a" + strShortType + strName + ",";
            }
            strFuncParam = strFuncParam.TrimEnd(',');
            string strDef = "public DataSet QuerySP_" + strTableName + "(" + strFuncParam + ")\r\n";
            sb.Append(strDef);
            sb.Append("{\r\n");
            sb.Append("\tSqlConnection conn = SqlConn.Instance().Connection ;\r\n");
            sb.Append("\r\n");
            sb.Append("\tstring strSPName = \"" + strTableName + "\" ;\r\n");
            sb.Append("\tSqlCommand command = new SqlCommand(strSPName,conn) ;\r\n");
            sb.Append("\tcommand.CommandType = CommandType.StoredProcedure ;\r\n");
            sb.Append("\r\n");

            foreach (DataRow dr in ds.Tables[0].Rows)
            {
                int iType = (byte)dr["xtype"];
                string strParaName = dr["name"].ToString();
                string strName = UpFirstChar(strParaName.TrimStart('@'));
                string strSqlType = getSqlDBType(iType);
                string strShortType = getTypeShort(iType);
                string strvalue = " a" + strShortType + strName;
                int iLen = (Int16)dr["prec"];

                string strLen = "";
                if (strShortType == "str")
                    strLen = strLen + "," + iLen;

                string strCommandAdd = "\tcommand.Parameters.Add(\"" + strParaName + "\"," + strSqlType + strLen + ") ;\r\n";
                string strCommandvalue = "\tcommand.Parameters[\"" + strParaName + "\"].value=" + strvalue + " ;\r\n";
                string strCommandNull = "\tcommand.Parameters[\"" + strParaName + "\"].value= DBNull.value ;\r\n";
                sb.Append(strCommandAdd);
                if (strShortType == "dt")
                    sb.Append("\tif (" + strvalue + "!= DateTime.Minvalue )\r\n\t");
                else if (strShortType == "str")
                    sb.Append("\tif (" + strvalue + "!= null )\r\n\t");
                else if (strShortType == "img")
                    sb.Append("\tif (" + strvalue + "!= null )\r\n\t");
                else
                    sb.Append("");
                sb.Append(strCommandvalue);
                if (strShortType == "dt" || strShortType == "str" || strShortType == "img")
                {
                    sb.Append("\telse\r\n\t");
                    sb.Append(strCommandNull);
                }
                sb.Append("\r\n");
            }

            sb.Append("\tSqlDataAdapter sdaResult = new SqlDataAdapter(command) ;\r\n");
            sb.Append("\tDataSet ds = new DataSet() ;\r\n");


            sb.Append(AddCatchQueryString());

            sb.Append("}\r\n");
            return sb.ToString();

        }

下面是生成结果集的执行结果:
public DataSet QuerySP_ddms_GetBank(
int aiPrsn_id)
        {
            SqlConnection conn = SqlConn.Instance().Connection;

            string strSPName = "ddms_GetBank";
            SqlCommand command = new SqlCommand(strSPName, conn);
            command.CommandType = CommandType.StoredProcedure;

            command.Parameters.Add("@prsn_id", SqlDbType.Int);
            command.Parameters["@prsn_id"].value = aiPrsn_id;

            SqlDataAdapter sdaResult = new SqlDataAdapter(command);
            DataSet ds = new DataSet();
            try
            {
                sdaResult.Fill(ds);
            }
            catch (Exception e)
            {
                throw (new Exception("Error in the Database" + e.Message));
            }
            finally
            {
                sdaResult.Dispose();
            }
            return ds;
        }

还有两个函数在程序中用到了,如下所示:
private string AddCatchString()
        {
            StringBuilder sb = new StringBuilder();
            sb.Append("\ttry\r\n");
            sb.Append("\t{\r\n");
            sb.Append("\t\tconn.Open() ;\r\n");
            sb.Append("\t\tcommand.ExecuteNonQuery() ;\r\n");
            sb.Append("\t\treturn true ;\r\n");
            sb.Append("\t}\r\n");
            sb.Append("\tcatch(Exception e)\r\n");
            sb.Append("\t{\r\n");
            sb.Append("\t\tthrow(new Exception(\"Error in the Database\"+e.Message)) ;\r\n");
            sb.Append("\t}\r\n");
            sb.Append("\tfinally\r\n");
            sb.Append("\t{\r\n");
            sb.Append("\t\tconn.Close() ;\r\n");
            sb.Append("\t}\r\n");
            return sb.ToString();
        }

        private string AddCatchQueryString()
        {
            StringBuilder sb = new StringBuilder();
            sb.Append("\ttry\r\n");
            sb.Append("\t{\r\n");
            sb.Append("\t\tsdaResult.Fill(ds) ;\r\n");
            sb.Append("\t}\r\n");
            sb.Append("\tcatch(Exception e)\r\n");
            sb.Append("\t{\r\n");
            sb.Append("\t\tthrow(new Exception(\"Error in the Database\"+e.Message)) ;\r\n");
            sb.Append("\t}\r\n");
            sb.Append("\tfinally\r\n");
            sb.Append("\t{\r\n");
            sb.Append("\t\tsdaResult.Dispose() ;\r\n");
            sb.Append("\t}\r\n");
            sb.Append("\treturn ds ;\r\n");
            return sb.ToString();
        } 

顺便说一下,文章开头的一段代码就是用这个程序生成的,当然,这种方法还有待完善的地方,希望大家指正。
原文连接:http://www.host01.com/article/Net/00020006/0561213181730059.htm
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