实现数据库的映射实体的代码生成器代码,C#代码库,德仔网

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【C#】实现数据库的映射实体的代码生成器
作者:玉玲 / 发布于2016/9/14/ 834
private void CreateModel()
        {
            string connectionString = "server=127.0.0.1;port=3306;User Id=root;Password=root;database=ipbroadcast;Connect Timeout=60;Treat Tiny As Boolean=False";
            MySql.Data.MySqlClient.MySqlConnection conn = new MySql.Data.MySqlClient.MySqlConnection(connectionString);
            conn.Open();
            DataTable table = conn.GetSchema("TABLES");
            foreach (DataRow row in table.Rows)
            {
                DataTable sheetTable = GetSchemaTable(conn, row);
                string tName = row["TABLE_NAME"].ToString();
                CreateEntityFile(conn, tName, sheetTable);
            }
            conn.Close();
        }

        private DataTable GetSchemaTable(MySqlConnection conn, DataRow row)
        {
            string sheetName = row["TABLE_Name"].ToString();
            MySqlCommand com = conn.CreateCommand();
            com.CommandType = CommandType.Text;
            com.CommandText = "Select * From " + sheetName;
            IDataReader reader = com.ExecuteReader(CommandBehavior.SchemaOnly);
            DataTable table = reader.GetSchemaTable();
            com.Dispose();
            reader.Close();
            return table;
        }

        private void CreateEntityFile(MySqlConnection conn, string tName, DataTable table)
        {
            //定义生成文件的路径
            string tableName = tName;
            string schemaName = "";
            string colName = "";
            string path = @"F:\IPBroadcastModel\Model1";
            if (!Directory.Exists(path))
                Directory.CreateDirectory(path);

            MySqlCommand com = conn.CreateCommand();
            com.CommandType = CommandType.Text;
            Dictionary<string, string> dict = new Dictionary<string, string>();
            bool isGetComment = false;

            //写文件
            string clsName = "Ety" + tableName.Substring(3, 1).ToUpper() + tableName.Substring(4);
            string fileName = clsName + ".cs";
            string fullName = Path.Combine(path, fileName);

            using (FileStream fs = new FileStream(fullName, FileMode.Create))
            {
                StreamWriter sw = new StreamWriter(fs, Encoding.UTF8);
                sw.WriteLine("using System;");
                sw.WriteLine("using System.Text;");
                sw.WriteLine("using System.Collections.Generic; ");
                sw.WriteLine("using System.Data;");
                sw.WriteLine("namespace AEBell.DBManager");
                sw.WriteLine("{");
                sw.WriteLine("\t[Serializable]");
                sw.WriteLine("\tpublic class " + clsName);
                sw.WriteLine("\t{");
                foreach (DataRow row in table.Rows)
                {
                    //tableName = row["BaseTableName"].ToString();
                    colName = row["ColumnName"].ToString();
                    schemaName = row["BaseSchemaName"].ToString();
                    if (!isGetComment)
                    {
                        isGetComment = true;
                        GetFielComment(tableName, schemaName, com, dict);
                    }

                    sw.WriteLine("\t\t/// <summary>");
                    sw.WriteLine("\t\t/// " + dict[colName]);
                    sw.WriteLine("\t\t/// </summary>");

                    Type info = row["DataType"] as Type;
                    string declear = info.Name;
                    if (declear.ToUpper() == "SBYTE")   //为了适应动软。
                        declear = "Byte";
                    bool isNull = (bool)row["AllowDBNull"];
                    if (isNull && info.BaseType.Name == "ValueType")
                        declear += "?";

                    sw.WriteLine("\t\tpublic " + declear + " " + colName.Substring(0, 1).ToUpper() + colName.Substring(1));
                    sw.WriteLine("\t\t{");
                    sw.WriteLine("\t\t\tget;");
                    sw.WriteLine("\t\t\tset;");
                    sw.WriteLine("\t\t}");
                }
                sw.WriteLine("\t}");
                sw.WriteLine("}");
                sw.Close();
            }
        }

        private static void GetFielComment(string tableName, string schemaName, MySqlCommand com, Dictionary<string, string> dict)
        {
            string comment = "";
            com.CommandText = "Select COLUMN_NAME,DATA_TYPE, COLUMN_COMMENT From  INFORMATION_SCHEMA.COLUMNS where table_name ='"
                + tableName + "' AND table_schema = '" + schemaName + "'"; // AND column_name LIKE '" + colName + "'";
            IDataReader reader = com.ExecuteReader();
            while (reader.Read())
            {
                string colName = reader.GetString(0);
                comment = reader.GetString(2);
                dict[colName] = comment;
            }

            reader.Close();
        }
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