sqlite3 根据实体自动生成建表语句

public class BuildSqlTool

    {

        public static string GetCreateTableSql(object t)

        {

            //CREATE TABLE "StructureView2"("Id" INTEGER PRIMARY KEY  AUTOINCREMENT , "IdxNo" VARCHAR, "Name" VARCHAR, "Content" VARCHAR, "Price" FLOAT, "Order" INTEGER)

            string sqlStr = "CREATE TABLE \"{0}\" ({1})";

            Type type = t.GetType(); 

            PropertyInfo[] pi = type.GetProperties();

            string sqlFormat = "\"{0}\" {1}";

            string sqlStr2 = "";

            foreach (PropertyInfo p in pi)

            {

               string name=p.Name;

               object[]abc=p.GetCustomAttributes(true);

               if (name.ToLower()=="id")

               {

                   sqlStr2 += string.Format(sqlFormat, "Id", "INTEGER PRIMARY KEY  AUTOINCREMENT");

               }

               else

               {

                   sqlStr2 +=","+string.Format(sqlFormat, name, SqlType(p));

               } 

            }

            return string.Format(sqlStr, GetTableName(type), sqlStr2);

        }



        static string GetTableName(Type type)

        {

            var tableAttr = (TableAttribute)type.GetCustomAttributes(typeof(TableAttribute), true).FirstOrDefault();

            return tableAttr != null ? tableAttr.Name : type.Name;

        }



        static string SqlType(PropertyInfo p)

        {

            Type clrType = p.PropertyType;

            if (clrType == typeof(Boolean) || clrType == typeof(Byte) || clrType == typeof(UInt16) || clrType == typeof(SByte) || clrType == typeof(Int16) || clrType == typeof(Int32))

            {

                return "integer";

            }

            else if (clrType == typeof(UInt32) || clrType == typeof(Int64))

            {

                return "bigint";

            }

            else if (clrType == typeof(Single) || clrType == typeof(Double) || clrType == typeof(Decimal))

            {

                return "float";

            }

            else if (clrType == typeof(String))

            {

                return "varchar";

                //int len = MaxStringLength(p);

                //return "varchar(" + len + ")";

            }

            else if (clrType == typeof(DateTime))

            {

                return "datetime"; 

            }

            else if (clrType.IsEnum)

            { 

                return "integer";

            }

            else if (clrType == typeof(byte[]))

            {

                return "blob";

            }

            else if (clrType == typeof(Guid))

            {

                return "varchar(36)";

            }

            else

            {

                throw new NotSupportedException("Don't know about " + clrType);

            }

        }

         

        int MaxStringLength(PropertyInfo p)

        {

            var attrs = p.GetCustomAttributes(typeof(MaxLengthAttribute), true);

            if (attrs.Length > 0)

            {

                return ((MaxLengthAttribute)attrs[0]).Value;

            }

            else

            {

                return 140;

            }

        }

    }

 

 

主要目的是为了减少见表，同理，可自动生成orm的sql

使用范例

// 获取当前程序集
Assembly assembly = Assembly.GetExecutingAssembly();
// 创建类的实例，返回为 object 类型类的完全限定名（即包括命名空间）
object obj = assembly.CreateInstance("ConstructionBudget.Model.VModel1");
string sql = BuildSqlTool.GetCreateTableSql(obj);