sqlsugar入门(1)-初识sugar正确打开sugar的方式

1、实例化DB

public static SqlSugarClient GetDB(string s)
        {
            var ssc = new SqlSugarClient(new ConnectionConfig()
            {
                ConnectionString = s, //必填
                DbType = SqlSugar.DbType.SqlServer, //必填
                IsAutoCloseConnection = true
            });
            ssc.SetExpMethods();
            ssc.SetEvents();
            return ssc;
        }

2、自定义扩展方法

public static void SetExpMethods(this SqlSugarClient ssc)
        {
            var expMethods = new List<SqlFuncExternal>();
            expMethods.Add(new SqlFuncExternal()
            {
                UniqueMethodName = "CastToFloat",
                MethodValue = (expInfo, dbType, expContext) =>
                {
                    if (dbType == DbType.SqlServer)
                        return string.Format("CAST({0} AS float)", expInfo.Args[0].MemberName);
                    else
                        throw new Exception("未实现");
                }
            });
　　　ssc.CurrentConnectionConfig.ConfigureExternalServices = new ConfigureExternalServices()
            {
                SqlFuncServices = expMethods //set ext method
            };
        }

3、AOP输出错误的sql

public static void SetEvents(this SqlSugarClient ssc)
        {
            ssc.Aop.OnError = error =>
            {
                Regex reg = new Regex(@"[^0-9]+");
                var sql = error.Sql;
                var pars = error.Parametres as SugarParameter[];
                sql = pars.OrderByDescending(o => reg.Replace(o.ParameterName, "").ObjToInt()).ThenByDescending(o => o.ParameterName.Length).Aggregate(sql, (current, p) => current.Replace(p.ParameterName, (p.DbType == System.Data.DbType.Decimal ||
                                                                                                                                                                p.DbType == System.Data.DbType.Double ||
                                                                                                                                                                p.DbType == System.Data.DbType.Int16 ||
                                                                                                                                                                p.DbType == System.Data.DbType.Int32 ||
                                                                                                                                                                p.DbType == System.Data.DbType.Int64 ||
                                                                                                                                                                p.DbType == System.Data.DbType.Single ||
                                                                                                                                                                p.DbType == System.Data.DbType.VarNumeric ||
                                                                                                                                                                p.DbType == System.Data.DbType.UInt16 ||
                                                                                                                                                                p.DbType == System.Data.DbType.UInt32 ||
                                                                                                                                                                p.DbType == System.Data.DbType.UInt64
                    ) ? (p.Value == null || p.Value is System.DBNull) ? "null" : string.Format("{0}", p.Value) : (p.Value == null || p.Value is System.DBNull) ? "null" : string.Format("'{0}'", p.Value)));

            };

        }

4、输出sql

public static string ToSqlString<T>(this ISugarQueryable<T> ISugarQueryable)
        {
            var tosql = ISugarQueryable.Clone().ToSql();
            Regex reg = new Regex(@"[^0-9]+");
            var sql = tosql.Key;
            var pars = tosql.Value;
            if (pars == null)
            {
                return sql;
            }
            sql = pars.OrderByDescending(o => reg.Replace(o.ParameterName, "").ObjToInt()).ThenByDescending(o => o.ParameterName.Length).Aggregate(sql, (current, p) => current.Replace(p.ParameterName, (p.DbType == System.Data.DbType.Decimal ||
                                                                                                                                                            p.DbType == System.Data.DbType.Double ||
                                                                                                                                                            p.DbType == System.Data.DbType.Int16 ||
                                                                                                                                                            p.DbType == System.Data.DbType.Int32 ||
                                                                                                                                                            p.DbType == System.Data.DbType.Int64 ||
                                                                                                                                                            p.DbType == System.Data.DbType.Single ||
                                                                                                                                                            p.DbType == System.Data.DbType.VarNumeric ||
                                                                                                                                                            p.DbType == System.Data.DbType.UInt16 ||
                                                                                                                                                            p.DbType == System.Data.DbType.UInt32 ||
                                                                                                                                                            p.DbType == System.Data.DbType.UInt64
                ) ? (p.Value == null || p.Value is System.DBNull) ? "null" : string.Format("{0}", p.Value) : (p.Value == null || p.Value is System.DBNull) ? "null" : string.Format("'{0}'", p.Value)));
            return sql;
        }

        public static string ToSqlString<T>(this IUpdateable<T> IUpdateable) where T : class, new()
        {
            var tosql = IUpdateable.ToSql();
            Regex reg = new Regex(@"[^0-9]+");
            var sql = tosql.Key;
            var pars = tosql.Value;
            if (pars == null)
            {
                return sql;
            }
            sql = pars.OrderByDescending(o => reg.Replace(o.ParameterName, "").ObjToInt()).ThenByDescending(o => o.ParameterName.Length).Aggregate(sql, (current, p) => current.Replace(p.ParameterName, (p.DbType == System.Data.DbType.Decimal ||
                                                                                                                                                            p.DbType == System.Data.DbType.Double ||
                                                                                                                                                            p.DbType == System.Data.DbType.Int16 ||
                                                                                                                                                            p.DbType == System.Data.DbType.Int32 ||
                                                                                                                                                            p.DbType == System.Data.DbType.Int64 ||
                                                                                                                                                            p.DbType == System.Data.DbType.Single ||
                                                                                                                                                            p.DbType == System.Data.DbType.VarNumeric ||
                                                                                                                                                            p.DbType == System.Data.DbType.UInt16 ||
                                                                                                                                                            p.DbType == System.Data.DbType.UInt32 ||
                                                                                                                                                            p.DbType == System.Data.DbType.UInt64
                ) ? (p.Value == null || p.Value is System.DBNull) ? "null" : string.Format("{0}", p.Value) : (p.Value == null || p.Value is System.DBNull) ? "null" : string.Format("'{0}'", p.Value)));
            return sql;
        }

        public static string ToSqlString<T>(this IDeleteable<T> IDeleteable) where T : class, new()
        {
            var tosql = IDeleteable.ToSql();
            Regex reg = new Regex(@"[^0-9]+");
            var sql = tosql.Key;
            var pars = tosql.Value;
            if (pars == null)
            {
                return sql;
            }
            sql = pars.OrderByDescending(o => reg.Replace(o.ParameterName, "").ObjToInt()).ThenByDescending(o => o.ParameterName.Length).Aggregate(sql, (current, p) => current.Replace(p.ParameterName, (p.DbType == System.Data.DbType.Decimal ||
                                                                                                                                                            p.DbType == System.Data.DbType.Double ||
                                                                                                                                                            p.DbType == System.Data.DbType.Int16 ||
                                                                                                                                                            p.DbType == System.Data.DbType.Int32 ||
                                                                                                                                                            p.DbType == System.Data.DbType.Int64 ||
                                                                                                                                                            p.DbType == System.Data.DbType.Single ||
                                                                                                                                                            p.DbType == System.Data.DbType.VarNumeric ||
                                                                                                                                                            p.DbType == System.Data.DbType.UInt16 ||
                                                                                                                                                            p.DbType == System.Data.DbType.UInt32 ||
                                                                                                                                                            p.DbType == System.Data.DbType.UInt64
                ) ? (p.Value == null || p.Value is System.DBNull) ? "null" : string.Format("{0}", p.Value) : (p.Value == null || p.Value is System.DBNull) ? "null" : string.Format("'{0}'", p.Value)));
            return sql;
        }

        public static string ToSqlString<T>(this IInsertable<T> IInsertable) where T : class, new()
        {
            var tosql = IInsertable.ToSql();
            Regex reg = new Regex(@"[^0-9]+");
            var sql = tosql.Key;
            var pars = tosql.Value;
            if (pars == null)
            {
                return sql;
            }
            sql = pars.OrderByDescending(o => reg.Replace(o.ParameterName, "").ObjToInt()).ThenByDescending(o => o.ParameterName.Length).Aggregate(sql, (current, p) => current.Replace(p.ParameterName, (p.DbType == System.Data.DbType.Decimal ||
                                                                                                                                                            p.DbType == System.Data.DbType.Double ||
                                                                                                                                                            p.DbType == System.Data.DbType.Int16 ||
                                                                                                                                                            p.DbType == System.Data.DbType.Int32 ||
                                                                                                                                                            p.DbType == System.Data.DbType.Int64 ||
                                                                                                                                                            p.DbType == System.Data.DbType.Single ||
                                                                                                                                                            p.DbType == System.Data.DbType.VarNumeric ||
                                                                                                                                                            p.DbType == System.Data.DbType.UInt16 ||
                                                                                                                                                            p.DbType == System.Data.DbType.UInt32 ||
                                                                                                                                                            p.DbType == System.Data.DbType.UInt64
                ) ? (p.Value == null || p.Value is System.DBNull) ? "null" : string.Format("{0}", p.Value) : (p.Value == null || p.Value is System.DBNull) ? "null" : string.Format("'{0}'", p.Value)));
            return sql;
        }

5、Demo地址：https://gitee.com/xuanyun2018/sqlsugardemo.git