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using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Configuration;
using System.Data;
using System.Data.Common;
using System.Dynamic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data.SqlClient;
using System.Text.RegularExpressions;
namespace Massive {
public static class ObjectExtensions {
/// <summary>
/// Extension method for adding in a bunch of parameters
/// </summary>
public static void AddParams(this DbCommand cmd, params object[] args) {
foreach (var item in args) {
AddParam(cmd, item);
}
}
/// <summary>
/// Extension for adding single parameter
/// </summary>
public static void AddParam(this DbCommand cmd, object item) {
var p = cmd.CreateParameter();
p.ParameterName = string.Format("@{0}", cmd.Parameters.Count);
if (item == null) {
p.Value = DBNull.Value;
} else {
if (item.GetType() == typeof(Guid)) {
p.Value = item.ToString();
p.DbType = DbType.String;
p.Size = 4000;
} else if (item.GetType() == typeof(ExpandoObject)) {
var d = (IDictionary<string, object>)item;
p.Value = d.Values.FirstOrDefault();
} else {
p.Value = item;
}
if (item.GetType() == typeof(string))
p.Size = ((string)item).Length > 4000 ? -1 : 4000;
}
cmd.Parameters.Add(p);
}
/// <summary>
/// Turns an IDataReader to a Dynamic list of things
/// </summary>
public static List<dynamic> ToExpandoList(this IDataReader rdr) {
var result = new List<dynamic>();
while (rdr.Read()) {
result.Add(rdr.RecordToExpando());
}
return result;
}
public static dynamic RecordToExpando(this IDataReader rdr) {
dynamic e = new ExpandoObject();
var d = e as IDictionary<string, object>;
for (int i = 0; i < rdr.FieldCount; i++)
d.Add(rdr.GetName(i), DBNull.Value.Equals(rdr[i]) ? null : rdr[i]);
return e;
}
/// <summary>
/// Turns the object into an ExpandoObject
/// </summary>
public static dynamic ToExpando(this object o) {
var result = new ExpandoObject();
var d = result as IDictionary<string, object>; //work with the Expando as a Dictionary
if (o.GetType() == typeof(ExpandoObject)) return o; //shouldn't have to... but just in case
if (o.GetType() == typeof(NameValueCollection) || o.GetType().IsSubclassOf(typeof(NameValueCollection))) {
var nv = (NameValueCollection)o;
nv.Cast<string>().Select(key => new KeyValuePair<string, object>(key, nv[key])).ToList().ForEach(i => d.Add(i));
} else {
var props = o.GetType().GetProperties();
foreach (var item in props) {
d.Add(item.Name, item.GetValue(o, null));
}
}
return result;
}
/// <summary>
/// Turns the object into a Dictionary
/// </summary>
public static IDictionary<string, object> ToDictionary(this object thingy) {
return (IDictionary<string, object>)thingy.ToExpando();
}
}
/// <summary>
/// Convenience class for opening/executing data
/// </summary>
public static class DB {
public static DynamicModel Current {
get {
if (ConfigurationManager.ConnectionStrings.Count > 1) {
return new DynamicModel(ConfigurationManager.ConnectionStrings[1].Name);
}
throw new InvalidOperationException("Need a connection string name - can't determine what it is");
}
}
}
/// <summary>
/// A class that wraps your database table in Dynamic Funtime
/// </summary>
public class DynamicModel : DynamicObject {
DbProviderFactory _factory;
string ConnectionString;
public static DynamicModel Open(string connectionStringName) {
dynamic dm = new DynamicModel(connectionStringName);
return dm;
}
public DynamicModel(string connectionStringName, string tableName = "",
string primaryKeyField = "", string descriptorField = "") {
TableName = tableName == "" ? this.GetType().Name : tableName;
PrimaryKeyField = string.IsNullOrEmpty(primaryKeyField) ? "ID" : primaryKeyField;
DescriptorField = descriptorField;
var _providerName = "System.Data.SqlClient";
if (!string.IsNullOrWhiteSpace(ConfigurationManager.ConnectionStrings[connectionStringName].ProviderName))
_providerName = ConfigurationManager.ConnectionStrings[connectionStringName].ProviderName;
_factory = DbProviderFactories.GetFactory(_providerName);
ConnectionString = ConfigurationManager.ConnectionStrings[connectionStringName].ConnectionString;
}
/// <summary>
/// Creates a new Expando from a Form POST - white listed against the columns in the DB
/// </summary>
public dynamic CreateFrom(NameValueCollection coll) {
dynamic result = new ExpandoObject();
var dc = (IDictionary<string, object>)result;
var schema = Schema;
//loop the collection, setting only what's in the Schema
foreach (var item in coll.Keys) {
var exists = schema.Any(x => x.COLUMN_NAME.ToLower() == item.ToString().ToLower());
if (exists) {
var key = item.ToString();
var val = coll[key];
dc.Add(key, val);
}
}
return result;
}
/// <summary>
/// Gets a default value for the column
/// </summary>
public dynamic DefaultValue(dynamic column) {
dynamic result = null;
string def = column.COLUMN_DEFAULT;
if (String.IsNullOrEmpty(def)) {
result = null;
} else if (def == "getdate()" || def == "(getdate())") {
result = DateTime.Now.ToShortDateString();
} else if (def == "newid()") {
result = Guid.NewGuid().ToString();
} else {
result = def.Replace("(", "").Replace(")", "");
}
return result;
}
/// <summary>
/// Creates an empty Expando set with defaults from the DB
/// </summary>
public dynamic Prototype {
get {
dynamic result = new ExpandoObject();
var schema = Schema;
foreach (dynamic column in schema) {
var dc = (IDictionary<string, object>)result;
dc.Add(column.COLUMN_NAME, DefaultValue(column));
}
result._Table = this;
return result;
}
}
public string DescriptorField { get; protected set; }
/// <summary>
/// List out all the schema bits for use with ... whatever
/// </summary>
IEnumerable<dynamic> _schema;
public IEnumerable<dynamic> Schema {
get {
if (_schema == null)
_schema = Query("SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = @0", TableName);
return _schema;
}
}
/// <summary>
/// Enumerates the reader yielding the result - thanks to Jeroen Haegebaert
/// </summary>
public virtual IEnumerable<dynamic> Query(string sql, params object[] args) {
using (var conn = OpenConnection()) {
var rdr = CreateCommand(sql, conn, args).ExecuteReader();
while (rdr.Read()) {
yield return rdr.RecordToExpando(); ;
}
}
}
public virtual IEnumerable<dynamic> Query(string sql, DbConnection connection, params object[] args) {
using (var rdr = CreateCommand(sql, connection, args).ExecuteReader()) {
while (rdr.Read()) {
yield return rdr.RecordToExpando(); ;
}
}
}
/// <summary>
/// Returns a single result
/// </summary>
public virtual object Scalar(string sql, params object[] args) {
object result = null;
using (var conn = OpenConnection()) {
result = CreateCommand(sql, conn, args).ExecuteScalar();
}
return result;
}
/// <summary>
/// Creates a DBCommand that you can use for loving your database.
/// </summary>
DbCommand CreateCommand(string sql, DbConnection conn, params object[] args) {
var result = _factory.CreateCommand();
result.Connection = conn;
result.CommandText = sql;
if (args.Length > 0)
result.AddParams(args);
return result;
}
/// <summary>
/// Returns and OpenConnection
/// </summary>
public virtual DbConnection OpenConnection() {
var result = _factory.CreateConnection();
result.ConnectionString = ConnectionString;
result.Open();
return result;
}
/// <summary>
/// Builds a set of Insert and Update commands based on the passed-on objects.
/// These objects can be POCOs, Anonymous, NameValueCollections, or Expandos. Objects
/// With a PK property (whatever PrimaryKeyField is set to) will be created at UPDATEs
/// </summary>
public virtual List<DbCommand> BuildCommands(params object[] things) {
var commands = new List<DbCommand>();
foreach (var item in things) {
if (HasPrimaryKey(item)) {
commands.Add(CreateUpdateCommand(item.ToExpando(), GetPrimaryKey(item)));
} else {
commands.Add(CreateInsertCommand(item.ToExpando()));
}
}
return commands;
}
public virtual int Execute(DbCommand command) {
return Execute(new DbCommand[] { command });
}
public virtual int Execute(string sql, params object[] args) {
return Execute(CreateCommand(sql, null, args));
}
/// <summary>
/// Executes a series of DBCommands in a transaction
/// </summary>
public virtual int Execute(IEnumerable<DbCommand> commands) {
var result = 0;
using (var conn = OpenConnection()) {
using (var tx = conn.BeginTransaction()) {
foreach (var cmd in commands) {
cmd.Connection = conn;
cmd.Transaction = tx;
result += cmd.ExecuteNonQuery();
}
tx.Commit();
}
}
return result;
}
public virtual string PrimaryKeyField { get; set; }
/// <summary>
/// Conventionally introspects the object passed in for a field that
/// looks like a PK. If you've named your PrimaryKeyField, this becomes easy
/// </summary>
public virtual bool HasPrimaryKey(object o) {
return o.ToDictionary().ContainsKey(PrimaryKeyField);
}
/// <summary>
/// If the object passed in has a property with the same name as your PrimaryKeyField
/// it is returned here.
/// </summary>
public virtual object GetPrimaryKey(object o) {
object result = null;
o.ToDictionary().TryGetValue(PrimaryKeyField, out result);
return result;
}
public virtual string TableName { get; set; }
/// <summary>
/// Returns all records complying with the passed-in WHERE clause and arguments,
/// ordered as specified, limited (TOP) by limit.
/// </summary>
public virtual IEnumerable<dynamic> All(string where = "", string orderBy = "", int limit = 0, string columns = "*", params object[] args) {
string sql = BuildSelect(where, orderBy, limit);
return Query(string.Format(sql, columns, TableName), args);
}
private static string BuildSelect(string where, string orderBy, int limit) {
string sql = limit > 0 ? "SELECT TOP " + limit + " {0} FROM {1} " : "SELECT {0} FROM {1} ";
if (!string.IsNullOrEmpty(where))
sql += where.Trim().StartsWith("where", StringComparison.OrdinalIgnoreCase) ? where : " WHERE " + where;
if (!String.IsNullOrEmpty(orderBy))
sql += orderBy.Trim().StartsWith("order by", StringComparison.OrdinalIgnoreCase) ? orderBy : " ORDER BY " + orderBy;
return sql;
}
/// <summary>
/// Returns a dynamic PagedResult. Result properties are Items, TotalPages, and TotalRecords.
/// </summary>
public virtual dynamic Paged(string where = "", string orderBy = "", string columns = "*", int pageSize = 20, int currentPage = 1, params object[] args)
{
return BuildPagedResult(where: where, orderBy: orderBy, columns: columns, pageSize: pageSize, currentPage: currentPage, args: args);
}
public virtual dynamic Paged(string sql, string primaryKey, string where = "", string orderBy = "", string columns = "*", int pageSize = 20, int currentPage = 1, params object[] args)
{
return BuildPagedResult(sql, primaryKey, where, orderBy, columns, pageSize, currentPage, args);
}
private dynamic BuildPagedResult(string sql = "", string primaryKeyField = "", string where = "", string orderBy = "", string columns = "*", int pageSize = 20, int currentPage = 1, params object[] args)
{
dynamic result = new ExpandoObject();
var countSQL = "";
if (!string.IsNullOrEmpty(sql))
countSQL = string.Format("SELECT COUNT({0}) FROM ({1}) AS PagedTable", primaryKeyField, sql);
else
countSQL = string.Format("SELECT COUNT({0}) FROM {1}", PrimaryKeyField, TableName);
if (String.IsNullOrEmpty(orderBy))
{
orderBy = string.IsNullOrEmpty(primaryKeyField) ? PrimaryKeyField : primaryKeyField;
}
if (!string.IsNullOrEmpty(where))
{
if (!where.Trim().StartsWith("where", StringComparison.CurrentCultureIgnoreCase))
{
where = " WHERE " + where;
}
}
var query = "";
if (!string.IsNullOrEmpty(sql))
query = string.Format("SELECT {0} FROM (SELECT ROW_NUMBER() OVER (ORDER BY {1}) AS Row, {0} FROM ({2}) AS PagedTable {3}) AS Paged ", columns, orderBy, sql, where);
else
query = string.Format("SELECT {0} FROM (SELECT ROW_NUMBER() OVER (ORDER BY {1}) AS Row, {0} FROM {2} {3}) AS Paged ", columns, orderBy, TableName, where);
var pageStart = (currentPage - 1) * pageSize;
query += string.Format(" WHERE Row > {0} AND Row <={1}", pageStart, (pageStart + pageSize));
countSQL += where;
result.TotalRecords = Scalar(countSQL, args);
result.TotalPages = result.TotalRecords / pageSize;
if (result.TotalRecords % pageSize > 0)
result.TotalPages += 1;
result.Items = Query(string.Format(query, columns, TableName), args);
return result;
}
/// <summary>
/// Returns a single row from the database
/// </summary>
public virtual dynamic Single(string where, params object[] args) {
var sql = string.Format("SELECT * FROM {0} WHERE {1}", TableName, where);
return Query(sql, args).FirstOrDefault();
}
/// <summary>
/// Returns a single row from the database
/// </summary>
public virtual dynamic Single(object key, string columns = "*") {
var sql = string.Format("SELECT {0} FROM {1} WHERE {2} = @0", columns, TableName, PrimaryKeyField);
return Query(sql, key).FirstOrDefault();
}
/// <summary>
/// This will return a string/object dictionary for dropdowns etc
/// </summary>
public virtual IDictionary<string, object> KeyValues(string orderBy = "") {
if (String.IsNullOrEmpty(DescriptorField))
throw new InvalidOperationException("There's no DescriptorField set - do this in your constructor to describe the text value you want to see");
var sql = string.Format("SELECT {0},{1} FROM {2} ", PrimaryKeyField, DescriptorField, TableName);
if (!String.IsNullOrEmpty(orderBy))
sql += "ORDER BY " + orderBy;
var results = Query(sql).ToList().Cast<IDictionary<string, object>>();
return results.ToDictionary(key => key[PrimaryKeyField].ToString(), value => value[DescriptorField]);
}
/// <summary>
/// This will return an Expando as a Dictionary
/// </summary>
public virtual IDictionary<string, object> ItemAsDictionary(ExpandoObject item) {
return (IDictionary<string, object>)item;
}
//Checks to see if a key is present based on the passed-in value
public virtual bool ItemContainsKey(string key, ExpandoObject item) {
var dc = ItemAsDictionary(item);
return dc.ContainsKey(key);
}
/// <summary>
/// Executes a set of objects as Insert or Update commands based on their property settings, within a transaction.
/// These objects can be POCOs, Anonymous, NameValueCollections, or Expandos. Objects
/// With a PK property (whatever PrimaryKeyField is set to) will be created at UPDATEs
/// </summary>
public virtual int Save(params object[] things) {
foreach (var item in things) {
if (!IsValid(item)) {
throw new InvalidOperationException("Can't save this item: " + String.Join("; ", Errors.ToArray()));
}
}
var commands = BuildCommands(things);
return Execute(commands);
}
public virtual DbCommand CreateInsertCommand(dynamic expando) {
DbCommand result = null;
var settings = (IDictionary<string, object>)expando;
var sbKeys = new StringBuilder();
var sbVals = new StringBuilder();
var stub = "INSERT INTO {0} ({1}) \r\n VALUES ({2})";
result = CreateCommand(stub, null);
int counter = 0;
foreach (var item in settings) {
sbKeys.AppendFormat("{0},", item.Key);
sbVals.AppendFormat("@{0},", counter.ToString());
result.AddParam(item.Value);
counter++;
}
if (counter > 0) {
var keys = sbKeys.ToString().Substring(0, sbKeys.Length - 1);
var vals = sbVals.ToString().Substring(0, sbVals.Length - 1);
var sql = string.Format(stub, TableName, keys, vals);
result.CommandText = sql;
} else throw new InvalidOperationException("Can't parse this object to the database - there are no properties set");
return result;
}
/// <summary>
/// Creates a command for use with transactions - internal stuff mostly, but here for you to play with
/// </summary>
public virtual DbCommand CreateUpdateCommand(dynamic expando, object key) {
var settings = (IDictionary<string, object>)expando;
var sbKeys = new StringBuilder();
var stub = "UPDATE {0} SET {1} WHERE {2} = @{3}";
var args = new List<object>();
var result = CreateCommand(stub, null);
int counter = 0;
foreach (var item in settings) {
var val = item.Value;
if (!item.Key.Equals(PrimaryKeyField, StringComparison.OrdinalIgnoreCase) && item.Value != null) {
result.AddParam(val);
sbKeys.AppendFormat("{0} = @{1}, \r\n", item.Key, counter.ToString());
counter++;
}
}
if (counter > 0) {
//add the key
result.AddParam(key);
//strip the last commas
var keys = sbKeys.ToString().Substring(0, sbKeys.Length - 4);
result.CommandText = string.Format(stub, TableName, keys, PrimaryKeyField, counter);
} else throw new InvalidOperationException("No parsable object was sent in - could not divine any name/value pairs");
return result;
}
/// <summary>
/// Creates a command for use with transactions - internal stuff mostly, but here for you to play with
/// </summary>
public virtual DbCommand CreateUpdateWhereCommand(dynamic expando, string where = "", params object[] args)
{
var settings = (IDictionary<string, object>)expando;
var sbKeys = new StringBuilder();
string stub;
if (!string.IsNullOrEmpty(where))
{
stub = where.Trim().StartsWith("where", StringComparison.OrdinalIgnoreCase) ? "UPDATE {0} SET {1} " : "UPDATE {0} SET {1} WHERE ";
stub += where;
}
else
{
stub = "UPDATE {0} SET {1}";
}
var result = CreateCommand(stub, null, args);
// not sure if we should do regex over where to count params... @ followed by number
int counter = args.Length > 0 ? args.Length : 0;
foreach (var item in settings) {
var val = item.Value;
if (!item.Key.Equals(PrimaryKeyField, StringComparison.OrdinalIgnoreCase) && item.Value != null) {
result.AddParam(val);
sbKeys.AppendFormat("{0} = @{1}, \r\n", item.Key, counter.ToString());
counter++;
}
}
if (counter > 0) {
//strip the last commas
var keys = sbKeys.ToString().Substring(0, sbKeys.Length - 4);
result.CommandText = string.Format(stub, TableName, keys);
} else throw new InvalidOperationException("No parsable object was sent in - could not divine any name/value pairs");
return result;
}
/// <summary>
/// Removes one or more records from the DB according to the passed-in WHERE
/// </summary>
public virtual DbCommand CreateDeleteCommand(string where = "", object key = null, params object[] args) {
var sql = string.Format("DELETE FROM {0} ", TableName);
if (key != null) {
sql += string.Format("WHERE {0}=@0", PrimaryKeyField);
args = new object[] { key };
} else if (!string.IsNullOrEmpty(where)) {
sql += where.Trim().StartsWith("where", StringComparison.OrdinalIgnoreCase) ? where : "WHERE " + where;
}
return CreateCommand(sql, null, args);
}
public bool IsValid(dynamic item) {
Errors.Clear();
Validate(item);
return Errors.Count == 0;
}
//Temporary holder for error messages
public IList<string> Errors = new List<string>();
/// <summary>
/// Adds a record to the database. You can pass in an Anonymous object, an ExpandoObject,
/// A regular old POCO, or a NameValueColletion from a Request.Form or Request.QueryString
/// </summary>
public virtual dynamic Insert(object o) {
var ex = o.ToExpando();
if (!IsValid(ex)) {
throw new InvalidOperationException("Can't insert: " + String.Join("; ", Errors.ToArray()));
}
if (BeforeSave(ex)) {
using (dynamic conn = OpenConnection()) {
var cmd = CreateInsertCommand(ex);
cmd.Connection = conn;
cmd.ExecuteNonQuery();
cmd.CommandText = "SELECT SCOPE_IDENTITY() as newID";
ex.ID = cmd.ExecuteScalar();
Inserted(ex);
}
return ex;
} else {
return null;
}
}
/// <summary>
/// Updates a record in the database. You can pass in an Anonymous object, an ExpandoObject,
/// A regular old POCO, or a NameValueCollection from a Request.Form or Request.QueryString
/// </summary>
public virtual int Update(object o, object key) {
var ex = o.ToExpando();
if (!IsValid(ex)) {
throw new InvalidOperationException("Can't Update: " + String.Join("; ", Errors.ToArray()));
}
var result = 0;
if (BeforeSave(ex)) {
result = Execute(CreateUpdateCommand(ex, key));
Updated(ex);
}
return result;
}
/// <summary>
/// Updates a all records in the database that match where clause. You can pass in an Anonymous object, an ExpandoObject,
/// A regular old POCO, or a NameValueCollection from a Request.Form or Request.QueryString. Where works same same as
/// in All().
/// </summary>
/// <returns>
/// 0 - if no records updated or if you did fall into this method accenditently by passing null or "" to Update(object, object) method.
/// n - number of records updated
/// </returns>
public virtual int Update(object o, string where = "1=1", params object[] args)
{
if (string.IsNullOrWhiteSpace(where))
{
return 0;
}
var ex = o.ToExpando();
if (!IsValid(ex)) {
throw new InvalidOperationException("Can't Update: " + String.Join("; ", Errors.ToArray()));
}
var result = 0;
if (BeforeSave(ex)) {
result = Execute(CreateUpdateWhereCommand(ex, where, args));
Updated(ex);
}
return result;
}
/// <summary>
/// Removes one or more records from the DB according to the passed-in WHERE
/// </summary>
public int Delete(object key = null, string where = "", params object[] args) {
var deleted = this.Single(key);
var result = 0;
if (BeforeDelete(deleted)) {
result = Execute(CreateDeleteCommand(where: where, key: key, args: args));
Deleted(deleted);
}
return result;
}
public void DefaultTo(string key, object value, dynamic item) {
if (!ItemContainsKey(key, item)) {
var dc = (IDictionary<string, object>)item;
dc[key] = value;
}
}
//Hooks
public virtual void Validate(dynamic item) { }
public virtual void Inserted(dynamic item) { }
public virtual void Updated(dynamic item) { }
public virtual void Deleted(dynamic item) { }
public virtual bool BeforeDelete(dynamic item) { return true; }
public virtual bool BeforeSave(dynamic item) { return true; }
//validation methods
public virtual void ValidatesPresenceOf(object value, string message = "Required") {
if (value == null)
Errors.Add(message);
if (String.IsNullOrEmpty(value.ToString()))
Errors.Add(message);
}
//fun methods
public virtual void ValidatesNumericalityOf(object value, string message = "Should be a number") {
var type = value.GetType().Name;
var numerics = new string[] { "Int32", "Int16", "Int64", "Decimal", "Double", "Single", "Float" };
if (!numerics.Contains(type)) {
Errors.Add(message);
}
}
public virtual void ValidateIsCurrency(object value, string message = "Should be money") {
if (value == null)
Errors.Add(message);
decimal val = decimal.MinValue;
decimal.TryParse(value.ToString(), out val);
if (val == decimal.MinValue)
Errors.Add(message);
}
public int Count() {
return Count(TableName);
}
public int Count(string tableName, string where="", params object[] args) {
return (int)Scalar("SELECT COUNT(*) FROM " + tableName+" "+ where, args);
}
/// <summary>
/// A helpful query tool
/// </summary>
public override bool TryInvokeMember(InvokeMemberBinder binder, object[] args, out object result) {
//parse the method
var constraints = new List<string>();
var counter = 0;
var info = binder.CallInfo;
// accepting named args only... SKEET!
if (info.ArgumentNames.Count != args.Length) {
throw new InvalidOperationException("Please use named arguments for this type of query - the column name, orderby, columns, etc");
}
//first should be "FindBy, Last, Single, First"
var op = binder.Name;
var columns = " * ";
string orderBy = string.Format(" ORDER BY {0}", PrimaryKeyField);
string sql = "";
string where = "";
var whereArgs = new List<object>();
//loop the named args - see if we have order, columns and constraints
if (info.ArgumentNames.Count > 0) {
for (int i = 0; i < args.Length; i++) {
var name = info.ArgumentNames[i].ToLower();
switch (name) {
case "orderby":
orderBy = " ORDER BY " + args[i];
break;
case "columns":
columns = args[i].ToString();
break;
default:
constraints.Add(string.Format(" {0} = @{1}", name, counter));
whereArgs.Add(args[i]);
counter++;
break;
}
}
}
//Build the WHERE bits
if (constraints.Count > 0) {
where = " WHERE " + string.Join(" AND ", constraints.ToArray());
}
//probably a bit much here but... yeah this whole thing needs to be refactored...
if (op.ToLower() == "count") {
result = Scalar("SELECT COUNT(*) FROM " + TableName + where, whereArgs.ToArray());
} else if (op.ToLower() == "sum") {
result = Scalar("SELECT SUM(" + columns + ") FROM " + TableName + where, whereArgs.ToArray());
} else if (op.ToLower() == "max") {
result = Scalar("SELECT MAX(" + columns + ") FROM " + TableName + where, whereArgs.ToArray());
} else if (op.ToLower() == "min") {
result = Scalar("SELECT MIN(" + columns + ") FROM " + TableName + where, whereArgs.ToArray());
} else if (op.ToLower() == "avg") {
result = Scalar("SELECT AVG(" + columns + ") FROM " + TableName + where, whereArgs.ToArray());
} else {
//build the SQL
sql = "SELECT TOP 1 " + columns + " FROM " + TableName + where;
var justOne = op.StartsWith("First") || op.StartsWith("Last") || op.StartsWith("Get") || op.StartsWith("Single");
//Be sure to sort by DESC on the PK (PK Sort is the default)
if (op.StartsWith("Last")) {
orderBy = orderBy + " DESC ";
} else {
//default to multiple
sql = "SELECT " + columns + " FROM " + TableName + where;
}
if (justOne) {
//return a single record
result = Query(sql + orderBy, whereArgs.ToArray()).FirstOrDefault();
} else {
//return lots
result = Query(sql + orderBy, whereArgs.ToArray());
}
}
return true;
}
}
}
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