File: MySqlVendor.cs

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#region MIT license
// 
// MIT license
//
// Copyright (c) 2007-2008 Jiri Moudry, Pascal Craponne
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
// 
#endregion
using System;
using System.Data.Common;
using System.Linq;
using System.Collections.Generic;
using System.Text;
using System.Data.Linq.Mapping;
using System.Reflection;
using System.Data;
using DbLinq.Data.Linq;
using DbLinq.Data.Linq.SqlClient;
using DbLinq.Util;
using DbLinq.Vendor;

#if MONO_STRICT
using System.Data.Linq;
#else
using DbLinq.Data.Linq;
#endif

namespace DbLinq.MySql
{
    [Vendor(typeof(MySqlProvider))]
#if !MONO_STRICT
    public
#endif
    class MySqlVendor : Vendor.Implementation.Vendor
    {
        public override string VendorName { get { return "MySQL"; } }

        protected readonly MySqlSqlProvider sqlProvider = new MySqlSqlProvider();
        public override ISqlProvider SqlProvider { get { return sqlProvider; } }

        /// <summary>
        /// for large number of rows, we want to use BULK INSERT, 
        /// because it does not fill up the translation log.
        /// This is enabled for tables where Vendor.UserBulkInsert[db.Table] is true.
        /// </summary>
        public override void BulkInsert<T>(Table<T> table, List<T> rows, int pageSize, IDbTransaction transaction)
        {
            // name parameters we're going to insert
            var members = new Dictionary<string, MemberInfo>();
            var tableName = table.Context.Mapping.GetTable(typeof(T)).TableName;
            foreach (var dataMember in table.Context.Mapping.GetTable(typeof(T)).RowType.PersistentDataMembers)
            {
                members[dataMember.MappedName.Trim('"')] = dataMember.Member;
            }
            var columns = new List<string>(members.Keys);

            //PC: this is a test: when no page size specified, we manage to use less than 100 parameters
            if (pageSize == 0)
                pageSize = 99 / columns.Count;

            // performes INSERTs
            int lineIndex = 1;
            foreach (var page in Page.Paginate(rows, pageSize))
            {
                var valuesLists = new List<IList<string>>();
                using (var command = transaction.Connection.CreateCommand())
                {
                    foreach (T row in page)
                    {
                        var values = new List<string>();
                        foreach (var keyValue in members)
                        {
                            var parameter = command.CreateParameter();
                            parameter.ParameterName = SqlProvider.GetParameterName(string.Format("{0}_{1}", keyValue.Key, lineIndex));
                            parameter.SetValue(keyValue.Value.GetMemberValue(row));
                            values.Add(parameter.ParameterName);
                            command.Parameters.Add(parameter);
                        }
                        lineIndex++;
                        valuesLists.Add(values);
                    }
                    command.CommandText = sqlProvider.GetBulkInsert(SqlProvider.GetTable(tableName), columns,
                                                                    valuesLists);
                    var result = command.ExecuteNonQuery();
                }
            }
        }

#if OBSOLETE
        public override void DoBulkInsert<T>(Table<T> table, List<T> rows, IDbConnection connection)
        {
            int pageSize = UseBulkInsert[table];
            //ProjectionData projData = ProjectionData.FromReflectedType(typeof(T));
            ProjectionData projData = AttribHelper.GetProjectionData(typeof(T));
            TableAttribute tableAttrib = typeof(T).GetCustomAttributes(false).OfType<TableAttribute>().Single();

            //build "INSERT INTO products (ProductName, SupplierID, CategoryID, QuantityPerUnit)"
            string header = "INSERT INTO " + tableAttrib.Name + " " + InsertClauseBuilder.InsertRowHeader(projData);

            foreach (List<T> page in Page.Paginate(rows, pageSize))
            {
                int numFieldsAdded = 0;
                StringBuilder sbValues = new StringBuilder(" VALUES ");
                List<IDbDataParameter> paramList = new List<IDbDataParameter>();

                IDbCommand cmd = connection.CreateCommand();

                //package up all fields in N rows:
                string separator = "";
                foreach (T row in page)
                {
                    //prepare values = "(?P1, ?P2, ?P3, ?P4)"
                    string values =
                        InsertClauseBuilder.InsertRowFields(this, cmd, row, projData, paramList, ref numFieldsAdded);
                    sbValues.Append(separator).Append(values);
                    separator = ", ";
                }

                string sql = header + sbValues; //'INSET t1 (field1) VALUES (11),(12)'
                cmd.CommandText = sql;
                paramList.ForEach(param => cmd.Parameters.Add(param));

                int result = cmd.ExecuteNonQuery();
            }
        }
#endif
        /// <summary>
        /// call mysql stored proc or stored function, 
        /// optionally return DataSet, and collect return params.
        /// </summary>
        public override System.Data.Linq.IExecuteResult ExecuteMethodCall(DataContext context, MethodInfo method
                                                                 , params object[] inputValues)
        {
            if (method == null)
                throw new ArgumentNullException("L56 Null 'method' parameter");

            //check to make sure there is exactly one [FunctionEx]? that's below.
            //FunctionAttribute functionAttrib = GetFunctionAttribute(method);
            var functionAttrib = context.Mapping.GetFunction(method);

            ParameterInfo[] paramInfos = method.GetParameters();
            //int numRequiredParams = paramInfos.Count(p => p.IsIn || p.IsRetval);
            //if (numRequiredParams != inputValues.Length)
            //    throw new ArgumentException("L161 Argument count mismatch");

            string sp_name = functionAttrib.MappedName;

            // picrap: is there any way to abstract some part of this?
            using (IDbCommand command = context.Connection.CreateCommand())
            {
                command.CommandText = sp_name;
                //MySqlCommand command = new MySqlCommand("select hello0()");
                int currInputIndex = 0;

                List<string> paramNames = new List<string>();
                for (int i = 0; i < paramInfos.Length; i++)
                {
                    ParameterInfo paramInfo = paramInfos[i];

                    //TODO: check to make sure there is exactly one [Parameter]?
                    ParameterAttribute paramAttrib = paramInfo.GetCustomAttributes(false).OfType<ParameterAttribute>().Single();

                    string paramName = "?" + paramAttrib.Name; //eg. '?param1'
                    paramNames.Add(paramName);

                    System.Data.ParameterDirection direction = GetDirection(paramInfo, paramAttrib);
                    //MySqlDbType dbType = MySqlTypeConversions.ParseType(paramAttrib.DbType);
                    IDbDataParameter cmdParam = command.CreateParameter();
                    cmdParam.ParameterName = paramName;
                    //cmdParam.Direction = System.Data.ParameterDirection.Input;
                    if (direction == System.Data.ParameterDirection.Input || direction == System.Data.ParameterDirection.InputOutput)
                    {
                        object inputValue = inputValues[currInputIndex++];
                        cmdParam.Value = inputValue;
                    }
                    else
                    {
                        cmdParam.Value = null;
                    }
                    cmdParam.Direction = direction;
                    command.Parameters.Add(cmdParam);
                }

                if (!functionAttrib.IsComposable) // IsCompsable is false when we have a procedure
                {
                    //procedures: under the hood, this seems to prepend 'CALL '
                    command.CommandType = System.Data.CommandType.StoredProcedure;
                }
                else
                {
                    //functions: 'SELECT myFunction()' or 'SELECT hello(?s)'
                    string cmdText = "SELECT " + command.CommandText + "($args)";
                    cmdText = cmdText.Replace("$args", string.Join(",", paramNames.ToArray()));
                    command.CommandText = cmdText;
                }

                if (method.ReturnType == typeof(DataSet))
                {
                    //unknown shape of resultset:
                    System.Data.DataSet dataSet = new DataSet();
                    //IDataAdapter adapter = new MySqlDataAdapter((MySqlCommand)command);
                    IDbDataAdapter adapter = CreateDataAdapter(context);
                    adapter.SelectCommand = command;
                    adapter.Fill(dataSet);
                    List<object> outParamValues = CopyOutParams(paramInfos, command.Parameters);
                    return new ProcedureResult(dataSet, outParamValues.ToArray());
                }
                else
                {
                    object obj = command.ExecuteScalar();
                    List<object> outParamValues = CopyOutParams(paramInfos, command.Parameters);
                    return new ProcedureResult(obj, outParamValues.ToArray());
                }
            }
        }

        static System.Data.ParameterDirection GetDirection(ParameterInfo paramInfo, ParameterAttribute paramAttrib)
        {
            //strange hack to determine what's a ref, out parameter:
            //http://lists.ximian.com/pipermain/mono-list/2003-March/012751.html
            bool hasAmpersand = paramInfo.ParameterType.FullName.Contains('&');
            if (paramInfo.IsOut)
                return System.Data.ParameterDirection.Output;
            if (hasAmpersand)
                return System.Data.ParameterDirection.InputOutput;
            return System.Data.ParameterDirection.Input;
        }

        /// <summary>
        /// Collect all Out or InOut param values, casting them to the correct .net type.
        /// </summary>
        private List<object> CopyOutParams(ParameterInfo[] paramInfos, IDataParameterCollection paramSet)
        {
            List<object> outParamValues = new List<object>();
            //Type type_t = typeof(T);
            int i = -1;
            foreach (IDbDataParameter param in paramSet)
            {
                i++;
                if (param.Direction == System.Data.ParameterDirection.Input)
                {
                    outParamValues.Add("unused");
                    continue;
                }

                object val = param.Value;
                Type desired_type = paramInfos[i].ParameterType;

                if (desired_type.Name.EndsWith("&"))
                {
                    //for ref and out parameters, we need to tweak ref types, e.g.
                    // "System.Int32&, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"
                    string fullName1 = desired_type.AssemblyQualifiedName;
                    string fullName2 = fullName1.Replace("&", "");
                    desired_type = Type.GetType(fullName2);
                }
                try
                {
                    //fi.SetValue(t, val); //fails with 'System.Decimal cannot be converted to Int32'
                    //DbLinq.util.FieldUtils.SetObjectIdField(t, fi, val);
                    //object val2 = FieldUtils.CastValue(val, desired_type);
                    object val2 = TypeConvert.To(val, desired_type);
                    outParamValues.Add(val2);
                }
                catch (Exception)
                {
                    //fails with 'System.Decimal cannot be converted to Int32'
                    //Logger.Write(Level.Error, "CopyOutParams ERROR L245: failed on CastValue(): " + ex.Message);
                }
            }
            return outParamValues;
        }
    }
}