## v0.9.18

- 增加 PostgreSQL 的 Odbc 访问提供，相比 FreeSql.Provider.PostgreSQL 支持的类型更少；
- 增加 通用的 Odbc 访问提供，不能迁移实体到数据库，不能 Skip 这样来分页，理论上能 crud 所有 odbc 数据库；

Providers/FreeSql.Provider.Odbc/Default/OdbcProvider.cs

@@ -0,0 +1,113 @@
+using FreeSql.Internal;
+using FreeSql.Internal.CommonProvider;
+using System;
+using System.Collections.Generic;
+using System.Collections.Concurrent;
+using System.Linq;
+using FreeSql.Odbc.Default;
+
+namespace FreeSql.Odbc.Default
+{
+
+    public class OdbcProvider<TMark> : IFreeSql<TMark>
+    {
+
+        public ISelect<T1> Select<T1>() where T1 : class => new OdbcSelect<T1>(this, this.InternalCommonUtils, this.InternalCommonExpression, null);
+        public ISelect<T1> Select<T1>(object dywhere) where T1 : class => new OdbcSelect<T1>(this, this.InternalCommonUtils, this.InternalCommonExpression, dywhere);
+        public IInsert<T1> Insert<T1>() where T1 : class => new OdbcInsert<T1>(this, this.InternalCommonUtils, this.InternalCommonExpression);
+        public IInsert<T1> Insert<T1>(T1 source) where T1 : class => this.Insert<T1>().AppendData(source);
+        public IInsert<T1> Insert<T1>(T1[] source) where T1 : class => this.Insert<T1>().AppendData(source);
+        public IInsert<T1> Insert<T1>(IEnumerable<T1> source) where T1 : class => this.Insert<T1>().AppendData(source);
+        public IUpdate<T1> Update<T1>() where T1 : class => new OdbcUpdate<T1>(this, this.InternalCommonUtils, this.InternalCommonExpression, null);
+        public IUpdate<T1> Update<T1>(object dywhere) where T1 : class => new OdbcUpdate<T1>(this, this.InternalCommonUtils, this.InternalCommonExpression, dywhere);
+        public IDelete<T1> Delete<T1>() where T1 : class => new OdbcDelete<T1>(this, this.InternalCommonUtils, this.InternalCommonExpression, null);
+        public IDelete<T1> Delete<T1>(object dywhere) where T1 : class => new OdbcDelete<T1>(this, this.InternalCommonUtils, this.InternalCommonExpression, dywhere);
+
+        public IAdo Ado { get; }
+        public IAop Aop { get; }
+        public ICodeFirst CodeFirst { get; }
+        public IDbFirst DbFirst => throw new NotImplementedException("FreeSql.Odbc.Default 未实现该功能");
+
+        /// <summary>
+        /// 生成一个普通访问功能的 IFreeSql 对象，用来访问 odbc 
+        /// </summary>
+        /// <param name="masterConnectionString"></param>
+        /// <param name="slaveConnectionString"></param>
+        /// <param name="adapter">适配器</param>
+        public OdbcProvider(string masterConnectionString, string[] slaveConnectionString)
+        {
+            this.InternalCommonUtils = new OdbcUtils(this);
+            this.InternalCommonExpression = new OdbcExpression(this.InternalCommonUtils);
+
+            this.Ado = new OdbcAdo(this.InternalCommonUtils, masterConnectionString, slaveConnectionString);
+            this.Aop = new AopProvider();
+
+            this.CodeFirst = new OdbcCodeFirst(this, this.InternalCommonUtils, this.InternalCommonExpression);
+
+            var _utils = InternalCommonUtils as OdbcUtils;
+            //处理 MaxLength
+            this.Aop.ConfigEntityProperty += new EventHandler<Aop.ConfigEntityPropertyEventArgs>((s, e) =>
+            {
+                object[] attrs = null;
+                try
+                {
+                    attrs = e.Property.GetCustomAttributes(false).ToArray(); //.net core 反射存在版本冲突问题，导致该方法异常
+                }
+                catch { }
+
+                var maxlenAttr = attrs.Where(a => {
+                    return ((a as Attribute)?.TypeId as Type)?.Name == "MaxLengthAttribute";
+                }).FirstOrDefault();
+                if (maxlenAttr != null)
+                {
+                    var lenProp = maxlenAttr.GetType().GetProperties().Where(a => a.PropertyType.IsNumberType()).FirstOrDefault();
+                    if (lenProp != null && int.TryParse(string.Concat(lenProp.GetValue(maxlenAttr, null)), out var tryval))
+                    {
+                        if (tryval != 0)
+                        {
+                            switch (this.Ado.DataType)
+                            {
+                                case DataType.Sqlite:
+                                    e.ModifyResult.DbType = tryval > 0 ? $"{_utils.Adapter.MappingOdbcTypeVarChar}({tryval})" : _utils.Adapter.MappingOdbcTypeText;
+                                    break;
+                            }
+                        }
+                    }
+                }
+            });
+        }
+
+        internal CommonUtils InternalCommonUtils { get; }
+        internal CommonExpression InternalCommonExpression { get; }
+
+        public void Transaction(Action handler) => Ado.Transaction(handler);
+
+        public void Transaction(Action handler, TimeSpan timeout) => Ado.Transaction(handler, timeout);
+
+        ~OdbcProvider()
+        {
+            this.Dispose();
+        }
+        bool _isdisposed = false;
+        public void Dispose()
+        {
+            if (_isdisposed) return;
+            try
+            {
+                (this.Ado as AdoProvider)?.Dispose();
+            }
+            finally
+            {
+                FreeSqlOdbcGlobalExtensions._dicOdbcAdater.TryRemove(this as IFreeSql, out var tryada);
+            }
+        }
+    }
+}
+
+partial class FreeSqlOdbcGlobalExtensions
+{
+    internal static OdbcAdapter DefaultOdbcAdapter = new OdbcAdapter();
+    internal static ConcurrentDictionary<IFreeSql, OdbcAdapter> _dicOdbcAdater = new ConcurrentDictionary<IFreeSql, OdbcAdapter>();
+    public static void SetOdbcAdapter(this IFreeSql that, OdbcAdapter adapter) => _dicOdbcAdater.AddOrUpdate(that, adapter, (fsql, old) => adapter);
+    internal static OdbcAdapter GetOdbcAdapter(this IFreeSql that) => _dicOdbcAdater.TryGetValue(that, out var tryada) ? tryada : DefaultOdbcAdapter;
+}