Support DuckDb BulkCopy

Src/Asp.NetCore2/SqlSugar.DuckDBCore/DuckDB/SqlBuilder/DuckDBFastBuilder.cs

@@ -3,6 +3,8 @@ using DuckDB.NET.Data;
 using System;
 using System.Collections.Generic;
 using System.Data;
+using System.Data.Common;
+using System.Globalization;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
@@ -11,9 +13,124 @@ namespace SqlSugar.DuckDB
 {
     public class DuckDBFastBuilder : FastBuilder, IFastBuilder
     {
-        public Task<int> ExecuteBulkCopyAsync(DataTable dt)
+        public async Task<int> ExecuteBulkCopyAsync(DataTable dt)
         {
-            throw new NotImplementedException();
+            // 移除自增列  
+            var identities = this.FastEntityInfo.Columns.Where(it => it.IsIdentity).Select(it => it.DbColumnName).ToList();
+            foreach (var identity in identities)
+            {
+                if (dt.Columns.Contains(identity))
+                {
+                    dt.Columns.Remove(identity);
+                }
+            }
+
+            await BulkInsertToDuckDB((DuckDBConnection)this.Context.Ado.Connection, dt.TableName, dt, this.Context.Ado.IsNoTran());
+            return dt.Rows.Count;
+        }
+        public async Task BulkInsertToDuckDB(DuckDBConnection conn, string tableName, DataTable table, bool isTran)
+        {
+            DbTransaction? transaction = null;
+            var isAutoClose = this.Context.CurrentConnectionConfig.IsAutoCloseConnection;
+            if (isAutoClose)
+            {
+                this.Context.CurrentConnectionConfig.IsAutoCloseConnection = false;
+            }
+
+            try
+            {
+                if (conn.State != ConnectionState.Open)
+                {
+                    conn.Open();
+                }
+
+                if (isTran)
+                {
+                    transaction = await conn.BeginTransactionAsync();
+                } 
+                // 构造 INSERT 语句
+                var columnNames = string.Join(", ", table.Columns.Cast<DataColumn>().Select(c => c.ColumnName));
+                var valuePlaceholders = string.Join(", ", table.Rows.Cast<DataRow>().Select(row =>
+                    $"({string.Join(", ", row.ItemArray.Select(item=>FormatValue(item)))})"
+                ));
+
+                var insertSql = $"INSERT INTO {tableName} ({columnNames}) VALUES {valuePlaceholders}";
+
+                using var cmd = conn.CreateCommand();
+                cmd.CommandText = insertSql;
+
+                // 执行批量插入
+                await cmd.ExecuteNonQueryAsync();
+
+                if (isTran)
+                {
+                    await transaction!.CommitAsync();
+                }
+            }
+            catch
+            {
+                if (isTran && transaction != null)
+                {
+                    await transaction.RollbackAsync();
+                }
+
+                throw;
+            }
+            finally
+            {
+                if (isTran && transaction != null)
+                {
+                    transaction?.Dispose();
+                }
+                this.Context.CurrentConnectionConfig.IsAutoCloseConnection = isAutoClose;
+            }
+        }
+        public object FormatValue(object value)
+        {
+            if (value == null||value==DBNull.Value)
+            {
+                return "NULL";
+            }
+            else
+            {
+                var type = value.GetType();
+                if (type == UtilConstants.DateType)
+                {
+                    return Convert.ToDateTime(value).ToString("yyyy-MM-dd HH:mm:ss.ms").ToSqlValue();
+                }
+                else if (type == UtilConstants.ByteArrayType)
+                {
+                    string bytesString = "0x" + BitConverter.ToString((byte[])value);
+                    return bytesString;
+                }
+                else if (type.IsEnum())
+                {
+                    if (this.Context.CurrentConnectionConfig.MoreSettings?.TableEnumIsString == true)
+                    {
+                        return value.ToSqlValue();
+                    }
+                    else
+                    {
+                        return Convert.ToInt64(value);
+                    }
+                } 
+                else if (type == UtilConstants.BoolType)
+                {
+                    return value.ObjToBool() ? "1" : "0";
+                }
+                else if (type == UtilConstants.StringType || type == UtilConstants.ObjType)
+                {
+                    return "'" + value.ToString().ToSqlFilter() + "'";
+                }
+                else if (value is decimal v)
+                {
+                    return v.ToString(CultureInfo.InvariantCulture);
+                }
+                else
+                {
+                    return "'" + value.ToString() + "'";
+                }
+            }
         }
     }
 }

Src/Asp.NetCore2/SqlSugar.DuckDBCore/main.nuspec

@@ -2,7 +2,7 @@
 <package >
   <metadata>
     <id>SqlSugar.DuckDBCore</id>
-    <version>5.1.4.189</version>
+    <version>5.1.4.191</version>
     <authors>sunkaixuan</authors>
     <owners>果糖大数据</owners>
     <licenseUrl>http://www.apache.org/licenses/LICENSE-2.0.html</licenseUrl>