tk/FreeSql
1
0
Fork 0
mirror of https://github.com/nsnail/FreeSql.git synced 2025-11-04 17:20:49 +08:00
Code Issues Packages Projects Releases Wiki Activity

- 增加 Oracle/达梦 批量更新 BulkCopy 扩展方法；

Browse Source
This commit is contained in:
2881099
2023-03-16 09:08:29 +08:00
parent b0bac8efa7
commit 41ba6c37be
4 changed files with 128 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

57
Providers/FreeSql.Provider.Dameng/DamengExtensions.cs
View File

@@ -1,6 +1,11 @@
using Dm;
using FreeSql;
using FreeSql.Internal.CommonProvider;
using FreeSql.Internal.Model;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
public static partial class FreeSqlDamengGlobalExtensions
{
@@ -15,6 +20,58 @@ public static partial class FreeSqlDamengGlobalExtensions
static FreeSql.Dameng.DamengAdo _damengAdo = new FreeSql.Dameng.DamengAdo();
#region ExecuteDmBulkCopy
/// <summary>
/// 批量更新（更新字段数量超过 2000 时收益大）<para></para>
/// 实现原理：使用 OracleBulkCopy 插入临时表，再使用 MERGE INTO 联表更新
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="that"></param>
/// <returns></returns>
public static int ExecuteDmBulkCopy<T>(this IUpdate<T> that) where T : class
{
var update = that as UpdateProvider<T>;
if (update._source.Any() != true || update._tempPrimarys.Any() == false) return 0;
var state = ExecuteDmBulkCopyState(update);
return UpdateProvider.ExecuteBulkUpdate(update, state, insert => insert.ExecuteDmBulkCopy());
}
static NativeTuple<string, string, string, string, string[]> ExecuteDmBulkCopyState<T>(UpdateProvider<T> update) where T : class
{
if (update._source.Any() != true) return null;
var _table = update._table;
var _commonUtils = update._commonUtils;
var updateTableName = update._tableRule?.Invoke(_table.DbName) ?? _table.DbName;
var tempTableName = $"Temp_{Guid.NewGuid().ToString("N").ToUpper().Substring(0, 24)}";
if (update._orm.CodeFirst.IsSyncStructureToLower) tempTableName = tempTableName.ToLower();
if (update._orm.CodeFirst.IsSyncStructureToUpper) tempTableName = tempTableName.ToUpper();
if (update._connection == null && update._orm.Ado.TransactionCurrentThread != null)
update.WithTransaction(update._orm.Ado.TransactionCurrentThread);
var sb = new StringBuilder().Append("CREATE GLOBAL TEMPORARY TABLE ").Append(_commonUtils.QuoteSqlName(tempTableName)).Append(" ( ");
var setColumns = new List<string>();
var pkColumns = new List<string>();
foreach (var col in _table.Columns.Values)
{
if (update._tempPrimarys.Any(a => a.CsName == col.CsName)) pkColumns.Add(col.Attribute.Name);
else if (col.Attribute.IsIdentity == false && col.Attribute.IsVersion == false && update._ignore.ContainsKey(col.Attribute.Name) == false) setColumns.Add(col.Attribute.Name);
else continue;
sb.Append(" \r\n ").Append(_commonUtils.QuoteSqlName(col.Attribute.Name)).Append(" ").Append(col.Attribute.DbType.Replace("NOT NULL", ""));
sb.Append(",");
}
var sql1 = sb.Remove(sb.Length - 1, 1).Append("\r\n) ON COMMIT PRESERVE ROWS").ToString();
sb.Clear().Append("MERGE INTO ").Append(_commonUtils.QuoteSqlName(updateTableName)).Append(" a ")
.Append(" \r\nUSING ").Append(_commonUtils.QuoteSqlName(tempTableName)).Append(" b ON (").Append(string.Join(" AND ", pkColumns.Select(col => $"a.{_commonUtils.QuoteSqlName(col)} = b.{_commonUtils.QuoteSqlName(col)}")))
.Append(") \r\nWHEN MATCHED THEN")
.Append(" \r\nUPDATE SET ").Append(string.Join(", \r\n ", setColumns.Select(col => $"{_commonUtils.QuoteSqlName(col)} = b.{_commonUtils.QuoteSqlName(col)}")));
var sql2 = sb.ToString();
sb.Clear();
var sql3 = $"BEGIN \r\n" +
$"execute immediate 'TRUNCATE TABLE {_commonUtils.QuoteSqlName(tempTableName)}';\r\n" +
$"execute immediate 'DROP TABLE {_commonUtils.QuoteSqlName(tempTableName)}';\r\n" +
$"END;";
return NativeTuple.Create(sql1, sql2, sql3, tempTableName, pkColumns.Concat(setColumns).ToArray());
}
/// <summary>
/// 达梦 CopyBulk 批量插入功能<para></para>
/// 使用 IgnoreColumns/InsertColumns 设置忽略/指定导入的列<para></para>