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- 增加 IInsertOrUpdate 高性能方法 ExecuteOracleBulkCopy/ExecuteDmBulkCopy；

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This commit is contained in:
2881099
2023-03-25 14:50:13 +08:00
parent 07602192a7
commit 09f3f1a20c
7 changed files with 112 additions and 19 deletions
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51
Providers/FreeSql.Provider.Dameng/DamengExtensions.cs
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@ -20,10 +20,57 @@ public static partial class FreeSqlDamengGlobalExtensions
static FreeSql.Dameng.DamengAdo _damengAdo = new FreeSql.Dameng.DamengAdo();
#region ExecuteDmBulkCopy
/// <summary>
/// 批量插入或更新（操作的字段数量超过 2000 时收益大）<para></para>
/// 实现原理：使用 DmBulkCopy 插入临时表，再执行 MERGE INTO t1 using (select * from #temp) ...
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="that"></param>
/// <returns></returns>
public static int ExecuteDmBulkCopy<T>(this IInsertOrUpdate<T> that) where T : class
{
var upsert = that as InsertOrUpdateProvider<T>;
if (upsert._source.Any() != true || upsert._tempPrimarys.Any() == false) return 0;
var state = ExecuteDmBulkCopyState(upsert);
return UpdateProvider.ExecuteBulkUpsert(upsert, state, insert => insert.ExecuteDmBulkCopy());
}
static NativeTuple<string, string, string, string, string[]> ExecuteDmBulkCopyState<T>(InsertOrUpdateProvider<T> upsert) where T : class
{
if (upsert._source.Any() != true) return null;
var _table = upsert._table;
var _commonUtils = upsert._commonUtils;
var updateTableName = upsert._tableRule?.Invoke(_table.DbName) ?? _table.DbName;
var tempTableName = $"Temp_{Guid.NewGuid().ToString("N").ToUpper().Substring(0, 24)}";
if (upsert._orm.CodeFirst.IsSyncStructureToLower) tempTableName = tempTableName.ToLower();
if (upsert._orm.CodeFirst.IsSyncStructureToUpper) tempTableName = tempTableName.ToUpper();
if (upsert._connection == null && upsert._orm.Ado.TransactionCurrentThread != null)
upsert.WithTransaction(upsert._orm.Ado.TransactionCurrentThread);
var sb = new StringBuilder().Append("CREATE GLOBAL TEMPORARY TABLE ").Append(_commonUtils.QuoteSqlName(tempTableName)).Append(" ( ");
foreach (var col in _table.Columns.Values)
{
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();
try
{
upsert._sourceSql = $"select * from {tempTableName}";
var sql2 = upsert.ToSql();
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, _table.Columns.Values.Select(a => a.Attribute.Name).ToArray());
}
finally
{
upsert._sourceSql = null;
}
}
/// <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
/// 实现原理：使用 DmBulkCopy 插入临时表，再使用 MERGE INTO 联表更新
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="that"></param>