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- 优化 IUpdate 批量 case when 同值的 SQL 生成；#1393

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This commit is contained in:
2881099
2023-01-06 01:59:28 +08:00
parent 050a00104a
commit 1d9cd1f59d
10 changed files with 46 additions and 129 deletions
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14
FreeSql/Internal/CommonProvider/UpdateProvider.cs
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@ -846,7 +846,9 @@ namespace FreeSql.Internal.CommonProvider
var sb = new StringBuilder();
sb.Append(_commonUtils.QuoteSqlName(col.Attribute.Name)).Append(" = ");
var nulls = 0;
string valsqlOld = null;
var valsqlOldStats = 1; //start 1
var nullStats = 0;
var cwsb = new StringBuilder().Append(cw);
foreach (var d in _source)
{
@ -854,11 +856,15 @@ namespace FreeSql.Internal.CommonProvider
ToSqlWhen(cwsb, _tempPrimarys, d);
cwsb.Append(" THEN ");
var val = col.GetDbValue(d);
cwsb.Append(thenValue(_commonUtils.RewriteColumn(col, _commonUtils.GetNoneParamaterSqlValue(_paramsSource, "u", col, col.Attribute.MapType, val))));
if (val == null || val == DBNull.Value) nulls++;
var valsql = thenValue(_commonUtils.RewriteColumn(col, _commonUtils.GetNoneParamaterSqlValue(_paramsSource, "u", col, col.Attribute.MapType, val)));
cwsb.Append(valsql);
if (valsqlOld == null) valsqlOld = valsql;
else if (valsqlOld == valsql) valsqlOldStats++;
if (val == null || val == DBNull.Value) nullStats++;
}
cwsb.Append(" END");
if (nulls == _source.Count) sb.Append("NULL");
if (nullStats == _source.Count) sb.Append("NULL");
else if (valsqlOldStats == _source.Count) sb.Append(valsqlOld);
else sb.Append(cwsb);
cwsb.Clear();