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- 优化 string Contains 模糊查找 % 的情况；

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This commit is contained in:
2881099
2022-06-29 21:59:46 +08:00
parent 81406ba37a
commit e10fb8ffe5
39 changed files with 447 additions and 131 deletions
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8
Providers/FreeSql.Provider.Odbc/MySql/OdbcMySqlExpression.cs
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@ -118,7 +118,7 @@ namespace FreeSql.Odbc.MySql
tsc.SetMapColumnTmp(null);
var args1 = getExp(callExp.Arguments[argIndex]);
var oldMapType = tsc.SetMapTypeReturnOld(tsc.mapTypeTmp);
var oldDbParams = objExp.NodeType == ExpressionType.MemberAccess ? tsc.SetDbParamsReturnOld(null) : null; //#900 UseGenerateCommandParameterWithLambda(true) 子查询 bug、以及 #1173 参数化 bug
var oldDbParams = objExp?.NodeType == ExpressionType.MemberAccess ? tsc.SetDbParamsReturnOld(null) : null; //#900 UseGenerateCommandParameterWithLambda(true) 子查询 bug、以及 #1173 参数化 bug
tsc.isNotSetMapColumnTmp = true;
var left = objExp == null ? null : getExp(objExp);
tsc.isNotSetMapColumnTmp = false;
@ -298,6 +298,12 @@ namespace FreeSql.Odbc.MySql
case "Contains":
var args0Value = getExp(exp.Arguments[0]);
if (args0Value == "NULL") return $"({left}) IS NULL";
if (args0Value.Contains("%"))
{
if (exp.Method.Name == "StartsWith") return $"locate({args0Value}, {left}) = 1";
if (exp.Method.Name == "EndsWith") return $"locate({args0Value}, {left}) = char_length({args0Value})";
return $"locate({args0Value}, {left}) > 0";
}
if (exp.Method.Name == "StartsWith") return $"({left}) LIKE {(args0Value.EndsWith("'") ? args0Value.Insert(args0Value.Length - 1, "%") : $"concat({args0Value}, '%')")}";
if (exp.Method.Name == "EndsWith") return $"({left}) LIKE {(args0Value.StartsWith("'") ? args0Value.Insert(1, "%") : $"concat('%', {args0Value})")}";
if (args0Value.StartsWith("'") && args0Value.EndsWith("'")) return $"({left}) LIKE {args0Value.Insert(1, "%").Insert(args0Value.Length, "%")}";