初始提交: Gitea 项目代码

models/db/common.go

@@ -0,0 +1,55 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package db
+
+import (
+	"strings"
+
+	"gitea.dev/modules/setting"
+	"gitea.dev/modules/util"
+
+	"xorm.io/builder"
+)
+
+// BuildCaseInsensitiveLike returns a case-insensitive LIKE condition for the given key and value.
+// Cast the search value and the database column value to the same case for case-insensitive matching.
+// * SQLite: only cast ASCII chars because it doesn't handle complete Unicode case folding
+// * Other databases: use database's string function, assuming that they are able to handle complete Unicode case folding correctly
+func BuildCaseInsensitiveLike(key, value string) builder.Cond {
+	// ToLowerASCII is about 7% faster than ToUpperASCII (according to Golang's benchmark)
+	if setting.Database.Type.IsSQLite3() {
+		return builder.Like{"LOWER(" + key + ")", util.ToLowerASCII(value)}
+	}
+	return builder.Like{"LOWER(" + key + ")", strings.ToLower(value)}
+}
+
+// BuildCaseInsensitiveIn returns a condition to check if the given value is in the given values case-insensitively.
+// See BuildCaseInsensitiveLike for more details
+func BuildCaseInsensitiveIn(key string, values []string) builder.Cond {
+	incaseValues := make([]string, len(values))
+	caseCast := strings.ToLower
+	if setting.Database.Type.IsSQLite3() {
+		caseCast = util.ToLowerASCII
+	}
+	for i, value := range values {
+		incaseValues[i] = caseCast(value)
+	}
+	return builder.In("LOWER("+key+")", incaseValues)
+}
+
+// BuilderDialect returns the xorm.Builder dialect of the engine
+func BuilderDialect() string {
+	switch {
+	case setting.Database.Type.IsMySQL():
+		return builder.MYSQL
+	case setting.Database.Type.IsSQLite3():
+		return builder.SQLITE
+	case setting.Database.Type.IsPostgreSQL():
+		return builder.POSTGRES
+	case setting.Database.Type.IsMSSQL():
+		return builder.MSSQL
+	default:
+		return ""
+	}
+}