github.com/dolthub/go-mysql-server@v0.18.0/sql/variables/validation.go (about)

     1  // Copyright 2023 Dolthub, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package variables
    16  
    17  import (
    18  	"fmt"
    19  
    20  	"github.com/dolthub/go-mysql-server/sql"
    21  )
    22  
    23  // validateCharacterSet is used in NotifyChange to validate that the given character set is valid.
    24  func validateCharacterSet(_ sql.SystemVariableScope, value sql.SystemVarValue) error {
    25  	charset, ok := value.Val.(string)
    26  	if !ok {
    27  		return fmt.Errorf("character set variables expect the `string` type, but received `%T`", value.Val)
    28  	}
    29  	_, err := sql.ParseCharacterSet(charset)
    30  	return err
    31  }
    32  
    33  // validateCollation is used in NotifyChange to validate that the given collation is valid.
    34  func validateCollation(_ sql.SystemVariableScope, value sql.SystemVarValue) error {
    35  	collation, ok := value.Val.(string)
    36  	if !ok {
    37  		return fmt.Errorf("collation variables expect the `string` type, but received `%T`", value.Val)
    38  	}
    39  	_, err := sql.ParseCollation(nil, &collation, false)
    40  	return err
    41  }