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

     1  // Copyright 2021 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 plan
    16  
    17  import (
    18  	"fmt"
    19  
    20  	"github.com/dolthub/go-mysql-server/sql"
    21  )
    22  
    23  // DeclareCondition represents the DECLARE ... CONDITION statement.
    24  type DeclareCondition struct {
    25  	Name          string
    26  	MysqlErrCode  int64
    27  	SqlStateValue string
    28  }
    29  
    30  var _ sql.Node = (*DeclareCondition)(nil)
    31  var _ sql.CollationCoercible = (*DeclareCondition)(nil)
    32  
    33  // NewDeclareCondition returns a *DeclareCondition node.
    34  func NewDeclareCondition(name string, errCode int64, sqlStateValue string) *DeclareCondition {
    35  	return &DeclareCondition{
    36  		Name:          name,
    37  		MysqlErrCode:  errCode,
    38  		SqlStateValue: sqlStateValue,
    39  	}
    40  }
    41  
    42  // Resolved implements the sql.Node interface.
    43  func (d *DeclareCondition) Resolved() bool {
    44  	return true
    45  }
    46  
    47  func (d *DeclareCondition) IsReadOnly() bool {
    48  	return true
    49  }
    50  
    51  // String implements the sql.Node interface.
    52  func (d *DeclareCondition) String() string {
    53  	val := ""
    54  	if d.SqlStateValue != "" {
    55  		val = fmt.Sprintf("SQLSTATE '%s'", d.SqlStateValue)
    56  	} else {
    57  		val = fmt.Sprintf("%d", d.MysqlErrCode)
    58  	}
    59  	return fmt.Sprintf("DECLARE %s CONDITION FOR %s", d.Name, val)
    60  }
    61  
    62  // Schema implements the sql.Node interface.
    63  func (d *DeclareCondition) Schema() sql.Schema {
    64  	return nil
    65  }
    66  
    67  // Children implements the sql.Node interface.
    68  func (d *DeclareCondition) Children() []sql.Node {
    69  	return nil
    70  }
    71  
    72  // WithChildren implements the sql.Node interface.
    73  func (d *DeclareCondition) WithChildren(children ...sql.Node) (sql.Node, error) {
    74  	return NillaryWithChildren(d, children...)
    75  }
    76  
    77  // CheckPrivileges implements the interface sql.Node.
    78  func (d *DeclareCondition) CheckPrivileges(ctx *sql.Context, opChecker sql.PrivilegedOperationChecker) bool {
    79  	return true
    80  }
    81  
    82  // CollationCoercibility implements the interface sql.CollationCoercible.
    83  func (*DeclareCondition) CollationCoercibility(ctx *sql.Context) (collation sql.CollationID, coercibility byte) {
    84  	return sql.Collation_binary, 7
    85  }
    86  
    87  // RowIter implements the sql.Node interface.
    88  func (d *DeclareCondition) RowIter(ctx *sql.Context, row sql.Row) (sql.RowIter, error) {
    89  	return sql.RowsToRowIter(), nil
    90  }