github.com/matrixorigin/matrixone@v0.7.0/pkg/sql/parsers/tree/delete.go (about)

     1  // Copyright 2021 Matrix Origin
     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 tree
    16  
    17  // Delete statement
    18  type Delete struct {
    19  	statementImpl
    20  	Tables         TableExprs
    21  	TableRefs      TableExprs
    22  	PartitionNames IdentifierList
    23  	Where          *Where
    24  	OrderBy        OrderBy
    25  	Limit          *Limit
    26  	With           *With
    27  }
    28  
    29  func (node *Delete) Format(ctx *FmtCtx) {
    30  	if node.With != nil {
    31  		node.With.Format(ctx)
    32  		ctx.WriteByte(' ')
    33  	}
    34  	ctx.WriteString("delete from ")
    35  
    36  	prefix := ""
    37  	for _, a := range node.Tables {
    38  		ctx.WriteString(prefix)
    39  		a.Format(ctx)
    40  		prefix = ", "
    41  	}
    42  
    43  	if node.PartitionNames != nil {
    44  		ctx.WriteString(" partition(")
    45  		node.PartitionNames.Format(ctx)
    46  		ctx.WriteByte(')')
    47  	}
    48  
    49  	if node.TableRefs != nil {
    50  		ctx.WriteString(" using ")
    51  		node.TableRefs.Format(ctx)
    52  	}
    53  
    54  	if node.Where != nil {
    55  		ctx.WriteByte(' ')
    56  		node.Where.Format(ctx)
    57  	}
    58  	if len(node.OrderBy) > 0 {
    59  		ctx.WriteByte(' ')
    60  		node.OrderBy.Format(ctx)
    61  	}
    62  	if node.Limit != nil {
    63  		ctx.WriteByte(' ')
    64  		node.Limit.Format(ctx)
    65  	}
    66  }
    67  
    68  func (node *Delete) GetStatementType() string { return "Delete" }
    69  func (node *Delete) GetQueryType() string     { return QueryTypeDML }
    70  
    71  func NewDelete(ts TableExprs, w *Where, o OrderBy, l *Limit) *Delete {
    72  	return &Delete{
    73  		Tables:  ts,
    74  		Where:   w,
    75  		OrderBy: o,
    76  		Limit:   l,
    77  	}
    78  }