github.com/matrixorigin/matrixone@v1.2.0/pkg/sql/parsers/tree/txn.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  // the read and write mode for a transaction.
    18  type ReadWriteMode int
    19  
    20  const (
    21  	READ_WRITE_MODE_NONE ReadWriteMode = iota
    22  	READ_WRITE_MODE_READ_ONLY
    23  	READ_WRITE_MODE_READ_WRITE
    24  )
    25  
    26  // modes for a transaction
    27  type TransactionModes struct {
    28  	RwMode ReadWriteMode
    29  }
    30  
    31  func (node *TransactionModes) Format(ctx *FmtCtx) {
    32  	switch node.RwMode {
    33  	case READ_WRITE_MODE_READ_ONLY:
    34  		ctx.WriteString("read only")
    35  	case READ_WRITE_MODE_READ_WRITE:
    36  		ctx.WriteString("read write")
    37  	}
    38  }
    39  
    40  func MakeTransactionModes(rwm ReadWriteMode) TransactionModes {
    41  	return TransactionModes{RwMode: rwm}
    42  }
    43  
    44  // Begin statement
    45  type BeginTransaction struct {
    46  	statementImpl
    47  	Modes TransactionModes
    48  }
    49  
    50  func (node *BeginTransaction) Format(ctx *FmtCtx) {
    51  	ctx.WriteString("start transaction")
    52  	if node.Modes.RwMode != READ_WRITE_MODE_NONE {
    53  		ctx.WriteByte(' ')
    54  		node.Modes.Format(ctx)
    55  	}
    56  }
    57  
    58  func (node *BeginTransaction) GetStatementType() string { return "Start Transaction" }
    59  func (node *BeginTransaction) GetQueryType() string     { return QueryTypeTCL }
    60  
    61  func NewBeginTransaction(m TransactionModes) *BeginTransaction {
    62  	return &BeginTransaction{Modes: m}
    63  }
    64  
    65  type CompletionType int
    66  
    67  const (
    68  	COMPLETION_TYPE_NO_CHAIN CompletionType = iota
    69  	COMPLETION_TYPE_CHAIN
    70  	COMPLETION_TYPE_RELEASE
    71  )
    72  
    73  // Commit statement
    74  type CommitTransaction struct {
    75  	statementImpl
    76  	Type CompletionType
    77  }
    78  
    79  func (node *CommitTransaction) Format(ctx *FmtCtx) {
    80  	ctx.WriteString("commit")
    81  }
    82  
    83  func (node *CommitTransaction) GetStatementType() string { return "Commit" }
    84  func (node *CommitTransaction) GetQueryType() string     { return QueryTypeTCL }
    85  
    86  func NewCommitTransaction(t CompletionType) *CommitTransaction {
    87  	return &CommitTransaction{Type: t}
    88  }
    89  
    90  // Rollback statement
    91  type RollbackTransaction struct {
    92  	statementImpl
    93  	Type CompletionType
    94  }
    95  
    96  func (node *RollbackTransaction) Format(ctx *FmtCtx) {
    97  	ctx.WriteString("rollback")
    98  }
    99  
   100  func (node *RollbackTransaction) GetStatementType() string { return "Rollback" }
   101  func (node *RollbackTransaction) GetQueryType() string     { return QueryTypeTCL }
   102  
   103  func NewRollbackTransaction(t CompletionType) *RollbackTransaction {
   104  	return &RollbackTransaction{Type: t}
   105  }