github.com/nakagami/firebirdsql@v0.9.10/transaction.go (about)

     1  /*******************************************************************************
     2  The MIT License (MIT)
     3  
     4  Copyright (c) 2013-2019 Hajime Nakagami
     5  
     6  Permission is hereby granted, free of charge, to any person obtaining a copy of
     7  this software and associated documentation files (the "Software"), to deal in
     8  the Software without restriction, including without limitation the rights to
     9  use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
    10  the Software, and to permit persons to whom the Software is furnished to do so,
    11  subject to the following conditions:
    12  
    13  The above copyright notice and this permission notice shall be included in all
    14  copies or substantial portions of the Software.
    15  
    16  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    17  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
    18  FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
    19  COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
    20  IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
    21  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
    22  *******************************************************************************/
    23  
    24  package firebirdsql
    25  
    26  type firebirdsqlTx struct {
    27  	fc             *firebirdsqlConn
    28  	isolationLevel int
    29  	isAutocommit   bool
    30  	transHandle    int32
    31  	needBegin      bool
    32  }
    33  
    34  func (tx *firebirdsqlTx) begin() (err error) {
    35  	var tpb []byte
    36  	switch tx.isolationLevel {
    37  	case ISOLATION_LEVEL_READ_COMMITED_LEGACY:
    38  		tpb = []byte{
    39  			byte(isc_tpb_version3),
    40  			byte(isc_tpb_write),
    41  			byte(isc_tpb_wait),
    42  			byte(isc_tpb_read_committed),
    43  			byte(isc_tpb_no_rec_version),
    44  		}
    45  	case ISOLATION_LEVEL_READ_COMMITED:
    46  		tpb = []byte{
    47  			byte(isc_tpb_version3),
    48  			byte(isc_tpb_write),
    49  			byte(isc_tpb_wait),
    50  			byte(isc_tpb_read_committed),
    51  			byte(isc_tpb_rec_version),
    52  		}
    53  	case ISOLATION_LEVEL_REPEATABLE_READ:
    54  		tpb = []byte{
    55  			byte(isc_tpb_version3),
    56  			byte(isc_tpb_write),
    57  			byte(isc_tpb_wait),
    58  			byte(isc_tpb_concurrency),
    59  		}
    60  	case ISOLATION_LEVEL_SERIALIZABLE:
    61  		tpb = []byte{
    62  			byte(isc_tpb_version3),
    63  			byte(isc_tpb_write),
    64  			byte(isc_tpb_wait),
    65  			byte(isc_tpb_consistency),
    66  		}
    67  	case ISOLATION_LEVEL_READ_COMMITED_RO:
    68  		tpb = []byte{
    69  			byte(isc_tpb_version3),
    70  			byte(isc_tpb_read),
    71  			byte(isc_tpb_wait),
    72  			byte(isc_tpb_read_committed),
    73  			byte(isc_tpb_rec_version),
    74  		}
    75  	}
    76  	err = tx.fc.wp.opTransaction(tpb)
    77  	if err != nil {
    78  		return
    79  	}
    80  	tx.transHandle, _, _, err = tx.fc.wp.opResponse()
    81  	tx.needBegin = false
    82  	tx.fc.transactionSet[tx] = struct{}{}
    83  	return
    84  }
    85  
    86  func (tx *firebirdsqlTx) commitRetainging() (err error) {
    87  	err = tx.fc.wp.opCommitRetaining(tx.transHandle)
    88  	if err != nil {
    89  		return
    90  	}
    91  	_, _, _, err = tx.fc.wp.opResponse()
    92  	tx.isAutocommit = tx.fc.isAutocommit
    93  	return
    94  }
    95  
    96  func (tx *firebirdsqlTx) Commit() (err error) {
    97  	err = tx.fc.wp.opCommit(tx.transHandle)
    98  	if err != nil {
    99  		return err
   100  	}
   101  	_, _, _, err = tx.fc.wp.opResponse()
   102  	tx.isAutocommit = tx.fc.isAutocommit
   103  	tx.needBegin = true
   104  	return
   105  }
   106  
   107  func (tx *firebirdsqlTx) Rollback() (err error) {
   108  	err = tx.fc.wp.opRollback(tx.transHandle)
   109  	if err != nil {
   110  		return nil
   111  	}
   112  	_, _, _, err = tx.fc.wp.opResponse()
   113  	tx.isAutocommit = tx.fc.isAutocommit
   114  	tx.needBegin = true
   115  	return
   116  }
   117  
   118  func newFirebirdsqlTx(fc *firebirdsqlConn, isolationLevel int, isAutocommit bool, withBegin bool) (tx *firebirdsqlTx, err error) {
   119  	tx = new(firebirdsqlTx)
   120  	tx.fc = fc
   121  	tx.isolationLevel = isolationLevel
   122  	tx.isAutocommit = isAutocommit
   123  	tx.needBegin = false
   124  
   125  	if withBegin {
   126  		err = tx.begin()
   127  
   128  		if err != nil {
   129  			return nil, err
   130  		}
   131  
   132  	} else {
   133  		tx.needBegin = true
   134  	}
   135  
   136  	return
   137  }