github.com/dolthub/go-mysql-server@v0.18.0/enginetest/mysqlshim/table_editor.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 mysqlshim
    16  
    17  import (
    18  	"fmt"
    19  	"strconv"
    20  	"strings"
    21  	"time"
    22  
    23  	"github.com/dolthub/go-mysql-server/sql"
    24  )
    25  
    26  // tableEditor is used as a sql.TableEditor.
    27  type tableEditor struct {
    28  	table Table
    29  	sch   sql.Schema
    30  }
    31  
    32  func (t *tableEditor) IndexedAccess(lookup sql.IndexLookup) sql.IndexedTable {
    33  	//TODO implement me
    34  	panic("implement me")
    35  }
    36  
    37  func (t *tableEditor) PreciseMatch() bool {
    38  	return true
    39  }
    40  
    41  func (t *tableEditor) GetIndexes(ctx *sql.Context) ([]sql.Index, error) {
    42  	//TODO implement me
    43  	panic("implement me")
    44  }
    45  
    46  var _ sql.TableEditor = (*tableEditor)(nil)
    47  var _ sql.ForeignKeyEditor = (*tableEditor)(nil)
    48  
    49  // StatementBegin implements the interface sql.TableEditor.
    50  func (t *tableEditor) StatementBegin(ctx *sql.Context) {
    51  	err := t.table.db.shim.Exec(t.table.db.name, "BEGIN;")
    52  	if err != nil {
    53  		panic(err)
    54  	}
    55  }
    56  
    57  // DiscardChanges implements the interface sql.TableEditor.
    58  func (t *tableEditor) DiscardChanges(ctx *sql.Context, errorEncountered error) error {
    59  	return t.table.db.shim.Exec(t.table.db.name, "ROLLBACK;")
    60  }
    61  
    62  // StatementComplete implements the interface sql.TableEditor.
    63  func (t *tableEditor) StatementComplete(ctx *sql.Context) error {
    64  	return t.table.db.shim.Exec(t.table.db.name, "COMMIT;")
    65  }
    66  
    67  // Insert implements the interface sql.RowInserter.
    68  func (t *tableEditor) Insert(ctx *sql.Context, row sql.Row) error {
    69  	sb := strings.Builder{}
    70  	for i, val := range row {
    71  		if i != 0 {
    72  			sb.WriteByte(',')
    73  		}
    74  		sb.WriteString(t.rowValToString(val))
    75  	}
    76  	return t.table.db.shim.Exec(t.table.db.name, fmt.Sprintf("INSERT INTO `%s` VALUES (%s);", t.table.name, sb.String()))
    77  }
    78  
    79  // Update implements the interface sql.RowUpdater.
    80  func (t *tableEditor) Update(ctx *sql.Context, old sql.Row, new sql.Row) error {
    81  	err := t.Delete(ctx, old)
    82  	if err != nil {
    83  		return err
    84  	}
    85  	return t.Insert(ctx, new)
    86  }
    87  
    88  // Delete implements the interface sql.RowDeleter.
    89  func (t *tableEditor) Delete(ctx *sql.Context, row sql.Row) error {
    90  	if len(row) != len(t.sch) {
    91  		return fmt.Errorf("expected `%d` values but got `%d` for DELETE", len(t.sch), len(row))
    92  	}
    93  	sb := strings.Builder{}
    94  	for i, val := range row {
    95  		if i != 0 {
    96  			sb.WriteString(" AND")
    97  		}
    98  		sb.WriteString(fmt.Sprintf(" `%s` = %s", t.sch[i].Name, t.rowValToString(val)))
    99  	}
   100  	return t.table.db.shim.Exec(t.table.db.name, fmt.Sprintf("DELETE FROM `%s` WHERE%s;", t.table.name, sb.String()))
   101  }
   102  
   103  // Close implements the interface sql.TableEditor.
   104  func (t *tableEditor) Close(ctx *sql.Context) error {
   105  	return nil
   106  }
   107  
   108  // rowValToString converts the given value from a sql.Row into a string representation.
   109  func (t *tableEditor) rowValToString(val interface{}) string {
   110  	switch val := val.(type) {
   111  	case bool:
   112  		if val {
   113  			return "true"
   114  		}
   115  		return "false"
   116  	case int:
   117  		return strconv.FormatInt(int64(val), 10)
   118  	case int8:
   119  		return strconv.FormatInt(int64(val), 10)
   120  	case int16:
   121  		return strconv.FormatInt(int64(val), 10)
   122  	case int32:
   123  		return strconv.FormatInt(int64(val), 10)
   124  	case int64:
   125  		return strconv.FormatInt(val, 10)
   126  	case uint:
   127  		return strconv.FormatUint(uint64(val), 10)
   128  	case uint8:
   129  		return strconv.FormatUint(uint64(val), 10)
   130  	case uint16:
   131  		return strconv.FormatUint(uint64(val), 10)
   132  	case uint32:
   133  		return strconv.FormatUint(uint64(val), 10)
   134  	case uint64:
   135  		return strconv.FormatUint(val, 10)
   136  	case float32:
   137  		return strconv.FormatFloat(float64(val), 'g', -1, 32)
   138  	case float64:
   139  		return strconv.FormatFloat(val, 'g', -1, 64)
   140  	case string:
   141  		return "'" + strings.ReplaceAll(val, "'", `\'`) + "'"
   142  	case []byte:
   143  		return "'" + strings.ReplaceAll(string(val), "'", `\'`) + "'"
   144  	case time.Time:
   145  		return "'" + val.Format("2006-01-02T15:04:05") + "'"
   146  	case nil:
   147  		return "NULL"
   148  	default:
   149  		panic(fmt.Errorf("unknown type: %T", val))
   150  	}
   151  }