vitess.io/vitess@v0.16.2/go/vt/vitessdriver/rows.go (about)

     1  /*
     2  Copyright 2019 The Vitess Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package vitessdriver
    18  
    19  import (
    20  	"database/sql"
    21  	"database/sql/driver"
    22  	"io"
    23  	"reflect"
    24  	"time"
    25  
    26  	"vitess.io/vitess/go/sqltypes"
    27  	"vitess.io/vitess/go/vt/proto/query"
    28  )
    29  
    30  // rows creates a database/sql/driver compliant Row iterator
    31  // for a non-streaming QueryResult.
    32  type rows struct {
    33  	convert *converter
    34  	qr      *sqltypes.Result
    35  	index   int
    36  }
    37  
    38  // newRows creates a new rows from qr.
    39  func newRows(qr *sqltypes.Result, c *converter) driver.Rows {
    40  	return &rows{qr: qr, convert: c}
    41  }
    42  
    43  func (ri *rows) Columns() []string {
    44  	cols := make([]string, 0, len(ri.qr.Fields))
    45  	for _, field := range ri.qr.Fields {
    46  		cols = append(cols, field.Name)
    47  	}
    48  	return cols
    49  }
    50  
    51  func (ri *rows) Close() error {
    52  	return nil
    53  }
    54  
    55  func (ri *rows) Next(dest []driver.Value) error {
    56  	if ri.index == len(ri.qr.Rows) {
    57  		return io.EOF
    58  	}
    59  	if err := ri.convert.populateRow(dest, ri.qr.Rows[ri.index]); err != nil {
    60  		return err
    61  	}
    62  	ri.index++
    63  	return nil
    64  }
    65  
    66  var (
    67  	typeInt8     = reflect.TypeOf(int8(0))
    68  	typeUint8    = reflect.TypeOf(uint8(0))
    69  	typeInt16    = reflect.TypeOf(int16(0))
    70  	typeUint16   = reflect.TypeOf(uint16(0))
    71  	typeInt32    = reflect.TypeOf(int32(0))
    72  	typeUint32   = reflect.TypeOf(uint32(0))
    73  	typeInt64    = reflect.TypeOf(int64(0))
    74  	typeUint64   = reflect.TypeOf(uint64(0))
    75  	typeFloat32  = reflect.TypeOf(float32(0))
    76  	typeFloat64  = reflect.TypeOf(float64(0))
    77  	typeRawBytes = reflect.TypeOf(sql.RawBytes{})
    78  	typeTime     = reflect.TypeOf(time.Time{})
    79  	typeUnknown  = reflect.TypeOf(new(interface{}))
    80  )
    81  
    82  // Implements the RowsColumnTypeScanType interface
    83  func (ri *rows) ColumnTypeScanType(index int) reflect.Type {
    84  	field := ri.qr.Fields[index]
    85  	switch field.GetType() {
    86  	case query.Type_INT8:
    87  		return typeInt8
    88  	case query.Type_UINT8:
    89  		return typeUint8
    90  	case query.Type_INT16, query.Type_YEAR:
    91  		return typeInt16
    92  	case query.Type_UINT16:
    93  		return typeUint16
    94  	case query.Type_INT24:
    95  		return typeInt32
    96  	case query.Type_UINT24: // no 24 bit type, using 32 instead
    97  		return typeUint32
    98  	case query.Type_INT32:
    99  		return typeInt32
   100  	case query.Type_UINT32:
   101  		return typeUint32
   102  	case query.Type_INT64:
   103  		return typeInt64
   104  	case query.Type_UINT64:
   105  		return typeUint64
   106  	case query.Type_FLOAT32:
   107  		return typeFloat32
   108  	case query.Type_FLOAT64:
   109  		return typeFloat64
   110  	case query.Type_TIMESTAMP, query.Type_DECIMAL, query.Type_VARCHAR, query.Type_TEXT,
   111  		query.Type_BLOB, query.Type_VARBINARY, query.Type_CHAR, query.Type_BINARY, query.Type_BIT,
   112  		query.Type_ENUM, query.Type_SET, query.Type_TUPLE, query.Type_GEOMETRY, query.Type_JSON,
   113  		query.Type_HEXNUM, query.Type_HEXVAL, query.Type_BITNUM:
   114  
   115  		return typeRawBytes
   116  	case query.Type_DATE, query.Type_TIME, query.Type_DATETIME:
   117  		return typeTime
   118  	default:
   119  		return typeUnknown
   120  	}
   121  }