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postgres.go
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postgres.go
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package sql
import (
"database/sql"
"fmt"
"time"
"github.com/influxdata/flux"
"github.com/influxdata/flux/codes"
"github.com/influxdata/flux/execute"
"github.com/influxdata/flux/internal/errors"
"github.com/influxdata/flux/values"
)
type PostgresRowReader struct {
Cursor *sql.Rows
columns []interface{}
columnTypes []flux.ColType
columnNames []string
}
func (m *PostgresRowReader) Next() bool {
next := m.Cursor.Next()
if next {
columnNames, err := m.Cursor.Columns()
if err != nil {
return false
}
m.columns = make([]interface{}, len(columnNames))
columnPointers := make([]interface{}, len(columnNames))
for i := 0; i < len(columnNames); i++ {
columnPointers[i] = &m.columns[i]
}
if err := m.Cursor.Scan(columnPointers...); err != nil {
return false
}
}
return next
}
func (m *PostgresRowReader) GetNextRow() ([]values.Value, error) {
row := make([]values.Value, len(m.columns))
for i, col := range m.columns {
switch col := col.(type) {
case bool, int64, uint64, float64, string:
row[i] = values.New(col)
case time.Time:
row[i] = values.NewTime(values.ConvertTime(col))
case []uint8:
// Hack for MySQL, might need to work with charset?
// Can't do boolean with MySQL - stores BOOLEANs as TINYINTs (0 or 1)
// No way to distinguish if intended int or bool
switch m.columnTypes[i] {
case flux.TInt:
newInt, err := UInt8ToInt64(col)
if err != nil {
return nil, err
}
row[i] = values.NewInt(newInt)
case flux.TFloat:
newFloat, err := UInt8ToFloat(col)
if err != nil {
return nil, err
}
row[i] = values.NewFloat(newFloat)
// This works, but you can also just just add the DSN parameter parseTime=true (see line 136)
case flux.TTime:
t, err := time.Parse(layout, string(col))
if err != nil {
fmt.Print(err)
}
row[i] = values.NewTime(values.ConvertTime(t))
default:
row[i] = values.NewString(string(col))
}
case nil:
row[i] = values.NewNull(flux.SemanticType(m.columnTypes[i]))
default:
execute.PanicUnknownType(flux.TInvalid)
}
}
return row, nil
}
func (m *PostgresRowReader) InitColumnNames(n []string) {
m.columnNames = n
}
func (m *PostgresRowReader) InitColumnTypes(types []*sql.ColumnType) {
stringTypes := make([]flux.ColType, len(types))
for i := 0; i < len(types); i++ {
switch types[i].DatabaseTypeName() {
case "INT", "BIGINT", "SMALLINT", "TINYINT", "INT2", "INT4", "INT8", "SERIAL2", "SERIAL4", "SERIAL8":
stringTypes[i] = flux.TInt
case "FLOAT4", "FLOAT8":
stringTypes[i] = flux.TFloat
case "DATE", "TIME", "TIMESTAMP":
stringTypes[i] = flux.TTime
case "BOOL":
stringTypes[i] = flux.TBool
case "TEXT":
stringTypes[i] = flux.TString
default:
stringTypes[i] = flux.TString
}
}
m.columnTypes = stringTypes
}
func (m *PostgresRowReader) ColumnNames() []string {
return m.columnNames
}
func (m *PostgresRowReader) ColumnTypes() []flux.ColType {
return m.columnTypes
}
func (m *PostgresRowReader) SetColumns(i []interface{}) {
m.columns = i
}
func (m *PostgresRowReader) Close() error {
if err := m.Cursor.Err(); err != nil {
return err
}
return m.Cursor.Close()
}
func NewPostgresRowReader(r *sql.Rows) (execute.RowReader, error) {
reader := &PostgresRowReader{
Cursor: r,
}
cols, err := r.Columns()
if err != nil {
return nil, err
}
reader.InitColumnNames(cols)
types, err := r.ColumnTypes()
if err != nil {
return nil, err
}
reader.InitColumnTypes(types)
return reader, nil
}
// PostgresTranslateColumn translates flux colTypes into their corresponding postgres column type
func PostgresColumnTranslateFunc() translationFunc {
c := map[string]string{
flux.TFloat.String(): "FLOAT",
flux.TInt.String(): "BIGINT",
flux.TUInt.String(): "BIGINT",
flux.TString.String(): "TEXT",
flux.TTime.String(): "TIMESTAMP",
flux.TBool.String(): "BOOL",
}
return func(f flux.ColType, colName string) (string, error) {
s, found := c[f.String()]
if !found {
return "", errors.Newf(codes.Internal, "PostgreSQL does not support column type %s", f.String())
}
return colName + " " + s, nil
}
}