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row.go
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row.go
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package fixtures
import (
"fmt"
"sort"
"strings"
"time"
)
const (
onInsertNow = "ON_INSERT_NOW()"
onUpdateNow = "ON_UPDATE_NOW()"
postgresDriver = "postgres"
)
// Row represents a single database row
type Row struct {
Table string
PK map[string]interface{}
Fields map[string]interface{}
insertColumnLength int
updateColumnLength int
pkColumns []string
pkValues []interface{}
rawPkValues []interface{}
insertColumns []string
updateColumns []string
insertValues []interface{}
updateValues []interface{}
rawInsertValues []interface{}
rawUpdateValues []interface{}
}
// Init loads internal struct variables
func (row *Row) Init() {
// Initial values
row.insertColumnLength = len(row.PK) + len(row.Fields)
row.updateColumnLength = len(row.PK) + len(row.Fields)
row.pkColumns = make([]string, 0)
row.pkValues = make([]interface{}, 0)
row.insertColumns = make([]string, 0)
row.updateColumns = make([]string, 0)
row.insertValues = make([]interface{}, 0)
row.updateValues = make([]interface{}, 0)
row.rawInsertValues = make([]interface{}, 0)
row.rawUpdateValues = make([]interface{}, 0)
// Get and sort map keys
var i int
pkKeys := make([]string, len(row.PK))
i = 0
for pkKey := range row.PK {
pkKeys[i] = pkKey
i++
}
sort.Strings(pkKeys)
fieldKeys := make([]string, len(row.Fields))
i = 0
for fieldKey := range row.Fields {
fieldKeys[i] = fieldKey
i++
}
sort.Strings(fieldKeys)
// Primary keys
for _, pkKey := range pkKeys {
row.pkColumns = append(row.pkColumns, pkKey)
row.appendValue("pk", row.PK[pkKey])
row.insertColumns = append(row.insertColumns, pkKey)
row.updateColumns = append(row.updateColumns, pkKey)
row.appendValue("insert", row.PK[pkKey])
row.appendValue("update", row.PK[pkKey])
}
// Rest of the fields
for _, fieldKey := range fieldKeys {
sv, ok := row.Fields[fieldKey].(string)
if !ok {
//check if byte array
underlyingType, ok := row.Fields[fieldKey].([]interface {})
if ok {
byteArray := convertToByteArray(underlyingType)
row.insertColumns = append(row.insertColumns, fieldKey)
row.updateColumns = append(row.updateColumns, fieldKey)
row.appendValue("insert", byteArray)
row.appendValue("update", byteArray)
continue
}
}
if ok && sv == onInsertNow {
row.insertColumns = append(row.insertColumns, fieldKey)
row.appendValue("insert", time.Now())
row.updateColumnLength--
continue
}
if ok && sv == onUpdateNow {
row.updateColumns = append(row.updateColumns, fieldKey)
row.appendValue("update", time.Now())
row.insertColumnLength--
continue
}
row.insertColumns = append(row.insertColumns, fieldKey)
row.updateColumns = append(row.updateColumns, fieldKey)
row.appendValue("insert", row.Fields[fieldKey])
row.appendValue("update", row.Fields[fieldKey])
}
}
// GetInsertColumnsLength returns number of columns for INSERT query
func (row *Row) GetInsertColumnsLength() int {
return row.insertColumnLength
}
// GetInsertValuesLength returns number of values for INSERT query
func (row *Row) GetInsertValuesLength() int {
return len(row.insertValues)
}
// GetUpdateColumnsLength returns number of columns for UDPATE query
func (row *Row) GetUpdateColumnsLength() int {
return row.updateColumnLength
}
// GetUpdateValuesLength returns number of values for UDPATE query
func (row *Row) GetUpdateValuesLength() int {
return len(row.updateValues)
}
// GetInsertColumns returns a slice of column names for INSERT query
func (row *Row) GetInsertColumns() []string {
escapedColumns := make([]string, len(row.insertColumns))
for i, insertColumn := range row.insertColumns {
escapedColumns[i] = fmt.Sprintf("\"%s\"", insertColumn)
}
return escapedColumns
}
// GetUpdateColumns returns a slice of column names for UPDATE query
func (row *Row) GetUpdateColumns() []string {
escapedColumns := make([]string, len(row.updateColumns))
for i, updateColumn := range row.updateColumns {
escapedColumns[i] = fmt.Sprintf("\"%s\"", updateColumn)
}
return escapedColumns
}
// GetInsertValues returns a slice of values for INSERT query
func (row *Row) GetInsertValues() []interface{} {
return row.insertValues
}
// GetUpdateValues returns a slice of values for UPDATE query
func (row *Row) GetUpdateValues() []interface{} {
return row.updateValues
}
// GetInsertPlaceholders returns a slice of placeholders for INSERT query
func (row *Row) GetInsertPlaceholders(driver string) []string {
placeholders := make([]string, row.GetInsertColumnsLength())
for i, j := 0, 0; i < row.GetInsertColumnsLength(); i++ {
val := row.rawInsertValues[i]
switch v := val.(type) {
case string:
if strings.HasPrefix(v, "RAW=") {
placeholders[i] = strings.TrimPrefix(v, "RAW=")
continue
}
}
if driver == postgresDriver {
placeholders[i] = fmt.Sprintf("$%d", j+1)
j++
} else {
placeholders[i] = "?"
}
}
return placeholders
}
// GetUpdatePlaceholders returns a slice of placeholders for UPDATE query
func (row *Row) GetUpdatePlaceholders(driver string) []string {
placeholders := make([]string, row.GetUpdateColumnsLength())
j := 0
for i, c := range row.GetUpdateColumns() {
val := row.rawUpdateValues[i]
switch v := val.(type) {
case string:
if strings.HasPrefix(v, "RAW=") {
placeholders[i] = fmt.Sprintf("%s = %s", c, strings.TrimPrefix(v, "RAW="))
continue
}
}
if driver == postgresDriver {
placeholders[i] = fmt.Sprintf("%s = $%d", c, j+1)
j++
} else {
placeholders[i] = fmt.Sprintf("%s = ?", c)
}
}
return placeholders
}
// GetWhere returns a where condition based on primary key with placeholders
func (row *Row) GetWhere(driver string, i int) string {
wheres := make([]string, len(row.PK))
start, j := i, i
for _, c := range row.pkColumns {
val := row.rawPkValues[i-start]
i++
switch v := val.(type) {
case string:
if strings.HasPrefix(v, "RAW=") {
wheres[i-1-start] = fmt.Sprintf("%s = %s", c, strings.TrimPrefix(v, "RAW="))
continue
}
}
if driver == postgresDriver {
wheres[i-1-start] = fmt.Sprintf("%s = $%d", c, j+1)
j++
} else {
wheres[i-1-start] = fmt.Sprintf("%s = ?", c)
}
}
return strings.Join(wheres, " AND ")
}
// GetPKValues returns a slice of primary key values
func (row *Row) GetPKValues() []interface{} {
return row.pkValues
}
func (row *Row) appendValue(queryType string, val interface{}) {
sv, ok := val.(string)
if !ok || !strings.HasPrefix(sv, "RAW=") {
switch queryType {
case "insert":
row.insertValues = append(row.insertValues, val)
case "update":
row.updateValues = append(row.updateValues, val)
case "pk":
row.pkValues = append(row.pkValues, val)
}
}
switch queryType {
case "insert":
row.rawInsertValues = append(row.rawInsertValues, val)
case "update":
row.rawUpdateValues = append(row.rawUpdateValues, val)
case "pk":
row.rawPkValues = append(row.rawPkValues, val)
}
}
func convertToByteArray(original []interface {}) []byte{
array := make([]byte, len(original))
for i, v := range original {
array[i] = byte(v.(int))
}
return array
}