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gen_helpers.go
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gen_helpers.go
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// DO NOT MODIFY! AUTO GENERATED BY igo v1.0.2 (https://github.com/rocketlaunchr/igo)
// Copyright 2019-20 PJ Engineering and Business Solutions Pty. Ltd. All rights reserved.
package dbq
import (
"context"
"errors"
"fmt"
"reflect"
"strconv"
"strings"
"time"
"cloud.google.com/go/civil"
"github.com/cenkalti/backoff/v4"
// "gopkg.in/cenkalti/backoff.v4"
)
// Database is used to set the Database.
// Different databases have different syntax for placeholders etc.
type Database int
const (
// MySQL database
MySQL Database = 0
// PostgreSQL database
PostgreSQL Database = 1
)
// INSERTStmt will generate an INSERT statement. It can be used for bulk inserts.
//
// NOTE: You may have to escape the column names. For MySQL, use backticks.
func INSERTStmt(tableName string, columns []string, rows int, dbtype ...Database) string {
return fmt.Sprintf("INSERT INTO %s ( %s ) VALUES %s", tableName, strings.Join(columns, ","), Ph(len(columns), rows, 0, dbtype...))
}
// INSERT is the legacy equivalent of INSERTStmt.
//
// Deprecated: It will be removed in v3. Use INSERTStmt instead.
func INSERT(tableName string, columns []string, rows int, dbtype ...Database) string {
return INSERTStmt(tableName, columns, rows, dbtype...)
}
// Ph generates the placeholders for SQL queries.
// For a bulk insert operation, rows is the number of rows you intend
// to insert, and columnsN is the number of fields per row.
// For the IN function, set rows to 1.
// For PostgreSQL, you can use incr to increment the placeholder starting count.
//
// NOTE: The function panics if either columnsN or rows is 0.
//
// Example:
//
// dbq.Ph(3, 1, 0)
// // Output: ( ?,?,? )
//
// dbq.Ph(3, 2, 0)
// // Output: ( ?,?,? ),( ?,?,? )
//
func Ph(columnsN, rows int, incr int, dbtype ...Database) string {
var typ Database
if len(dbtype) > 0 {
typ = dbtype[0]
}
if columnsN == 0 {
panic(errors.New("columnsN must not be 0"))
}
if rows == 0 {
panic(errors.New("rows must not be 0"))
}
if typ == MySQL {
inner := "( " + strings.TrimSuffix(strings.Repeat("?,", columnsN), ",") + " ),"
return strings.TrimSuffix(strings.Repeat(inner, rows), ",")
}
var singleValuesStr string
varCount := 1 + incr
for i := 1; i <= rows; i++ {
singleValuesStr = singleValuesStr + "("
for j := 1; j <= columnsN; j++ {
singleValuesStr = singleValuesStr + fmt.Sprintf("$%d,", varCount)
varCount++
}
singleValuesStr = strings.TrimSuffix(singleValuesStr, ",") + "),"
}
return strings.TrimSuffix(singleValuesStr, ",")
}
func sliceConv(arg reflect.Value) []interface{} {
out := []interface{}{}
if arg.Kind() == reflect.Slice {
for i := 0; i < arg.Len(); i++ {
out = append(out, sliceConv(reflect.ValueOf(arg.Index(i).Interface()))...)
}
} else {
out = append(out, arg.Interface())
}
return out
}
// ExponentialRetryPolicy is a retry policy with exponentially increasing intervals between
// each retry attempt. If maxElapsedTime is 0, it will retry forever unless restricted by retryAttempts.
//
// See: https://godoc.org/gopkg.in/cenkalti/backoff.v4#ExponentialBackOff
func ExponentialRetryPolicy(maxElapsedTime time.Duration, retryAttempts ...uint64) backoff.BackOff {
bo := backoff.NewExponentialBackOff()
bo.MaxElapsedTime = maxElapsedTime
if len(retryAttempts) > 0 && retryAttempts[0] != 0 {
return backoff.WithMaxRetries(bo, retryAttempts[0])
}
return bo
}
// ConstantDelayRetryPolicy is a retry policy with constant intervals between
// each retry attempt. It will retry forever unless restricted by retryAttempts.
//
// See: https://godoc.org/gopkg.in/cenkalti/backoff.v4#ConstantBackOff
func ConstantDelayRetryPolicy(interval time.Duration, retryAttempts ...uint64) backoff.BackOff {
bo := backoff.NewConstantBackOff(interval)
if len(retryAttempts) > 0 && retryAttempts[0] != 0 {
return backoff.WithMaxRetries(bo, retryAttempts[0])
}
return bo
}
// StdTimeConversionConfig provides a standard configuration for unmarshaling to
// time-related fields in a struct. It properly converts timestamps and datetime columns into
// time.Time objects. It assumes a MySQL database as default.
func StdTimeConversionConfig(dbtype ...Database) *StructorConfig {
layouts := []string{
"2006-01-02 15:04:05",
time.RFC3339,
}
if len(dbtype) > 0 && dbtype[0] == PostgreSQL {
layouts[0], layouts[1] = layouts[1], layouts[0]
}
return &StructorConfig{
WeaklyTypedInput: true,
DecodeHook: func(f reflect.Type, t reflect.Type, data interface{}) (interface{}, error) {
if f.Kind() != reflect.String {
return data, nil
}
switch t {
case reflect.TypeOf(civil.Date{}):
return civil.ParseDate(data.(string))
case reflect.TypeOf(civil.DateTime{}):
t, err := time.Parse(layouts[0], data.(string))
if err != nil {
t, err = time.Parse(layouts[1], data.(string))
if err != nil {
return nil, err
}
}
return civil.DateTime{
Date: civil.DateOf(t),
Time: civil.TimeOf(t),
}, nil
case reflect.TypeOf(civil.Time{}):
return civil.ParseTime(data.(string))
case reflect.TypeOf(time.Time{}):
t, err := time.Parse(layouts[0], data.(string))
if err != nil {
t, err := time.Parse(layouts[1], data.(string))
if err != nil {
return nil, err
}
return t, nil
}
return t, nil
default:
return data, nil
}
return data, nil
},
}
}
// Struct converts the fields of the struct into a slice of values.
// You can use it to convert a struct into the placeholder arguments required by
// the Q and E function. tagName is used to indicate the struct tag (default is "dbq").
// The function panics if strct is not an actual struct.
func Struct(strct interface{}, tagName ...string) []interface{} {
tg := "dbq"
if len(tagName) > 0 {
tg = tagName[0]
}
out := []interface{}{}
if strct == nil {
panic(errors.New("strct must be a struct"))
}
s := reflect.ValueOf(strct)
if s.Kind() == reflect.Ptr {
s = reflect.Indirect(s)
}
typeOfT := s.Type()
for i := 0; i < s.NumField(); i++ {
f := typeOfT.Field(i)
if f.PkgPath != "" {
continue
}
fieldTag := f.Tag.Get(tg)
fieldValRaw := s.Field(i)
fieldVal := fieldValRaw.Interface()
if fieldValRaw.Kind() == reflect.Map {
continue
}
if fieldTag == "-" || (strings.HasSuffix(fieldTag, ",omitempty") && reflect.DeepEqual(fieldVal, reflect.Zero(reflect.TypeOf(fieldVal)).Interface())) {
continue
}
if fieldValRaw.Kind() == reflect.Slice {
out = append(out, sliceConv(fieldValRaw)...)
continue
}
out = append(out, fieldVal)
}
return out
}
// Qs operates the same as Q except it requires you to provide a ConcreteStruct as an argument.
// This allows you to recycle common options and conveniently provide a different ConcreteStruct.
func Qs(ctx context.Context, db interface{}, query string, ConcreteStruct interface{}, options *Options, args ...interface{}) (out interface{}, rErr error) {
if ConcreteStruct == nil {
panic("ConcreteStruct required")
}
var o Options
if options == nil {
o.ConcreteStruct = ConcreteStruct
} else {
o = *options
o.ConcreteStruct = ConcreteStruct
}
return Q(ctx, db, query, &o, args...)
}
// MustQs is a wrapper around the Qs function. It will panic upon encountering an error.
// This can erradicate boiler-plate error handing code.
func MustQs(ctx context.Context, db interface{}, query string, ConcreteStruct interface{}, options *Options, args ...interface{}) interface{} {
UOpEdK, updOMe := Qs(ctx, db, query, ConcreteStruct, options, args...)
if updOMe != nil {
panic(updOMe)
}
return UOpEdK
}
func parseUintP(s string) *uint {
n, _ := strconv.ParseUint(s, 10, 0)
return &[]uint{uint(n)}[0]
}
func parseUint8P(s string) *uint8 {
n, _ := strconv.ParseUint(s, 10, 8)
return &[]uint8{uint8(n)}[0]
}
func parseUint16P(s string) *uint16 {
n, _ := strconv.ParseUint(s, 10, 16)
return &[]uint16{uint16(n)}[0]
}
func parseUint32P(s string) *uint32 {
n, _ := strconv.ParseUint(s, 10, 32)
return &[]uint32{uint32(n)}[0]
}
func parseUint64P(s string) *uint64 {
n, _ := strconv.ParseUint(s, 10, 64)
return &[]uint64{uint64(n)}[0]
}
func parseIntP(s string) *int {
n, _ := strconv.ParseInt(s, 10, 0)
return &[]int{int(n)}[0]
}
func parseInt8P(s string) *int8 {
n, _ := strconv.ParseInt(s, 10, 8)
return &[]int8{int8(n)}[0]
}
func parseInt16P(s string) *int16 {
n, _ := strconv.ParseInt(s, 10, 16)
return &[]int16{int16(n)}[0]
}
func parseInt32P(s string) *int32 {
n, _ := strconv.ParseInt(s, 10, 32)
return &[]int32{int32(n)}[0]
}
func parseInt64P(s string) *int64 {
n, _ := strconv.ParseInt(s, 10, 64)
return &[]int64{int64(n)}[0]
}
func parseUint(s string) uint {
n, _ := strconv.ParseUint(s, 10, 0)
return uint(n)
}
func parseUint8(s string) uint8 {
n, _ := strconv.ParseUint(s, 10, 8)
return uint8(n)
}
func parseUint16(s string) uint16 {
n, _ := strconv.ParseUint(s, 10, 16)
return uint16(n)
}
func parseUint32(s string) uint32 {
n, _ := strconv.ParseUint(s, 10, 32)
return uint32(n)
}
func parseUint64(s string) uint64 {
n, _ := strconv.ParseUint(s, 10, 64)
return n
}
func parseInt(s string) int {
n, _ := strconv.ParseInt(s, 10, 0)
return int(n)
}
func parseInt8(s string) int8 {
n, _ := strconv.ParseInt(s, 10, 8)
return int8(n)
}
func parseInt16(s string) int16 {
n, _ := strconv.ParseInt(s, 10, 16)
return int16(n)
}
func parseInt32(s string) int32 {
n, _ := strconv.ParseInt(s, 10, 32)
return int32(n)
}
func parseInt64(s string) int64 {
n, _ := strconv.ParseInt(s, 10, 64)
return n
}