2022-01-23 09:36:24 +02:00
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package chschema
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import (
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2023-03-29 16:13:10 +03:00
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"reflect"
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2022-01-23 09:36:24 +02:00
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"strings"
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"github.com/uptrace/go-clickhouse/ch/internal"
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)
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type QueryAppender interface {
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AppendQuery(fmter Formatter, b []byte) ([]byte, error)
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}
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type ColumnsAppender interface {
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AppendColumns(fmter Formatter, b []byte) ([]byte, error)
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}
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//------------------------------------------------------------------------------
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// Safe represents a safe SQL query.
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type Safe string
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var _ QueryAppender = (*Safe)(nil)
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func (s Safe) AppendQuery(fmter Formatter, b []byte) ([]byte, error) {
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return append(b, s...), nil
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}
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//------------------------------------------------------------------------------
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2023-10-01 14:43:38 +03:00
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// Name represents a SQL identifier, for example, table or column name.
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type Name string
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2023-10-01 14:43:38 +03:00
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var _ QueryAppender = (*Name)(nil)
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2022-01-23 09:36:24 +02:00
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2023-10-01 14:43:38 +03:00
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func (s Name) AppendQuery(fmter Formatter, b []byte) ([]byte, error) {
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return fmter.AppendName(b, string(s)), nil
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}
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func AppendName(b []byte, field string) []byte {
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return appendName(b, internal.Bytes(field))
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}
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func appendName(b, src []byte) []byte {
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const quote = '"'
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b = append(b, quote)
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for _, c := range src {
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if c == quote {
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b = append(b, quote, quote)
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} else {
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b = append(b, c)
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}
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}
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b = append(b, quote)
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return b
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}
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2023-10-01 14:43:38 +03:00
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//------------------------------------------------------------------------------
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// Ident represents a fully qualified SQL name, for example, table or column name.
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type Ident string
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var _ QueryAppender = (*Name)(nil)
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func (s Ident) AppendQuery(fmter Formatter, b []byte) ([]byte, error) {
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return fmter.AppendIdent(b, string(s)), nil
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}
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func AppendIdent(b []byte, field string) []byte {
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return appendIdent(b, internal.Bytes(field))
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}
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func appendIdent(b, src []byte) []byte {
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const quote = '"'
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var quoted bool
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loop:
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for _, c := range src {
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switch c {
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case '*':
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if !quoted {
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b = append(b, '*')
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continue loop
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}
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case '.':
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if quoted {
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b = append(b, quote)
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quoted = false
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}
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b = append(b, '.')
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continue loop
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}
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if !quoted {
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b = append(b, quote)
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quoted = true
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}
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if c == quote {
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b = append(b, quote, quote)
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} else {
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b = append(b, c)
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}
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}
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if quoted {
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b = append(b, quote)
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}
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return b
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}
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//------------------------------------------------------------------------------
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type QueryWithArgs struct {
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Query string
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Args []any
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}
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var _ QueryAppender = (*QueryWithArgs)(nil)
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func SafeQuery(query string, args []any) QueryWithArgs {
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if args == nil {
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args = make([]any, 0)
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} else if len(query) > 0 && strings.IndexByte(query, '?') == -1 {
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internal.Warn.Printf("query %q has %v args, but no placeholders", query, args)
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}
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return QueryWithArgs{
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Query: query,
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Args: args,
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}
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}
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func UnsafeName(ident string) QueryWithArgs {
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return QueryWithArgs{Query: ident}
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}
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func (q QueryWithArgs) IsZero() bool {
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return q.Query == "" && q.Args == nil
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}
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2022-11-03 11:58:19 +02:00
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func (q QueryWithArgs) IsEmpty() bool {
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return q.Query == ""
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}
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func (q QueryWithArgs) AppendQuery(fmter Formatter, b []byte) ([]byte, error) {
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if q.Args == nil {
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return fmter.AppendName(b, q.Query), nil
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}
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return fmter.AppendQuery(b, q.Query, q.Args...), nil
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}
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func (q QueryWithArgs) Value() Safe {
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b, _ := q.AppendQuery(emptyFmter, nil)
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return Safe(b)
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}
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//------------------------------------------------------------------------------
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type QueryWithSep struct {
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QueryWithArgs
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Sep string
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}
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func SafeQueryWithSep(query string, args []any, sep string) QueryWithSep {
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return QueryWithSep{
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QueryWithArgs: SafeQuery(query, args),
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Sep: sep,
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}
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}
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2023-03-29 16:13:10 +03:00
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//------------------------------------------------------------------------------
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type ArrayValue struct {
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v reflect.Value
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}
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func Array(vi interface{}) *ArrayValue {
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return &ArrayValue{
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v: reflect.ValueOf(vi),
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}
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}
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var _ QueryAppender = (*ArrayValue)(nil)
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func (a *ArrayValue) AppendQuery(fmter Formatter, b []byte) ([]byte, error) {
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if !a.v.IsValid() || a.v.Len() == 0 {
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b = append(b, "[]"...)
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return b, nil
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}
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typ := a.v.Type()
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elemType := typ.Elem()
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appendElem := Appender(elemType)
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b = append(b, '[')
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ln := a.v.Len()
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for i := 0; i < ln; i++ {
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if i > 0 {
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b = append(b, ',')
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}
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elem := a.v.Index(i)
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b = appendElem(fmter, b, elem)
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}
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b = append(b, ']')
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return b, nil
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}
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