82 lines
1.4 KiB
Go
82 lines
1.4 KiB
Go
package qb
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import (
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"bytes"
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"fmt"
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"strings"
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"time"
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)
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type expr interface {
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// WriteCql writes a CQL representation of the expr to a buffer and returns
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// slice of parameter names.
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WriteCql(cql *bytes.Buffer) (names []string)
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}
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type columns []string
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func (cols columns) writeCql(cql *bytes.Buffer) (names []string) {
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for i, c := range cols {
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cql.WriteString(c)
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if i < len(cols)-1 {
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cql.WriteByte(',')
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}
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}
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return
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}
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type using struct {
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timestamp time.Time
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ttl time.Duration
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}
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func (u using) writeCql(cql *bytes.Buffer) (names []string) {
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var v []string
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if !u.timestamp.IsZero() {
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v = append(v, fmt.Sprint("TIMESTAMP ", u.timestamp.UnixNano()/1000))
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}
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if u.ttl != 0 {
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v = append(v, fmt.Sprint("TTL ", int(u.ttl.Seconds())))
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}
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if len(v) > 0 {
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cql.WriteString("USING ")
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cql.WriteString(strings.Join(v, ","))
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cql.WriteByte(' ')
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}
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return
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}
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type where []expr
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func (w where) writeCql(cql *bytes.Buffer) (names []string) {
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if len(w) == 0 {
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return
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}
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cql.WriteString("WHERE ")
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return writeCql(w, cql)
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}
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type _if []expr
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func (w _if) writeCql(cql *bytes.Buffer) (names []string) {
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if len(w) == 0 {
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return
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}
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cql.WriteString("IF ")
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return writeCql(w, cql)
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}
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func writeCql(es []expr, cql *bytes.Buffer) (names []string) {
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for i, c := range es {
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names = append(names, c.WriteCql(cql)...)
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if i < len(es)-1 {
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cql.WriteString(" AND ")
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}
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}
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cql.WriteByte(' ')
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return
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}
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