94 lines
1.8 KiB
Go
94 lines
1.8 KiB
Go
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package qb
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// DELETE reference:
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// http://docs.datastax.com/en/dse/5.1/cql/cql/cql_reference/cql_commands/cqlDelete.html
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import (
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"bytes"
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"errors"
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"fmt"
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"time"
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)
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type DeleteBuilder struct {
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table string
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columns columns
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using using
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where where
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_if _if
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exists bool
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}
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// Delete returns a new DeleteBuilder with the given table name.
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func Delete(table string) *DeleteBuilder {
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return &DeleteBuilder{
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table: table,
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}
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}
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func (b *DeleteBuilder) ToCql() (stmt string, names []string, err error) {
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if b.table == "" {
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err = errors.New("delete statements must specify a table")
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return
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}
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if len(b.where) == 0 {
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err = fmt.Errorf("delete statements must have at least one WHERE clause")
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return
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}
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cql := bytes.Buffer{}
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cql.WriteString("DELETE ")
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if len(b.columns) > 0 {
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b.columns.writeCql(&cql)
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cql.WriteByte(' ')
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}
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cql.WriteString("FROM ")
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cql.WriteString(b.table)
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cql.WriteByte(' ')
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b.using.writeCql(&cql)
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names = append(names, b.where.writeCql(&cql)...)
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names = append(names, b._if.writeCql(&cql)...)
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if b.exists {
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cql.WriteString("IF EXISTS ")
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}
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stmt = cql.String()
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return
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}
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// From sets the table to be deleted from.
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func (b *DeleteBuilder) From(table string) *DeleteBuilder {
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b.table = table
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return b
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}
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// Columns adds delete columns to the query.
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func (b *DeleteBuilder) Columns(columns ...string) *DeleteBuilder {
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b.columns = append(b.columns, columns...)
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return b
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}
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func (b *DeleteBuilder) Timestamp(t time.Time) *DeleteBuilder {
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b.using.timestamp = t
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return b
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}
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func (b *DeleteBuilder) Where(e ...expr) *DeleteBuilder {
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b.where = append(b.where, e...)
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return b
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}
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func (b *DeleteBuilder) If(e ...expr) *DeleteBuilder {
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b._if = append(b._if, e...)
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return b
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}
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func (b *DeleteBuilder) Existing() *DeleteBuilder {
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b.exists = true
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return b
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}
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