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writefreely/db/index.go

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2019-12-30 19:32:06 +01:00
package db
import (
"fmt"
"strings"
)
type CreateIndexSqlBuilder struct {
Dialect DialectType
Name string
Table string
Unique bool
Columns []string
}
type DropIndexSqlBuilder struct {
Dialect DialectType
Name string
Table string
}
func (b *CreateIndexSqlBuilder) ToSQL() (string, error) {
var str strings.Builder
str.WriteString("CREATE ")
if b.Unique {
str.WriteString("UNIQUE ")
}
str.WriteString("INDEX ")
str.WriteString(b.Name)
str.WriteString(" on ")
str.WriteString(b.Table)
if len(b.Columns) == 0 {
return "", fmt.Errorf("columns provided for this index: %s", b.Name)
}
str.WriteString(" (")
columnCount := len(b.Columns)
for i, thing := range b.Columns {
str.WriteString(thing)
if i < columnCount-1 {
str.WriteString(", ")
}
}
str.WriteString(")")
return str.String(), nil
}
func (b *DropIndexSqlBuilder) ToSQL() (string, error) {
return fmt.Sprintf("DROP INDEX %s on %s", b.Name, b.Table), nil
}