43 lines
880 B
Go
43 lines
880 B
Go
package db
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import (
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"fmt"
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"strings"
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)
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type QueryBuilder struct {
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sql strings.Builder
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args []any
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}
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/*
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Adds the given SQL and arguments to the query. Any occurrences
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of `$?` will be replaced with the correct argument number.
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foo $? bar $? baz $?
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foo ARG1 bar ARG2 baz $?
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foo ARG1 bar ARG2 baz ARG3
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*/
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func (qb *QueryBuilder) Add(sql string, args ...any) {
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numPlaceholders := strings.Count(sql, "$?")
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if numPlaceholders != len(args) {
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panic(fmt.Errorf("cannot add chunk to query; expected %d arguments but got %d", numPlaceholders, len(args)))
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}
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for _, arg := range args {
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sql = strings.Replace(sql, "$?", fmt.Sprintf("$%d", len(qb.args)+1), 1)
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qb.args = append(qb.args, arg)
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}
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qb.sql.WriteString(sql)
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qb.sql.WriteString("\n")
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}
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func (qb *QueryBuilder) String() string {
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return qb.sql.String()
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}
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func (qb *QueryBuilder) Args() []any {
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return qb.args
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}
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