80 lines
1.4 KiB
Go
80 lines
1.4 KiB
Go
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package types
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import (
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"fmt"
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"strings"
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)
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type colType int
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const (
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integer colType = iota
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boolean
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bigint
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numeric
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bytea
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varchar
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text
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)
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type column struct {
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name string
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typ colType
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}
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type Table struct {
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Name string
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Columns []column
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conflictClause string
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}
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func (tbl *Table) ToCsvRow(args ...interface{}) []string {
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var row []string
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for i, col := range tbl.Columns {
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row = append(row, col.typ.formatter()(args[i]))
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}
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return row
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}
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func (tbl *Table) ToInsertStatement() string {
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var colnames, placeholders []string
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for i, col := range tbl.Columns {
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colnames = append(colnames, col.name)
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placeholders = append(placeholders, fmt.Sprintf("$%d", i+1))
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}
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return fmt.Sprintf(
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"INSERT INTO %s (%s) VALUES (%s) %s",
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tbl.Name, strings.Join(colnames, ", "), strings.Join(placeholders, ", "), tbl.conflictClause,
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)
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}
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type colfmt = func(interface{}) string
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func sprintf(f string) colfmt {
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return func(x interface{}) string { return fmt.Sprintf(f, x) }
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}
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func (typ colType) formatter() colfmt {
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switch typ {
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case integer:
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return sprintf("%d")
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case boolean:
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return func(x interface{}) string {
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if x.(bool) {
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return "t"
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}
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return "f"
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}
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case bigint:
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return sprintf("%s")
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case numeric:
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return sprintf("%d")
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case bytea:
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return sprintf(`\x%x`)
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case varchar:
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return sprintf("%s")
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case text:
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return sprintf("%s")
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}
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panic("unreachable")
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}
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