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update.go
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update.go
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package dbr
import (
"context"
"database/sql"
"strconv"
)
// UpdateStmt builds `UPDATE ...`.
type UpdateStmt struct {
runner
EventReceiver
Dialect
raw
Table string
Value map[string]interface{}
WhereCond []Builder
LimitCount int64
}
type UpdateBuilder = UpdateStmt
func (b *UpdateStmt) Build(d Dialect, buf Buffer) error {
if b.raw.Query != "" {
return b.raw.Build(d, buf)
}
if b.Table == "" {
return ErrTableNotSpecified
}
if len(b.Value) == 0 {
return ErrColumnNotSpecified
}
buf.WriteString("UPDATE ")
buf.WriteString(d.QuoteIdent(b.Table))
buf.WriteString(" SET ")
i := 0
for col, v := range b.Value {
if i > 0 {
buf.WriteString(", ")
}
buf.WriteString(d.QuoteIdent(col))
buf.WriteString(" = ")
buf.WriteString(placeholder)
buf.WriteValue(v)
i++
}
if len(b.WhereCond) > 0 {
buf.WriteString(" WHERE ")
err := And(b.WhereCond...).Build(d, buf)
if err != nil {
return err
}
}
if b.LimitCount >= 0 {
buf.WriteString(" LIMIT ")
buf.WriteString(strconv.FormatInt(b.LimitCount, 10))
}
return nil
}
// Update creates an UpdateStmt.
func Update(table string) *UpdateStmt {
return &UpdateStmt{
Table: table,
Value: make(map[string]interface{}),
LimitCount: -1,
}
}
// Update creates an UpdateStmt.
func (sess *Session) Update(table string) *UpdateStmt {
b := Update(table)
b.runner = sess
b.EventReceiver = sess.EventReceiver
b.Dialect = sess.Dialect
return b
}
// Update creates an UpdateStmt.
func (tx *Tx) Update(table string) *UpdateStmt {
b := Update(table)
b.runner = tx
b.EventReceiver = tx.EventReceiver
b.Dialect = tx.Dialect
return b
}
// UpdateBySql creates an UpdateStmt with raw query.
func UpdateBySql(query string, value ...interface{}) *UpdateStmt {
return &UpdateStmt{
raw: raw{
Query: query,
Value: value,
},
Value: make(map[string]interface{}),
LimitCount: -1,
}
}
// UpdateBySql creates an UpdateStmt with raw query.
func (sess *Session) UpdateBySql(query string, value ...interface{}) *UpdateStmt {
b := UpdateBySql(query, value...)
b.runner = sess
b.EventReceiver = sess.EventReceiver
b.Dialect = sess.Dialect
return b
}
// UpdateBySql creates an UpdateStmt with raw query.
func (tx *Tx) UpdateBySql(query string, value ...interface{}) *UpdateStmt {
b := UpdateBySql(query, value...)
b.runner = tx
b.EventReceiver = tx.EventReceiver
b.Dialect = tx.Dialect
return b
}
// Where adds a where condition.
// query can be Builder or string. value is used only if query type is string.
func (b *UpdateStmt) Where(query interface{}, value ...interface{}) *UpdateStmt {
switch query := query.(type) {
case string:
b.WhereCond = append(b.WhereCond, Expr(query, value...))
case Builder:
b.WhereCond = append(b.WhereCond, query)
}
return b
}
// Set updates column with value.
func (b *UpdateStmt) Set(column string, value interface{}) *UpdateStmt {
b.Value[column] = value
return b
}
// SetMap specifies a map of (column, value) to update in bulk.
func (b *UpdateStmt) SetMap(m map[string]interface{}) *UpdateStmt {
for col, val := range m {
b.Set(col, val)
}
return b
}
func (b *UpdateStmt) Limit(n uint64) *UpdateStmt {
b.LimitCount = int64(n)
return b
}
func (b *UpdateStmt) Exec() (sql.Result, error) {
return b.ExecContext(context.Background())
}
func (b *UpdateStmt) ExecContext(ctx context.Context) (sql.Result, error) {
return exec(ctx, b.runner, b.EventReceiver, b, b.Dialect)
}