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116 lines
1.9 KiB
Markdown
116 lines
1.9 KiB
Markdown
# Updating rows
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```sql
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CREATE TABLE authors (
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id SERIAL PRIMARY KEY,
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bio text NOT NULL
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);
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```
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## Single parameter
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If your query has a single parameter, your Go method will also have a single
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parameter.
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The parameter syntax varies by database engine:
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**PostgreSQL:**
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```sql
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-- name: UpdateAuthorBios :exec
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UPDATE authors SET bio = $1;
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```
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**MySQL and SQLite:**
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```sql
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-- name: UpdateAuthorBios :exec
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UPDATE authors SET bio = ?;
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```
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```go
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package db
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import (
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"context"
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"database/sql"
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)
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type DBTX interface {
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ExecContext(context.Context, string, ...any) (sql.Result, error)
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}
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func New(db DBTX) *Queries {
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return &Queries{db: db}
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}
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type Queries struct {
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db DBTX
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}
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const updateAuthorBios = `-- name: UpdateAuthorBios :exec
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UPDATE authors SET bio = $1
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`
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func (q *Queries) UpdateAuthorBios(ctx context.Context, bio string) error {
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_, err := q.db.ExecContext(ctx, updateAuthorBios, bio)
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return err
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}
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```
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## Multiple parameters
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If your query has more than one parameter, your Go method will accept a
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`Params` struct.
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**PostgreSQL:**
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```sql
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-- name: UpdateAuthor :exec
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UPDATE authors SET bio = $2
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WHERE id = $1;
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```
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**MySQL and SQLite:**
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```sql
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-- name: UpdateAuthor :exec
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UPDATE authors SET bio = ?
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WHERE id = ?;
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```
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Note: For MySQL and SQLite, parameters are bound in the order they appear in the query, regardless of the order in the function signature.
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```go
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package db
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import (
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"context"
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"database/sql"
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)
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type DBTX interface {
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ExecContext(context.Context, string, ...any) (sql.Result, error)
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}
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func New(db DBTX) *Queries {
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return &Queries{db: db}
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}
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type Queries struct {
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db DBTX
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}
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const updateAuthor = `-- name: UpdateAuthor :exec
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UPDATE authors SET bio = $2
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WHERE id = $1
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`
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type UpdateAuthorParams struct {
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ID int32
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Bio string
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}
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func (q *Queries) UpdateAuthor(ctx context.Context, arg UpdateAuthorParams) error {
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_, err := q.db.ExecContext(ctx, updateAuthor, arg.ID, arg.Bio)
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return err
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}
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```
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