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database/sql: document Result methods
Fixes #5110 R=golang-dev, r CC=golang-dev https://golang.org/cl/19280046
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@ -1637,7 +1637,16 @@ func (r *Row) Scan(dest ...interface{}) error {
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// A Result summarizes an executed SQL command.
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type Result interface {
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// LastInsertId returns the integer generated by the database
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// in response to a command. Typically this will be from an
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// "auto increment" column when inserting a new row. Not all
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// databases support this feature, and the syntax of such
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// statements varies.
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LastInsertId() (int64, error)
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// RowsAffected returns the number of rows affected by an
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// update, insert, or delete. Not every database or database
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// driver may support this.
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RowsAffected() (int64, error)
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}
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