99 lines
2.5 KiB
Go
99 lines
2.5 KiB
Go
package sqlitex
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import (
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"errors"
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"github.com/go-llsqlite/crawshaw"
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)
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var ErrNoResults = errors.New("sqlite: statement has no results")
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var ErrMultipleResults = errors.New("sqlite: statement has multiple result rows")
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func resultSetup(stmt *sqlite.Stmt) error {
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hasRow, err := stmt.Step()
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if err != nil {
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stmt.Reset()
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return err
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}
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if !hasRow {
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stmt.Reset()
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return ErrNoResults
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}
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return nil
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}
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func resultTeardown(stmt *sqlite.Stmt) error {
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hasRow, err := stmt.Step()
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if err != nil {
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stmt.Reset()
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return err
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}
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if hasRow {
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stmt.Reset()
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return ErrMultipleResults
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}
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return stmt.Reset()
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}
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// ResultInt steps the Stmt once and returns the first column as an int.
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//
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// If there are no rows in the result set, ErrNoResults is returned.
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//
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// If there are multiple rows, ErrMultipleResults is returned with the first
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// result.
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//
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// The Stmt is always Reset, so repeated calls will always return the first
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// result.
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func ResultInt(stmt *sqlite.Stmt) (int, error) {
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res, err := ResultInt64(stmt)
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return int(res), err
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}
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// ResultInt64 steps the Stmt once and returns the first column as an int64.
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//
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// If there are no rows in the result set, ErrNoResults is returned.
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//
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// If there are multiple rows, ErrMultipleResults is returned with the first
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// result.
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//
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// The Stmt is always Reset, so repeated calls will always return the first
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// result.
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func ResultInt64(stmt *sqlite.Stmt) (int64, error) {
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if err := resultSetup(stmt); err != nil {
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return 0, err
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}
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return stmt.ColumnInt64(0), resultTeardown(stmt)
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}
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// ResultText steps the Stmt once and returns the first column as a string.
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//
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// If there are no rows in the result set, ErrNoResults is returned.
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//
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// If there are multiple rows, ErrMultipleResults is returned with the first
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// result.
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//
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// The Stmt is always Reset, so repeated calls will always return the first
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// result.
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func ResultText(stmt *sqlite.Stmt) (string, error) {
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if err := resultSetup(stmt); err != nil {
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return "", err
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}
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return stmt.ColumnText(0), resultTeardown(stmt)
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}
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// ResultFloat steps the Stmt once and returns the first column as a float64.
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//
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// If there are no rows in the result set, ErrNoResults is returned.
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//
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// If there are multiple rows, ErrMultipleResults is returned with the first
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// result.
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//
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// The Stmt is always Reset, so repeated calls will always return the first
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// result.
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func ResultFloat(stmt *sqlite.Stmt) (float64, error) {
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if err := resultSetup(stmt); err != nil {
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return 0, err
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}
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return stmt.ColumnFloat(0), resultTeardown(stmt)
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}
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