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callconverter.go
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callconverter.go
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package driver
import (
"context"
"database/sql"
"database/sql/driver"
"fmt"
)
// Boilerplate to define a minimal sql driver implementation.
// To be used for converting stored procedure output parameters
// including sql.Rows output table parameters to guarantee
// exactly the same conversion behavior as for sql.Query.
var (
_ driver.Driver = (*callDriver)(nil)
_ driver.Connector = (*callConnector)(nil)
_ driver.Conn = (*callConn)(nil)
_ driver.NamedValueChecker = (*callConn)(nil)
_ driver.QueryerContext = (*callConn)(nil)
)
var callConverter = sql.OpenDB(new(callConnector))
type callDriver struct{}
var (
defCallDriver = &callDriver{}
defCallConn = &callConn{}
)
func (d *callDriver) Open(name string) (driver.Conn, error) { return defCallConn, nil }
type callConnector struct{}
func (c *callConnector) Connect(context.Context) (driver.Conn, error) { return defCallConn, nil }
func (c *callConnector) Driver() driver.Driver { return defCallDriver }
type callConn struct{}
func (c *callConn) Prepare(query string) (driver.Stmt, error) { panic("not implemented") }
func (c *callConn) Close() error { return nil }
func (c *callConn) Begin() (driver.Tx, error) { panic("not implemented") }
func (c *callConn) CheckNamedValue(nv *driver.NamedValue) error { return nil }
// QueryContext is used to convert the stored procedure output parameters.
func (c *callConn) QueryContext(ctx context.Context, query string, args []driver.NamedValue) (driver.Rows, error) {
if len(args) != 1 {
return nil, fmt.Errorf("invalid argument length %d - expected 1", len(args))
}
cr, ok := args[0].Value.(*callResult)
if !ok {
return nil, fmt.Errorf("invalid argument type %T", args[0])
}
return cr, nil
}