proxy

type Conn struct {
	Conn  driver.Conn
	Proxy *Proxy
}

type Connector struct {
	Proxy     *Proxy
	Connector driver.Connector
	Name      string
}

type Filter interface {
	DoOutput(packageName string) bool
}

type Hooks struct {
	// PrePing is a callback that gets called prior to calling
	// `Conn.Ping`, and is ALWAYS called. If this callback returns an
	// error, the underlying driver's `Conn.Ping` and `Hooks.Ping` methods
	// are not called.
	//
	// The first return value is passed to both `Hooks.Ping` and
	// `Hooks.PostPing` callbacks. You may specify anything you want.
	// Return nil if you do not need to use it.
	//
	// The second return value is indicates the error found while
	// executing this hook. If this callback returns an error,
	// the underlying driver's `Conn.Ping` method and `Hooks.Ping`
	// methods are not called.
	PrePing func(conn *Conn) (interface{}, error)

	// Ping is called after the underlying driver's `Conn.Exec` method
	// returns without any errors.
	//
	// The `ctx` parameter is the return value supplied from the
	// `Hooks.PrePing` method, and may be nil.
	//
	// If this callback returns an error, then the error from this
	// callback is returned by the `Conn.Ping` method.
	Ping func(ctx interface{}, conn *Conn) error

	// PostPing is a callback that gets called at the end of
	// the call to `Conn.Ping`. It is ALWAYS called.
	//
	// The `ctx` parameter is the return value supplied from the
	// `Hooks.PrePing` method, and may be nil.
	PostPing func(ctx interface{}, conn *Conn, err error) error

	// PreOpen is a callback that gets called before any
	// attempt to open the sql connection is made, and is ALWAYS
	// called.
	//
	// The first return value is passed to both `Hooks.Open` and
	// `Hooks.PostOpen` callbacks. You may specify anything you want.
	// Return nil if you do not need to use it.
	//
	// The second return value is indicates the error found while
	// executing this hook. If this callback returns an error,
	// the underlying driver's `Driver.Open` method and `Hooks.Open`
	// methods are not called.
	PreOpen func(name string) (interface{}, error)

	// Open is called after the underlying driver's `Driver.Open` method
	// returns without any errors.
	//
	// The `ctx` parameter is the return value supplied from the
	// `Hooks.PreOpen` method, and may be nil.
	//
	// If this callback returns an error, then the `conn` object is
	// closed by calling the `Close` method, and the error from this
	// callback is returned by the `db.Open` method.
	Open func(ctx interface{}, conn *Conn) error

	// PostOpen is a callback that gets called at the end of
	// the call to `db.Open(). It is ALWAYS called.
	//
	// The `ctx` parameter is the return value supplied from the
	// `Hooks.PreOpen` method, and may be nil.
	PostOpen func(ctx interface{}, conn *Conn) error

	// PreExec is a callback that gets called prior to calling
	// `Stmt.Exec`, and is ALWAYS called. If this callback returns an
	// error, the underlying driver's `Stmt.Exec` and `Hooks.Exec` methods
	// are not called.
	//
	// The first return value is passed to both `Hooks.Exec` and
	// `Hooks.PostExec` callbacks. You may specify anything you want.
	// Return nil if you do not need to use it.
	//
	// The second return value is indicates the error found while
	// executing this hook. If this callback returns an error,
	// the underlying driver's `Driver.Exec` method and `Hooks.Exec`
	// methods are not called.
	PreExec func(stmt *Stmt, args []driver.Value) (interface{}, error)

	// Exec is called after the underlying driver's `Driver.Exec` method
	// returns without any errors.
	//
	// The `ctx` parameter is the return value supplied from the
	// `Hooks.PreExec` method, and may be nil.
	//
	// If this callback returns an error, then the error from this
	// callback is returned by the `Stmt.Exec` method.
	Exec func(ctx interface{}, stmt *Stmt, args []driver.Value, result driver.Result) error

	// PostExec is a callback that gets called at the end of
	// the call to `Stmt.Exec`. It is ALWAYS called.
	//
	// The `ctx` parameter is the return value supplied from the
	// `Hooks.PreExec` method, and may be nil.
	PostExec func(ctx interface{}, stmt *Stmt, args []driver.Value, result driver.Result) error

	// PreQuery is a callback that gets called prior to calling
	// `Stmt.Query`, and is ALWAYS called. If this callback returns an
	// error, the underlying driver's `Stmt.Query` and `Hooks.Query` methods
	// are not called.
	//
	// The first return value is passed to both `Hooks.Query` and
	// `Hooks.PostQuery` callbacks. You may specify anything you want.
	// Return nil if you do not need to use it.
	//
	// The second return value is indicates the error found while
	// executing this hook. If this callback returns an error,
	// the underlying driver's `Stmt.Query` method and `Hooks.Query`
	// methods are not called.
	PreQuery func(stmt *Stmt, args []driver.Value) (interface{}, error)

	// Query is called after the underlying driver's `Stmt.Query` method
	// returns without any errors.
	//
	// The `ctx` parameter is the return value supplied from the
	// `Hooks.PreQuery` method, and may be nil.
	//
	// If this callback returns an error, then the error from this
	// callback is returned by the `Stmt.Query` method.
	Query func(ctx interface{}, stmt *Stmt, args []driver.Value, rows driver.Rows) error

	// PostQuery is a callback that gets called at the end of
	// the call to `Stmt.Query`. It is ALWAYS called.
	//
	// The `ctx` parameter is the return value supplied from the
	// `Hooks.PreQuery` method, and may be nil.
	PostQuery func(ctx interface{}, stmt *Stmt, args []driver.Value, rows driver.Rows) error

	// PreBegin is a callback that gets called prior to calling
	// `Stmt.Begin`, and is ALWAYS called. If this callback returns an
	// error, the underlying driver's `Conn.Begin` and `Hooks.Begin` methods
	// are not called.
	//
	// The first return value is passed to both `Hooks.Begin` and
	// `Hooks.PostBegin` callbacks. You may specify anything you want.
	// Return nil if you do not need to use it.
	//
	// The second return value is indicates the error found while
	// executing this hook. If this callback returns an error,
	// the underlying driver's `Conn.Begin` method and `Hooks.Begin`
	// methods are not called.
	PreBegin func(conn *Conn) (interface{}, error)

	// Begin is called after the underlying driver's `Conn.Begin` method
	// returns without any errors.
	//
	// The `ctx` parameter is the return value supplied from the
	// `Hooks.PreBegin` method, and may be nil.
	//
	// If this callback returns an error, then the error from this
	// callback is returned by the `Conn.Begin` method.
	Begin func(ctx interface{}, conn *Conn) error

	// PostBegin is a callback that gets called at the end of
	// the call to `Conn.Begin`. It is ALWAYS called.
	//
	// The `ctx` parameter is the return value supplied from the
	// `Hooks.PreBegin` method, and may be nil.
	PostBegin func(ctx interface{}, conn *Conn) error

	// PreCommit is a callback that gets called prior to calling
	// `Tx.Commit`, and is ALWAYS called. If this callback returns an
	// error, the underlying driver's `Tx.Commit` and `Hooks.Commit` methods
	// are not called.
	//
	// The first return value is passed to both `Hooks.Commit` and
	// `Hooks.PostCommit` callbacks. You may specify anything you want.
	// Return nil if you do not need to use it.
	//
	// The second return value is indicates the error found while
	// executing this hook. If this callback returns an error,
	// the underlying driver's `Tx.Commit` method and `Hooks.Commit`
	// methods are not called.
	PreCommit func(tx *Tx) (interface{}, error)

	// Commit is called after the underlying driver's `Tx.Commit` method
	// returns without any errors.
	//
	// The `ctx` parameter is the return value supplied from the
	// `Hooks.PreCommit` method, and may be nil.
	//
	// If this callback returns an error, then the error from this
	// callback is returned by the `Tx.Commit` method.
	Commit func(ctx interface{}, tx *Tx) error

	// PostCommit is a callback that gets called at the end of
	// the call to `Tx.Commit`. It is ALWAYS called.
	//
	// The `ctx` parameter is the return value supplied from the
	// `Hooks.PreCommit` method, and may be nil.
	PostCommit func(ctx interface{}, tx *Tx) error

	// PreRollback is a callback that gets called prior to calling
	// `Tx.Rollback`, and is ALWAYS called. If this callback returns an
	// error, the underlying driver's `Tx.Rollback` and `Hooks.Rollback` methods
	// are not called.
	//
	// The first return value is passed to both `Hooks.Rollback` and
	// `Hooks.PostRollback` callbacks. You may specify anything you want.
	// Return nil if you do not need to use it.
	//
	// The second return value is indicates the error found while
	// executing this hook. If this callback returns an error,
	// the underlying driver's `Tx.Rollback` method and `Hooks.Rollback`
	PreRollback func(tx *Tx) (interface{}, error)

	// Rollback is called after the underlying driver's `Tx.Rollback` method
	// returns without any errors.
	//
	// The `ctx` parameter is the return value supplied from the
	// `Hooks.PreRollback` method, and may be nil.
	//
	// If this callback returns an error, then the error from this
	// callback is returned by the `Tx.Rollback` method.
	Rollback func(ctx interface{}, tx *Tx) error

	// PostRollback is a callback that gets called at the end of
	// the call to `Tx.Rollback`. It is ALWAYS called.
	//
	// The `ctx` parameter is the return value supplied from the
	// `Hooks.PreRollback` method, and may be nil.
	PostRollback func(ctx interface{}, tx *Tx) error

	// PreClose is a callback that gets called prior to calling
	// `Conn.Close`, and is ALWAYS called. If this callback returns an
	// error, the underlying driver's `Conn.Close` and `Hooks.Close` methods
	// are not called.
	//
	// The first return value is passed to both `Hooks.Close` and
	// `Hooks.PostClose` callbacks. You may specify anything you want.
	// Return nil if you do not need to use it.
	//
	// The second return value is indicates the error found while
	// executing this hook. If this callback returns an error,
	// the underlying driver's `Conn.Close` method and `Hooks.Close`
	// methods are not called.
	PreClose func(conn *Conn) (interface{}, error)

	// Close is called after the underlying driver's `Conn.Close` method
	// returns without any errors.
	//
	// The `ctx` parameter is the return value supplied from the
	// `Hooks.PreClose` method, and may be nil.
	//
	// If this callback returns an error, then the error from this
	// callback is returned by the `Conn.Close` method.
	Close func(ctx interface{}, conn *Conn) error

	// PostClose is a callback that gets called at the end of
	// the call to `Conn.Close`. It is ALWAYS called.
	//
	// The `ctx` parameter is the return value supplied from the
	// `Hooks.PreClose` method, and may be nil.
	PostClose func(ctx interface{}, conn *Conn, err error) error

	// PreResetSession is a callback that gets called prior to calling
	// `Conn.ResetSession`, and is ALWAYS called. If this callback returns an
	// error, the underlying driver's `Conn.ResetSession` and `Hooks.ResetSession` methods
	// are not called.
	//
	// The first return value is passed to both `Hooks.ResetSession` and
	// `Hooks.PostResetSession` callbacks. You may specify anything you want.
	// Return nil if you do not need to use it.
	//
	// The second return value is indicates the error found while
	// executing this hook. If this callback returns an error,
	// the underlying driver's `Conn.ResetSession` method and `Hooks.ResetSession`
	// methods are not called.
	PreResetSession func(conn *Conn) (interface{}, error)

	// ResetSession is called after the underlying driver's `Conn.ResetSession` method
	// returns without any errors.
	//
	// The `ctx` parameter is the return value supplied from the
	// `Hooks.PreResetSession` method, and may be nil.
	//
	// If this callback returns an error, then the error from this
	// callback is returned by the `Conn.ResetSession` method.
	ResetSession func(ctx interface{}, conn *Conn) error

	// PostResetSession is a callback that gets called at the end of
	// the call to `Conn.ResetSession`. It is ALWAYS called.
	//
	// The `ctx` parameter is the return value supplied from the
	// `Hooks.PreResetSession` method, and may be nil.
	PostResetSession func(ctx interface{}, conn *Conn, err error) error
}

type HooksContext struct {
	// PrePing is a callback that gets called prior to calling
	// `Conn.Ping`, and is ALWAYS called. If this callback returns an
	// error, the underlying driver's `Conn.Ping` and `Hooks.Ping` methods
	// are not called.
	//
	// The first return value is passed to both `Hooks.Ping` and
	// `Hooks.PostPing` callbacks. You may specify anything you want.
	// Return nil if you do not need to use it.
	//
	// The second return value is indicates the error found while
	// executing this hook. If this callback returns an error,
	// the underlying driver's `Conn.Ping` method and `Hooks.Ping`
	// methods are not called.
	PrePing func(c context.Context, conn *Conn) (interface{}, error)

	// Ping is called after the underlying driver's `Conn.Ping` method
	// returns without any errors.
	//
	// The `ctx` parameter is the return value supplied from the
	// `Hooks.PrePing` method, and may be nil.
	//
	// If this callback returns an error, then the error from this
	// callback is returned by the `Conn.Ping` method.
	Ping func(c context.Context, ctx interface{}, conn *Conn) error

	// PostPing is a callback that gets called at the end of
	// the call to `Conn.Ping`. It is ALWAYS called.
	//
	// The `ctx` parameter is the return value supplied from the
	// `Hooks.PrePing` method, and may be nil.
	PostPing func(c context.Context, ctx interface{}, conn *Conn, err error) error

	// PreOpen is a callback that gets called before any
	// attempt to open the sql connection is made, and is ALWAYS
	// called.
	//
	// The first return value is passed to both `Hooks.Open` and
	// `Hooks.PostOpen` callbacks. You may specify anything you want.
	// Return nil if you do not need to use it.
	//
	// The second return value is indicates the error found while
	// executing this hook. If this callback returns an error,
	// the underlying driver's `Driver.Open` method and `Hooks.Open`
	// methods are not called.
	PreOpen func(c context.Context, name string) (interface{}, error)

	// Open is called after the underlying driver's `Driver.Open` method
	// returns without any errors.
	//
	// The `ctx` parameter is the return value supplied from the
	// `Hooks.PreOpen` method, and may be nil.
	//
	// If this callback returns an error, then the `conn` object is
	// closed by calling the `Close` method, and the error from this
	// callback is returned by the `db.Open` method.
	Open func(c context.Context, ctx interface{}, conn *Conn) error

	// PostOpen is a callback that gets called at the end of
	// the call to `db.Open(). It is ALWAYS called.
	//
	// The `ctx` parameter is the return value supplied from the
	// `Hooks.PreOpen` method, and may be nil.
	PostOpen func(c context.Context, ctx interface{}, conn *Conn, err error) error

	// PrePrepare is a callback that gets called prior to calling
	// `db.Prepare`, and is ALWAYS called. If this callback returns an
	// error, the underlying driver's `db.Exec` and `Hooks.Prepare` methods
	// are not called.
	//
	// The first return value is passed to both `Hooks.Prepare` and
	// `Hooks.PostPrepare` callbacks. You may specify anything you want.
	// Return nil if you do not need to use it.
	//
	// The second return value is indicates the error found while
	// executing this hook.
	PrePrepare func(c context.Context, stmt *Stmt) (interface{}, error)

	// Prepare is called after the underlying driver's `db.Prepare` method
	// returns without any errors.
	//
	// The `ctx` parameter is the return value supplied from the
	// `Hooks.PrePrepare` method, and may be nil.
	//
	// If this callback returns an error, then the error from this
	// callback is returned by the `db.Prepare` method.
	Prepare func(c context.Context, ctx interface{}, stmt *Stmt) error

	// PostPrepare is a callback that gets called at the end of
	// the call to `db.Prepare`. It is ALWAYS called.
	//
	// The `ctx` parameter is the return value supplied from the
	// `Hooks.PrePrepare` method, and may be nil.
	PostPrepare func(c context.Context, ctx interface{}, stmt *Stmt, err error) error

	// PreExec is a callback that gets called prior to calling
	// `Stmt.Exec`, and is ALWAYS called. If this callback returns an
	// error, the underlying driver's `Stmt.Exec` and `Hooks.Exec` methods
	// are not called.
	//
	// The first return value is passed to both `Hooks.Exec` and
	// `Hooks.PostExec` callbacks. You may specify anything you want.
	// Return nil if you do not need to use it.
	//
	// The second return value is indicates the error found while
	// executing this hook. If this callback returns an error,
	// the underlying driver's `Driver.Exec` method and `Hooks.Exec`
	// methods are not called.
	PreExec func(c context.Context, stmt *Stmt, args []driver.NamedValue) (interface{}, error)

	// Exec is called after the underlying driver's `Driver.Exec` method
	// returns without any errors.
	//
	// The `ctx` parameter is the return value supplied from the
	// `Hooks.PreExec` method, and may be nil.
	//
	// If this callback returns an error, then the error from this
	// callback is returned by the `Stmt.Exec` method.
	Exec func(c context.Context, ctx interface{}, stmt *Stmt, args []driver.NamedValue, result driver.Result) error

	// PostExec is a callback that gets called at the end of
	// the call to `Stmt.Exec`. It is ALWAYS called.
	//
	// The `ctx` parameter is the return value supplied from the
	// `Hooks.PreExec` method, and may be nil.
	PostExec func(c context.Context, ctx interface{}, stmt *Stmt, args []driver.NamedValue, result driver.Result, err error) error

	// PreQuery is a callback that gets called prior to calling
	// `Stmt.Query`, and is ALWAYS called. If this callback returns an
	// error, the underlying driver's `Stmt.Query` and `Hooks.Query` methods
	// are not called.
	//
	// The first return value is passed to both `Hooks.Query` and
	// `Hooks.PostQuery` callbacks. You may specify anything you want.
	// Return nil if you do not need to use it.
	//
	// The second return value is indicates the error found while
	// executing this hook. If this callback returns an error,
	// the underlying driver's `Stmt.Query` method and `Hooks.Query`
	// methods are not called.
	PreQuery func(c context.Context, stmt *Stmt, args []driver.NamedValue) (interface{}, error)

	// Query is called after the underlying driver's `Stmt.Query` method
	// returns without any errors.
	//
	// The `ctx` parameter is the return value supplied from the
	// `Hooks.PreQuery` method, and may be nil.
	//
	// If this callback returns an error, then the error from this
	// callback is returned by the `Stmt.Query` method.
	Query func(c context.Context, ctx interface{}, stmt *Stmt, args []driver.NamedValue, rows driver.Rows) error

	// PostQuery is a callback that gets called at the end of
	// the call to `Stmt.Query`. It is ALWAYS called.
	//
	// The `ctx` parameter is the return value supplied from the
	// `Hooks.PreQuery` method, and may be nil.
	PostQuery func(c context.Context, ctx interface{}, stmt *Stmt, args []driver.NamedValue, rows driver.Rows, err error) error

	// PreBegin is a callback that gets called prior to calling
	// `Stmt.Begin`, and is ALWAYS called. If this callback returns an
	// error, the underlying driver's `Conn.Begin` and `Hooks.Begin` methods
	// are not called.
	//
	// The first return value is passed to both `Hooks.Begin` and
	// `Hooks.PostBegin` callbacks. You may specify anything you want.
	// Return nil if you do not need to use it.
	//
	// The second return value is indicates the error found while
	// executing this hook. If this callback returns an error,
	// the underlying driver's `Conn.Begin` method and `Hooks.Begin`
	// methods are not called.
	PreBegin func(c context.Context, conn *Conn) (interface{}, error)

	// Begin is called after the underlying driver's `Conn.Begin` method
	// returns without any errors.
	//
	// The `ctx` parameter is the return value supplied from the
	// `Hooks.PreBegin` method, and may be nil.
	//
	// If this callback returns an error, then the error from this
	// callback is returned by the `Conn.Begin` method.
	Begin func(c context.Context, ctx interface{}, conn *Conn) error

	// PostBegin is a callback that gets called at the end of
	// the call to `Conn.Begin`. It is ALWAYS called.
	//
	// The `ctx` parameter is the return value supplied from the
	// `Hooks.PreBegin` method, and may be nil.
	PostBegin func(c context.Context, ctx interface{}, conn *Conn, err error) error

	// PreCommit is a callback that gets called prior to calling
	// `Tx.Commit`, and is ALWAYS called. If this callback returns an
	// error, the underlying driver's `Tx.Commit` and `Hooks.Commit` methods
	// are not called.
	//
	// The first return value is passed to both `Hooks.Commit` and
	// `Hooks.PostCommit` callbacks. You may specify anything you want.
	// Return nil if you do not need to use it.
	//
	// The second return value is indicates the error found while
	// executing this hook. If this callback returns an error,
	// the underlying driver's `Tx.Commit` method and `Hooks.Commit`
	// methods are not called.
	PreCommit func(c context.Context, tx *Tx) (interface{}, error)

	// Commit is called after the underlying driver's `Tx.Commit` method
	// returns without any errors.
	//
	// The `ctx` parameter is the return value supplied from the
	// `Hooks.PreCommit` method, and may be nil.
	//
	// If this callback returns an error, then the error from this
	// callback is returned by the `Tx.Commit` method.
	Commit func(c context.Context, ctx interface{}, tx *Tx) error

	// PostCommit is a callback that gets called at the end of
	// the call to `Tx.Commit`. It is ALWAYS called.
	//
	// The `ctx` parameter is the return value supplied from the
	// `Hooks.PreCommit` method, and may be nil.
	PostCommit func(c context.Context, ctx interface{}, tx *Tx, err error) error

	// PreRollback is a callback that gets called prior to calling
	// `Tx.Rollback`, and is ALWAYS called. If this callback returns an
	// error, the underlying driver's `Tx.Rollback` and `Hooks.Rollback` methods
	// are not called.
	//
	// The first return value is passed to both `Hooks.Rollback` and
	// `Hooks.PostRollback` callbacks. You may specify anything you want.
	// Return nil if you do not need to use it.
	//
	// The second return value is indicates the error found while
	// executing this hook. If this callback returns an error,
	// the underlying driver's `Tx.Rollback` method and `Hooks.Rollback`
	PreRollback func(c context.Context, tx *Tx) (interface{}, error)

	// Rollback is called after the underlying driver's `Tx.Rollback` method
	// returns without any errors.
	//
	// The `ctx` parameter is the return value supplied from the
	// `Hooks.PreRollback` method, and may be nil.
	//
	// If this callback returns an error, then the error from this
	// callback is returned by the `Tx.Rollback` method.
	Rollback func(c context.Context, ctx interface{}, tx *Tx) error

	// PostRollback is a callback that gets called at the end of
	// the call to `Tx.Rollback`. It is ALWAYS called.
	//
	// The `ctx` parameter is the return value supplied from the
	// `Hooks.PreRollback` method, and may be nil.
	PostRollback func(c context.Context, ctx interface{}, tx *Tx, err error) error

	// PreClose is a callback that gets called prior to calling
	// `Conn.Close`, and is ALWAYS called. If this callback returns an
	// error, the underlying driver's `Conn.Close` and `Hooks.Close` methods
	// are not called.
	//
	// The first return value is passed to both `Hooks.Close` and
	// `Hooks.PostClose` callbacks. You may specify anything you want.
	// Return nil if you do not need to use it.
	//
	// The second return value is indicates the error found while
	// executing this hook. If this callback returns an error,
	// the underlying driver's `Conn.Close` method and `Hooks.Close`
	// methods are not called.
	PreClose func(c context.Context, conn *Conn) (interface{}, error)

	// Close is called after the underlying driver's `Conn.Close` method
	// returns without any errors.
	//
	// The `ctx` parameter is the return value supplied from the
	// `Hooks.PreClose` method, and may be nil.
	//
	// If this callback returns an error, then the error from this
	// callback is returned by the `Conn.Close` method.
	Close func(c context.Context, ctx interface{}, conn *Conn) error

	// PostClose is a callback that gets called at the end of
	// the call to `Conn.Close`. It is ALWAYS called.
	//
	// The `ctx` parameter is the return value supplied from the
	// `Hooks.PreClose` method, and may be nil.
	PostClose func(c context.Context, ctx interface{}, conn *Conn, err error) error

	// PreResetSession is a callback that gets called prior to calling
	// `Conn.ResetSession`, and is ALWAYS called. If this callback returns an
	// error, the underlying driver's `Conn.ResetSession` and `Hooks.ResetSession` methods
	// are not called.
	//
	// The first return value is passed to both `Hooks.ResetSession` and
	// `Hooks.PostResetSession` callbacks. You may specify anything you want.
	// Return nil if you do not need to use it.
	//
	// The second return value is indicates the error found while
	// executing this hook. If this callback returns an error,
	// the underlying driver's `Conn.ResetSession` method and `Hooks.ResetSession`
	// methods are not called.
	PreResetSession func(c context.Context, conn *Conn) (interface{}, error)

	// ResetSession is called after the underlying driver's `Conn.ResetSession` method
	// returns without any errors.
	//
	// The `ctx` parameter is the return value supplied from the
	// `Hooks.PreResetSession` method, and may be nil.
	//
	// If this callback returns an error, then the error from this
	// callback is returned by the `Conn.ResetSession` method.
	ResetSession func(c context.Context, ctx interface{}, conn *Conn) error

	// PostResetSession is a callback that gets called at the end of
	// the call to `Conn.ResetSession`. It is ALWAYS called.
	//
	// The `ctx` parameter is the return value supplied from the
	// `Hooks.PreResetSession` method, and may be nil.
	PostResetSession func(c context.Context, ctx interface{}, conn *Conn, err error) error

	// PreIsValid is a callback that gets called prior to calling
	// `Conn.IsValid`, and is ALWAYS called. If this callback returns an
	// error, the underlying driver's `Conn.IsValid` and `Hooks.IsValid` methods
	// are not called.
	//
	// The first return value is passed to both `Hooks.IsValid` and
	// `Hooks.PostIsValid` callbacks. You may specify anything you want.
	// Return nil if you do not need to use it.
	//
	// The second return value is indicates the error found while
	// executing this hook. If this callback returns an error,
	// the connection is marked as invalid.
	PreIsValid func(conn *Conn) (interface{}, error)

	// IsValid is called after the underlying driver's `Conn.IsValid` method
	// returns true.
	//
	// The `ctx` parameter is the return value supplied from the
	// `Hooks.PreIsValid` method, and may be nil.
	//
	// If this callback returns an error, the connection is marked as invalid.
	IsValid func(ctx interface{}, conn *Conn) error

	// PostPostIsValid is a callback that gets called at the end of
	// the call to `Conn.PostIsValid`. It is ALWAYS called.
	//
	// The `ctx` parameter is the return value supplied from the
	// `Hooks.PrePostIsValid` method, and may be nil.
	PostIsValid func(ctx interface{}, conn *Conn, valid bool) error
}

type Outputter interface {
	Output(calldepth int, s string) error
}

type PackageFilter map[string]struct{}

type Proxy struct {
	Driver driver.Driver
	// contains filtered or unexported fields
}

type Stmt struct {
	// Stmt is the original statement.
	// It may be nil because some sql drivers support skipping Prepare.
	Stmt driver.Stmt

	QueryString string
	Proxy       *Proxy
	Conn        *Conn
}

type TracerOptions struct {
	// Outputter is the output of the log.
	// If is nil nil, log.Output is used.
	Outputter Outputter

	// Filter is used by the tracing proxy for skipping database libraries (e.g. O/R mapper).
	// If it is nil, DefaultPackageFilter is used.
	Filter Filter

	// SlowQuery is a threshold duration to output into log.
	// output all queries if SlowQuery is zero.
	SlowQuery time.Duration
}

type Tx struct {
	Tx    driver.Tx
	Proxy *Proxy
	Conn  *Conn
	// contains filtered or unexported fields
}