pgxmock

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 Go to latest Published: Nov 6, 2022 License: BSD-3-Clause Imports: 16 Imported by: 0

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pgx driver mock for Golang

pgxmock is a mock library implementing pgx - PostgreSQL Driver and Toolkit. It's based on the well-known sqlmock library for sql/driver.

pgxmock has one and only purpose - to simulate pgx behavior in tests, without needing a real database connection. It helps to maintain correct TDD workflow.

  • this library is not complete and not stable (issues and pull requests are welcome);
  • written based on go1.15 version, however, should be compatible with go1.11 and above;
  • does not require any modifications to your source code;
  • has strict by default expectation order matching;
  • has no third party dependencies except pgx packages.

Install

go get github.com/pashagolub/pgxmock

Documentation and Examples

Visit godoc for general examples and public api reference.

See implementation examples:

Something you may want to test
package main

import (
	"context"

	pgx "github.com/jackc/pgx/v4"
)

type PgxIface interface {
	Begin(context.Context) (pgx.Tx, error)
	Close(context.Context) error
}

func recordStats(db PgxIface, userID, productID int) (err error) {
	tx, err := db.Begin(context.Background())
	if err != nil {
		return
	}

	defer func() {
		switch err {
		case nil:
			err = tx.Commit(context.Background())
		default:
			_ = tx.Rollback(context.Background())
		}
	}()

	if _, err = tx.Exec(context.Background(), "UPDATE products SET views = views + 1"); err != nil {
		return
	}
	if _, err = tx.Exec(context.Background(), "INSERT INTO product_viewers (user_id, product_id) VALUES (?, ?)", userID, productID); err != nil {
		return
	}
	return
}

func main() {
	// @NOTE: the real connection is not required for tests
	db, err := pgx.Connect(context.Background(), "postgres://rolname@hostname/dbname")
	if err != nil {
		panic(err)
	}
	defer db.Close(context.Background())

	if err = recordStats(db, 1 /*some user id*/, 5 /*some product id*/); err != nil {
		panic(err)
	}
}
Tests with pgxmock
package main

import (
	"context"
	"fmt"
	"testing"

	"github.com/pashagolub/pgxmock"
)

// a successful case
func TestShouldUpdateStats(t *testing.T) {
	mock, err := pgxmock.NewConn()
	if err != nil {
		t.Fatalf("an error '%s' was not expected when opening a stub database connection", err)
	}
	defer mock.Close(context.Background())

	mock.ExpectBegin()
	mock.ExpectExec("UPDATE products").WillReturnResult(pgxmock.NewResult("UPDATE", 1))
	mock.ExpectExec("INSERT INTO product_viewers").WithArgs(2, 3).WillReturnResult(pgxmock.NewResult("INSERT", 1))
	mock.ExpectCommit()

	// now we execute our method
	if err = recordStats(mock, 2, 3); err != nil {
		t.Errorf("error was not expected while updating stats: %s", err)
	}

	// we make sure that all expectations were met
	if err := mock.ExpectationsWereMet(); err != nil {
		t.Errorf("there were unfulfilled expectations: %s", err)
	}
}

// a failing test case
func TestShouldRollbackStatUpdatesOnFailure(t *testing.T) {
	mock, err := pgxmock.NewConn()
	if err != nil {
		t.Fatalf("an error '%s' was not expected when opening a stub database connection", err)
	}
	defer mock.Close(context.Background())

	mock.ExpectBegin()
	mock.ExpectExec("UPDATE products").WillReturnResult(pgxmock.NewResult("UPDATE", 1))
	mock.ExpectExec("INSERT INTO product_viewers").
		WithArgs(2, 3).
		WillReturnError(fmt.Errorf("some error"))
	mock.ExpectRollback()

	// now we execute our method
	if err = recordStats(mock, 2, 3); err == nil {
		t.Errorf("was expecting an error, but there was none")
	}

	// we make sure that all expectations were met
	if err := mock.ExpectationsWereMet(); err != nil {
		t.Errorf("there were unfulfilled expectations: %s", err)
	}
}

Customize SQL query matching

There were plenty of requests from users regarding SQL query string validation or different matching option. We have now implemented the QueryMatcher interface, which can be passed through an option when calling pgxmock.New or pgxmock.NewWithDSN.

This now allows to include some library, which would allow for example to parse and validate SQL AST. And create a custom QueryMatcher in order to validate SQL in sophisticated ways.

By default, pgxmock is preserving backward compatibility and default query matcher is pgxmock.QueryMatcherRegexp which uses expected SQL string as a regular expression to match incoming query string. There is an equality matcher: QueryMatcherEqual which will do a full case sensitive match.

In order to customize the QueryMatcher, use the following:

	mock, err := pgxmock.New(context.Background(), sqlmock.QueryMatcherOption(pgxmock.QueryMatcherEqual))

The query matcher can be fully customized based on user needs. pgxmock will not provide a standard sql parsing matchers.

Matching arguments like time.Time

There may be arguments which are of struct type and cannot be compared easily by value like time.Time. In this case pgxmock provides an Argument interface which can be used in more sophisticated matching. Here is a simple example of time argument matching:

type AnyTime struct{}

// Match satisfies sqlmock.Argument interface
func (a AnyTime) Match(v interface{}) bool {
	_, ok := v.(time.Time)
	return ok
}

func TestAnyTimeArgument(t *testing.T) {
	t.Parallel()
	db, mock, err := New()
	if err != nil {
		t.Errorf("an error '%s' was not expected when opening a stub database connection", err)
	}
	defer db.Close()

	mock.ExpectExec("INSERT INTO users").
		WithArgs("john", AnyTime{}).
		WillReturnResult(NewResult(1, 1))

	_, err = db.Exec("INSERT INTO users(name, created_at) VALUES (?, ?)", "john", time.Now())
	if err != nil {
		t.Errorf("error '%s' was not expected, while inserting a row", err)
	}

	if err := mock.ExpectationsWereMet(); err != nil {
		t.Errorf("there were unfulfilled expectations: %s", err)
	}
}

It only asserts that argument is of time.Time type.

Run tests

go test -race

Contributions

Feel free to open a pull request. Note, if you wish to contribute an extension to public (exported methods or types) - please open an issue before, to discuss whether these changes can be accepted. All backward incompatible changes are and will be treated cautiously

License

The three clause BSD license

Documentation

Overview

package pgxmock is a mock library implementing pgx connector. Which has one and only purpose - to simulate pgx driver behavior in tests, without needing a real database connection. It helps to maintain correct **TDD** workflow.

It does not require (almost) any modifications to your source code in order to test and mock database operations. Supports concurrency and multiple database mocking.

The driver allows to mock any pgx driver method behavior.

Index

Examples

Constants

This section is empty.

Variables

View Source 
var CSVColumnParser = func(s string) interface{} {
	switch {
	case strings.ToLower(s) == "null":
		return nil
	}
	return s
}

CSVColumnParser is a function which converts trimmed csv column string to a []byte representation. Currently transforms NULL to nil

View Source 
var ErrCancelled = errors.New("canceling query due to user request")

ErrCancelled defines an error value, which can be expected in case of such cancellation error.

Functions

func MonitorPingsOption 

func MonitorPingsOption(monitorPings bool) func(*pgxmock) error

MonitorPingsOption determines whether calls to Ping on the driver should be observed and mocked.

If true is passed, we will check these calls were expected. Expectations can be registered using the ExpectPing() method on the mock.

If false is passed or this option is omitted, calls to Ping will not be considered when determining expectations and calls to ExpectPing will have no effect.

func NewErrorResult 

func NewErrorResult(err error) pgconn.CommandTag

NewErrorResult creates a new sql driver Result which returns an error given for both interface methods

func NewResult 

func NewResult(op string, rowsAffected int64) pgconn.CommandTag

NewResult creates a new sql driver Result for Exec based query mocks.

func QueryMatcherOption 

func QueryMatcherOption(queryMatcher QueryMatcher) func(*pgxmock) error

QueryMatcherOption allows to customize SQL query matcher and match SQL query strings in more sophisticated ways. The default QueryMatcher is QueryMatcherRegexp.

Types

type Argument 

type Argument interface {
	Match(interface{}) bool
}

Argument interface allows to match any argument in specific way when used with ExpectedQuery and ExpectedExec expectations.

func AnyArg 

func AnyArg() Argument

AnyArg will return an Argument which can match any kind of arguments.

Useful for time.Time or similar kinds of arguments.

type ExpectedBegin 

type ExpectedBegin struct {
	// contains filtered or unexported fields
}

ExpectedBegin is used to manage *pgx.Begin expectation returned by pgxmock.ExpectBegin.

func (*ExpectedBegin) String 

func (e *ExpectedBegin) String() string

String returns string representation

func (*ExpectedBegin) WillDelayFor 

func (e *ExpectedBegin) WillDelayFor(duration time.Duration) *ExpectedBegin

WillDelayFor allows to specify duration for which it will delay result. May be used together with Context

func (*ExpectedBegin) WillReturnError 

func (e *ExpectedBegin) WillReturnError(err error) *ExpectedBegin

WillReturnError allows to set an error for pgx.Begin action

type ExpectedClose 

type ExpectedClose struct {
	// contains filtered or unexported fields
}

ExpectedClose is used to manage pgx.Close expectation returned by pgxmock.ExpectClose.

func (*ExpectedClose) String 

func (e *ExpectedClose) String() string

String returns string representation

func (*ExpectedClose) WillReturnError 

func (e *ExpectedClose) WillReturnError(err error) *ExpectedClose

WillReturnError allows to set an error for pgx.Close action

type ExpectedCommit 

type ExpectedCommit struct {
	// contains filtered or unexported fields
}

ExpectedCommit is used to manage pgx.Tx.Commit expectation returned by pgxmock.ExpectCommit.

func (*ExpectedCommit) String 

func (e *ExpectedCommit) String() string

String returns string representation

func (*ExpectedCommit) WillReturnError 

func (e *ExpectedCommit) WillReturnError(err error) *ExpectedCommit

WillReturnError allows to set an error for pgx.Tx.Close action

type ExpectedCopyFrom 

type ExpectedCopyFrom struct {
	// contains filtered or unexported fields
}

ExpectedCopyFrom is used to manage *pgx.Conn.CopyFrom expectations. Returned by *Pgxmock.ExpectCopyFrom.

func (*ExpectedCopyFrom) String 

func (e *ExpectedCopyFrom) String() string

String returns string representation

func (*ExpectedCopyFrom) WillDelayFor 

func (e *ExpectedCopyFrom) WillDelayFor(duration time.Duration) *ExpectedCopyFrom

WillDelayFor allows to specify duration for which it will delay result. May be used together with Context

func (*ExpectedCopyFrom) WillReturnError 

func (e *ExpectedCopyFrom) WillReturnError(err error) *ExpectedCopyFrom

WillReturnError allows to set an error for expected database exec action

func (*ExpectedCopyFrom) WillReturnResult 

func (e *ExpectedCopyFrom) WillReturnResult(result int64) *ExpectedCopyFrom

WillReturnResult arranges for an expected Exec() to return a particular result, there is pgxmock.NewResult(lastInsertID int64, affectedRows int64) method to build a corresponding result. Or if actions needs to be tested against errors pgxmock.NewErrorResult(err error) to return a given error.

type ExpectedExec 

type ExpectedExec struct {
	// contains filtered or unexported fields
}

ExpectedExec is used to manage pgx.Exec, pgx.Tx.Exec or pgx.Stmt.Exec expectations. Returned by pgxmock.ExpectExec.

Example 
mock, _ := NewConn()
result := NewErrorResult(fmt.Errorf("some error"))
mock.ExpectExec("^INSERT (.+)").WillReturnResult(result)
res, _ := mock.Exec(context.Background(), "INSERT something")
s := res.String()
fmt.Println(s)

Output:

some error

func (*ExpectedExec) String 

func (e *ExpectedExec) String() string

String returns string representation

func (*ExpectedExec) WillDelayFor 

func (e *ExpectedExec) WillDelayFor(duration time.Duration) *ExpectedExec

WillDelayFor allows to specify duration for which it will delay result. May be used together with Context

func (*ExpectedExec) WillReturnError 

func (e *ExpectedExec) WillReturnError(err error) *ExpectedExec

WillReturnError allows to set an error for expected database exec action

func (*ExpectedExec) WillReturnResult 

func (e *ExpectedExec) WillReturnResult(result pgconn.CommandTag) *ExpectedExec

WillReturnResult arranges for an expected Exec() to return a particular result, there is pgxmock.NewResult(lastInsertID int64, affectedRows int64) method to build a corresponding result. Or if actions needs to be tested against errors pgxmock.NewErrorResult(err error) to return a given error.

func (*ExpectedExec) WithArgs 

func (e *ExpectedExec) WithArgs(args ...interface{}) *ExpectedExec

WithArgs will match given expected args to actual database exec operation arguments. if at least one argument does not match, it will return an error. For specific arguments an pgxmock.Argument interface can be used to match an argument.

type ExpectedPing 

type ExpectedPing struct {
	// contains filtered or unexported fields
}

ExpectedPing is used to manage pgx.Ping expectations. Returned by pgxmock.ExpectPing.

func (*ExpectedPing) String 

func (e *ExpectedPing) String() string

String returns string representation

func (*ExpectedPing) WillDelayFor 

func (e *ExpectedPing) WillDelayFor(duration time.Duration) *ExpectedPing

WillDelayFor allows to specify duration for which it will delay result. May be used together with Context.

func (*ExpectedPing) WillReturnError 

func (e *ExpectedPing) WillReturnError(err error) *ExpectedPing

WillReturnError allows to set an error for expected database ping

type ExpectedPrepare 

type ExpectedPrepare struct {
	// contains filtered or unexported fields
}

ExpectedPrepare is used to manage pgx.Prepare or pgx.Tx.Prepare expectations. Returned by pgxmock.ExpectPrepare.

func (*ExpectedPrepare) ExpectExec 

func (e *ExpectedPrepare) ExpectExec() *ExpectedExec

ExpectExec allows to expect Exec() on this prepared statement. This method is convenient in order to prevent duplicating sql query string matching.

func (*ExpectedPrepare) ExpectQuery 

func (e *ExpectedPrepare) ExpectQuery() *ExpectedQuery

ExpectQuery allows to expect Query() or QueryRow() on this prepared statement. This method is convenient in order to prevent duplicating sql query string matching.

func (*ExpectedPrepare) String 

func (e *ExpectedPrepare) String() string

String returns string representation

func (*ExpectedPrepare) WillBeClosed 

func (e *ExpectedPrepare) WillBeClosed() *ExpectedPrepare

WillBeClosed expects this prepared statement to be closed.

func (*ExpectedPrepare) WillDelayFor 

func (e *ExpectedPrepare) WillDelayFor(duration time.Duration) *ExpectedPrepare

WillDelayFor allows to specify duration for which it will delay result. May be used together with Context

func (*ExpectedPrepare) WillReturnCloseError 

func (e *ExpectedPrepare) WillReturnCloseError(err error) *ExpectedPrepare

WillReturnCloseError allows to set an error for this prepared statement Close action

func (*ExpectedPrepare) WillReturnError 

func (e *ExpectedPrepare) WillReturnError(err error) *ExpectedPrepare

WillReturnError allows to set an error for the expected pgx.Prepare or pgx.Tx.Prepare action.

type ExpectedQuery 

type ExpectedQuery struct {
	// contains filtered or unexported fields
}

ExpectedQuery is used to manage *pgx.Conn.Query, *pgx.Conn.QueryRow, *pgx.Tx.Query, *pgx.Tx.QueryRow, *pgx.Stmt.Query or *pgx.Stmt.QueryRow expectations. Returned by pgxmock.ExpectQuery.

func (*ExpectedQuery) RowsWillBeClosed 

func (e *ExpectedQuery) RowsWillBeClosed() *ExpectedQuery

RowsWillBeClosed expects this query rows to be closed.

func (*ExpectedQuery) String 

func (e *ExpectedQuery) String() string

String returns string representation

func (*ExpectedQuery) WillDelayFor 

func (e *ExpectedQuery) WillDelayFor(duration time.Duration) *ExpectedQuery

WillDelayFor allows to specify duration for which it will delay result. May be used together with Context

func (*ExpectedQuery) WillReturnError 

func (e *ExpectedQuery) WillReturnError(err error) *ExpectedQuery

WillReturnError allows to set an error for expected database query

func (*ExpectedQuery) WillReturnRows 

func (e *ExpectedQuery) WillReturnRows(rows ...*Rows) *ExpectedQuery

WillReturnRows specifies the set of resulting rows that will be returned by the triggered query

func (*ExpectedQuery) WithArgs 

func (e *ExpectedQuery) WithArgs(args ...interface{}) *ExpectedQuery

WithArgs will match given expected args to actual database query arguments. if at least one argument does not match, it will return an error. For specific arguments an pgxmock.Argument interface can be used to match an argument.

type ExpectedRollback 

type ExpectedRollback struct {
	// contains filtered or unexported fields
}

ExpectedRollback is used to manage pgx.Tx.Rollback expectation returned by pgxmock.ExpectRollback.

func (*ExpectedRollback) String 

func (e *ExpectedRollback) String() string

String returns string representation

func (*ExpectedRollback) WillReturnError 

func (e *ExpectedRollback) WillReturnError(err error) *ExpectedRollback

WillReturnError allows to set an error for pgx.Tx.Rollback action

type PgxConnIface 

type PgxConnIface interface {
	pgx.Tx
	Close(ctx context.Context) error
	// contains filtered or unexported methods
}

func NewConn 

func NewConn(options ...func(*pgxmock) error) (PgxConnIface, error)

NewConn creates PgxConnIface database connection and a mock to manage expectations. Accepts options, like ValueConverterOption, to use a ValueConverter from a specific driver. Pings db so that all expectations could be asserted.

type PgxPoolIface 

type PgxPoolIface interface {
	pgx.Tx
	Acquire(ctx context.Context) (*pgxpool.Conn, error)
	Close()
	// contains filtered or unexported methods
}

func NewPool 

func NewPool(options ...func(*pgxmock) error) (PgxPoolIface, error)

NewPool creates PgxPoolIface pool of database connections and a mock to manage expectations. Accepts options, like ValueConverterOption, to use a ValueConverter from a specific driver. Pings db so that all expectations could be asserted.

type QueryMatcher 

type QueryMatcher interface {

	// Match expected SQL query string without whitespace to
	// actual SQL.
	Match(expectedSQL, actualSQL string) error
}

QueryMatcher is an SQL query string matcher interface, which can be used to customize validation of SQL query strings. As an example, external library could be used to build and validate SQL ast, columns selected.

pgxmock can be customized to implement a different QueryMatcher configured through an option when pgxmock.New or pgxmock.NewWithDSN is called, default QueryMatcher is QueryMatcherRegexp.

Example 
// configure to use case sensitive SQL query matcher
// instead of default regular expression matcher
mock, err := NewConn(QueryMatcherOption(QueryMatcherEqual), MonitorPingsOption(true))
if err != nil {
	fmt.Println("failed to open pgxmock database:", err)
}
// defer db.Close()

rows := NewRows([]string{"id", "title"}).
	AddRow(1, "one").
	AddRow(2, "two")

mock.ExpectQuery("SELECT * FROM users").WillReturnRows(rows)

rs, err := mock.Query(context.Background(), "SELECT * FROM users")
if err != nil {
	fmt.Println("failed to match expected query")
	return
}
defer rs.Close()

for rs.Next() {
	var id int
	var title string
	_ = rs.Scan(&id, &title)
	fmt.Println("scanned id:", id, "and title:", title)
}

if rs.Err() != nil {
	fmt.Println("got rows error:", rs.Err())
}

Output:

scanned id: 1 and title: one
scanned id: 2 and title: two

var QueryMatcherEqual QueryMatcher = QueryMatcherFunc(func(expectedSQL, actualSQL string) error {
	expect := stripQuery(expectedSQL)
	actual := stripQuery(actualSQL)
	if actual != expect {
		return fmt.Errorf(`actual sql: "%s" does not equal to expected "%s"`, actual, expect)
	}
	return nil
})

QueryMatcherEqual is the SQL query matcher which simply tries a case sensitive match of expected and actual SQL strings without whitespace. 

var QueryMatcherRegexp QueryMatcher = QueryMatcherFunc(func(expectedSQL, actualSQL string) error {
	expect := stripQuery(expectedSQL)
	actual := stripQuery(actualSQL)
	re, err := regexp.Compile(expect)
	if err != nil {
		return err
	}
	if !re.MatchString(actual) {
		return fmt.Errorf(`could not match actual sql: "%s" with expected regexp "%s"`, actual, re.String())
	}
	return nil
})

QueryMatcherRegexp is the default SQL query matcher used by pgxmock. It parses expectedSQL to a regular expression and attempts to match actualSQL.

type QueryMatcherFunc 

type QueryMatcherFunc func(expectedSQL, actualSQL string) error

QueryMatcherFunc type is an adapter to allow the use of ordinary functions as QueryMatcher. If f is a function with the appropriate signature, QueryMatcherFunc(f) is a QueryMatcher that calls f.

func (QueryMatcherFunc) Match 

func (f QueryMatcherFunc) Match(expectedSQL, actualSQL string) error

Match implements the QueryMatcher

type Rows 

type Rows struct {
	// contains filtered or unexported fields
}

Rows is a mocked collection of rows to return for Query result

Example 
mock, err := NewConn()
if err != nil {
	fmt.Println("failed to open pgxmock database:", err)
}
// defer mock.Close(context.Background())

rows := NewRows([]string{"id", "title"}).
	AddRow(1, "one").
	AddRow(2, "two").
	AddCommandTag(pgconn.CommandTag("SELECT 2"))

mock.ExpectQuery("SELECT").WillReturnRows(rows)

rs, _ := mock.Query(context.Background(), "SELECT")
defer rs.Close()

fmt.Println("command tag:", rs.CommandTag())
if len(rs.FieldDescriptions()) != 2 {
	fmt.Println("got wrong number of fields")
}

for rs.Next() {
	var id int
	var title string
	_ = rs.Scan(&id, &title)
	fmt.Println("scanned id:", id, "and title:", title)
}

if rs.Err() != nil {
	fmt.Println("got rows error:", rs.Err())
}

Output:

command tag: SELECT 2
scanned id: 1 and title: one
scanned id: 2 and title: two
Example (ExpectToBeClosed) 
mock, err := NewConn()
if err != nil {
	fmt.Println("failed to open pgxmock database:", err)
}
defer mock.Close(context.Background())

rows := NewRows([]string{"id", "title"}).AddRow(1, "john")
mock.ExpectQuery("SELECT").WillReturnRows(rows).RowsWillBeClosed()

_, _ = mock.Query(context.Background(), "SELECT")

if err := mock.ExpectationsWereMet(); err != nil {
	fmt.Println("got error:", err)
}

Output:

got error: expected query rows to be closed, but it was not: ExpectedQuery => expecting Query, QueryContext or QueryRow which:
  - matches sql: 'SELECT'
  - is without arguments
  - should return rows:
    row 0 - [1 john]
Example (RowError) 
mock, err := NewConn()
if err != nil {
	fmt.Println("failed to open pgxmock database:", err)
}
// defer mock.Close(context.Background())

rows := NewRows([]string{"id", "title"}).
	AddRow(0, "one").
	AddRow(1, "two").
	RowError(1, fmt.Errorf("row error"))
mock.ExpectQuery("SELECT").WillReturnRows(rows)

rs, _ := mock.Query(context.Background(), "SELECT")
defer rs.Close()

for rs.Next() {
	var id int
	var title string
	_ = rs.Scan(&id, &title)
	fmt.Println("scanned id:", id, "and title:", title)
	if rs.Err() != nil {
		fmt.Println("got rows error:", rs.Err())
	}
}

Output:

scanned id: 0 and title: one
scanned id: 1 and title: two
got rows error: row error

func NewRows 

func NewRows(columns []string) *Rows

NewRows allows Rows to be created from a sql interface{} slice or from the CSV string and to be used as sql driver.Rows. Use pgxmock.NewRows instead if using a custom converter

func NewRowsWithColumnDefinition 

func NewRowsWithColumnDefinition(columns ...pgproto3.FieldDescription) *Rows

NewRowsWithColumnDefinition return rows with columns metadata

func (*Rows) AddCommandTag 

func (r *Rows) AddCommandTag(tag pgconn.CommandTag) *Rows

AddCommandTag will add a command tag to the result set

func (*Rows) AddRow 

func (r *Rows) AddRow(values ...interface{}) *Rows

AddRow composed from database interface{} slice return the same instance to perform subsequent actions. Note that the number of values must match the number of columns

func (*Rows) CloseError 

func (r *Rows) CloseError(err error) *Rows

CloseError allows to set an error which will be returned by rows.Close function.

The close error will be triggered only in cases when rows.Next() EOF was not yet reached, that is a default sql library behavior

func (*Rows) FromCSVString 

func (r *Rows) FromCSVString(s string) *Rows

FromCSVString build rows from csv string. return the same instance to perform subsequent actions. Note that the number of values must match the number of columns

func (*Rows) RowError 

func (r *Rows) RowError(row int, err error) *Rows

RowError allows to set an error which will be returned when a given row number is read

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