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Implement sqlexp Messages for Query/QueryContext (#690)
* Ask for usedb and set language messages * add functional test for message queue * first basic version of msg queue * complete messages implementation * fix lint and build issues * fix test to avoid 0 rows in a query * add sqlexp to appveyor yml * fix build * fix the merge * move messageq tests to go1.9 * fix example function and support env vars * implement data type discovery * fix pipeline variables for tests
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,63 @@ | ||
| // +build go1.14 | ||
|
|
||
| package mssql | ||
|
|
||
| import ( | ||
| "testing" | ||
| ) | ||
|
|
||
| func BenchmarkMessageQueue(b *testing.B) { | ||
| conn, logger := open(b) | ||
| defer conn.Close() | ||
| defer logger.StopLogging() | ||
|
|
||
| b.Run("BlockingQuery", func(b *testing.B) { | ||
| var errs, results float64 | ||
| for i := 0; i < b.N; i++ { | ||
| r, err := conn.Query(mixedQuery) | ||
| if err != nil { | ||
| b.Fatal(err.Error()) | ||
| } | ||
| defer r.Close() | ||
| active := true | ||
| first := true | ||
| for active { | ||
| active = r.Next() | ||
| if active && first { | ||
| results++ | ||
| } | ||
| first = false | ||
| if !active { | ||
| if r.Err() != nil { | ||
| b.Logf("r.Err:%v", r.Err()) | ||
| errs++ | ||
| } | ||
| active = r.NextResultSet() | ||
| if active { | ||
| first = true | ||
| } | ||
| } | ||
| } | ||
| } | ||
| b.ReportMetric(float64(0), "msgs/op") | ||
| b.ReportMetric(errs/float64(b.N), "errors/op") | ||
| b.ReportMetric(results/float64(b.N), "results/op") | ||
| }) | ||
| b.Run("NonblockingQuery", func(b *testing.B) { | ||
| var msgs, errs, results, rowcounts float64 | ||
| for i := 0; i < b.N; i++ { | ||
| m, e, r, rc := testMixedQuery(conn, b) | ||
| msgs += float64(m) | ||
| errs += float64(e) | ||
| results += float64(r) | ||
| rowcounts += float64(rc) | ||
| if r != 4 { | ||
| b.Fatalf("Got wrong results count: %d, expected 4", r) | ||
| } | ||
| } | ||
| b.ReportMetric(msgs/float64(b.N), "msgs/op") | ||
| b.ReportMetric(errs/float64(b.N), "errors/op") | ||
| b.ReportMetric(results/float64(b.N), "results/op") | ||
| b.ReportMetric(rowcounts/float64(b.N), "rowcounts/op") | ||
| }) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,76 @@ | ||
| //go:build go1.10 | ||
| // +build go1.10 | ||
|
|
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| package mssql_test | ||
|
|
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| import ( | ||
| "context" | ||
| "database/sql" | ||
| "fmt" | ||
| "log" | ||
|
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| mssql "github.com/denisenkom/go-mssqldb" | ||
| "github.com/golang-sql/sqlexp" | ||
| ) | ||
|
|
||
| const ( | ||
| msgQuery = `select 'name' as Name | ||
| PRINT N'This is a message' | ||
| select 199 | ||
| RAISERROR (N'Testing!' , 11, 1) | ||
| select 300 | ||
| ` | ||
| ) | ||
|
|
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| // This example shows the usage of sqlexp/Messages | ||
| func ExampleRows_usingmessages() { | ||
|
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| connString := makeConnURL().String() | ||
|
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| // Create a new connector object by calling NewConnector | ||
| connector, err := mssql.NewConnector(connString) | ||
| if err != nil { | ||
| log.Println(err) | ||
| return | ||
| } | ||
|
|
||
| // Pass connector to sql.OpenDB to get a sql.DB object | ||
| db := sql.OpenDB(connector) | ||
| defer db.Close() | ||
| retmsg := &sqlexp.ReturnMessage{} | ||
| ctx := context.Background() | ||
| rows, err := db.QueryContext(ctx, msgQuery, retmsg) | ||
| if err != nil { | ||
| log.Fatalf("QueryContext failed: %v", err) | ||
| } | ||
| active := true | ||
| for active { | ||
| msg := retmsg.Message(ctx) | ||
| switch m := msg.(type) { | ||
| case sqlexp.MsgNotice: | ||
| fmt.Println(m.Message) | ||
| case sqlexp.MsgNext: | ||
| inresult := true | ||
| for inresult { | ||
| inresult = rows.Next() | ||
| if inresult { | ||
| cols, err := rows.Columns() | ||
| if err != nil { | ||
| log.Fatalf("Columns failed: %v", err) | ||
| } | ||
| fmt.Println(cols) | ||
| var d interface{} | ||
| if err = rows.Scan(&d); err == nil { | ||
| fmt.Println(d) | ||
| } | ||
| } | ||
| } | ||
| case sqlexp.MsgNextResultSet: | ||
| active = rows.NextResultSet() | ||
| case sqlexp.MsgError: | ||
| fmt.Println("Error:", m.Error) | ||
| case sqlexp.MsgRowsAffected: | ||
| fmt.Println("Rows affected:", m.Count) | ||
| } | ||
| } | ||
| } |
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