github.com/cockroachdb/apd/v3@v3.2.0/sql_test.go (about)

     1  // Copyright 2017 The Cockroach Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
    12  // implied. See the License for the specific language governing
    13  // permissions and limitations under the License.
    14  
    15  //go:build sql
    16  // +build sql
    17  
    18  package apd
    19  
    20  import (
    21  	"database/sql"
    22  	"flag"
    23  	"testing"
    24  
    25  	_ "github.com/lib/pq"
    26  )
    27  
    28  var (
    29  	flagPostgres = flag.String("postgres", "postgres://postgres@localhost/apd?sslmode=disable", "Postgres connection string to an empty database")
    30  )
    31  
    32  // TestSQL tests the Scan and Value methods of Decimal.
    33  func TestSQL(t *testing.T) {
    34  	db, err := sql.Open("postgres", *flagPostgres)
    35  	if err != nil {
    36  		t.Fatal(err)
    37  	}
    38  	var a Decimal
    39  	if _, _, err = a.SetString("1234.567e5"); err != nil {
    40  		t.Fatal(err)
    41  	}
    42  	if _, err := db.Exec("drop table if exists d"); err != nil {
    43  		t.Fatal(err)
    44  	}
    45  	if _, err := db.Exec("create table d (v decimal)"); err != nil {
    46  		t.Fatal(err)
    47  	}
    48  	if _, err := db.Exec("insert into d values ($1)", a); err != nil {
    49  		t.Fatal(err)
    50  	}
    51  	if _, err := db.Exec("update d set v = v + 1e5"); err != nil {
    52  		t.Fatal(err)
    53  	}
    54  	var b, c, d Decimal
    55  	var nd NullDecimal
    56  	if err := db.QueryRow("select v, v::text, v::int, v::float, v from d").Scan(&a, &b, &c, &d, &nd); err != nil {
    57  		t.Fatal(err)
    58  	}
    59  	want, _, err := NewFromString("123556700")
    60  	if err != nil {
    61  		t.Fatal(err)
    62  	}
    63  	for i, v := range []*Decimal{&a, &b, &c, &d, &nd.Decimal} {
    64  		if v.Cmp(want) != 0 {
    65  			t.Fatalf("%d: unexpected: %s, want: %s", i, v.String(), want.String())
    66  		}
    67  	}
    68  
    69  	if _, err := db.Exec("update d set v = NULL"); err != nil {
    70  		t.Fatal(err)
    71  	}
    72  	if err := db.QueryRow("select v from d").Scan(&nd); err != nil {
    73  		t.Fatal(err)
    74  	}
    75  	if nd.Valid {
    76  		t.Fatal("expected null")
    77  	}
    78  
    79  	var g Decimal
    80  	if err := db.QueryRow("select 0::decimal(19,9)").Scan(&g); err != nil {
    81  		t.Fatal(err)
    82  	}
    83  	zeroD, _, err := NewFromString("0.000000000")
    84  	if err != nil {
    85  		t.Fatal(err)
    86  	}
    87  	if g.String() != zeroD.String() {
    88  		t.Fatalf("expected 0::decimal(19.9) pg value %s match, found %s", g.String(), zeroD.String())
    89  	}
    90  }