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queryx: Added CAS functions (#98)

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Added ExecCAS, ExecCASRelease, GetCAS, GetCASRelease functions
suitable for INSERT ... IF NOT EXISTS and UPDATE's containing IF statement.
Functions returns information wheter query was applied or not, together
with pre-image.

Fixes #98
This commit is contained in:
Maciej Zimnoch
2020-04-20 19:43:32 +02:00
committed by Michal Jan Matczuk
parent 9655ae5b49
commit 52c5f6873a
4 changed files with 164 additions and 3 deletions
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47
example_test.go
View File

@@ -24,6 +24,7 @@ CREATE TABLE IF NOT EXISTS gocqlx_test.person (
first_name text,
last_name text,
email list<text>,
salary int,
PRIMARY KEY(first_name, last_name)
)`
@@ -38,12 +39,14 @@ CREATE TABLE IF NOT EXISTS gocqlx_test.person (
FirstName string
LastName string
Email []string
Salary int
}
p := Person{
"Patricia",
"Citizen",
[]string{"patricia.citzen@gocqlx_test.com"},
500,
}
// Insert, bind data from struct.
@@ -117,11 +120,13 @@ CREATE TABLE IF NOT EXISTS gocqlx_test.person (
"Igy",
"Citizen",
[]string{"igy.citzen@gocqlx_test.com"},
500,
},
B: Person{
"Ian",
"Citizen",
[]string{"ian.citzen@gocqlx_test.com"},
500,
},
}
q := session.Query(stmt, names).BindStruct(&batch)
@@ -171,6 +176,7 @@ CREATE TABLE IF NOT EXISTS gocqlx_test.person (
"Ian",
"Citizen",
[]string{"ian.citzen@gocqlx_test.com"},
500,
}
stmt, names := qb.Select("gocqlx_test.person").
@@ -201,6 +207,7 @@ CREATE TABLE IF NOT EXISTS gocqlx_test.person (
"Jane",
"Citizen",
[]string{"jane.citzen@gocqlx_test.com"},
500,
}
q := session.Query(stmt, names).BindStruct(p)
@@ -208,4 +215,44 @@ CREATE TABLE IF NOT EXISTS gocqlx_test.person (
t.Fatal(err)
}
}
// Support for Lightweight Transactions
{
p := Person{
"Stephen",
"Johns",
[]string{"stephen.johns@gocqlx_test.com"},
500,
}
stmt, names := qb.Insert("gocqlx_test.person").
Columns("first_name", "last_name", "email", "salary").
Unique().
ToCql()
applied, err := session.Query(stmt, names).BindStruct(p).ExecCASRelease()
if err != nil {
t.Fatal(err)
}
t.Log(applied)
stmt, names = qb.Update("gocqlx_test.person").
SetNamed("salary", "new_salary").
Where(qb.Eq("first_name"), qb.Eq("last_name")).
If(qb.LtNamed("salary", "old_salary")).
ToCql()
q := session.Query(stmt, names).BindStructMap(&p, qb.M{
"old_salary": 1000,
"new_salary": 1500,
})
applied, err = q.GetCAS(&p)
if err != nil {
t.Fatal(err)
}
t.Log(applied, p)
}
}