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foreign_key_test.go
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// Copyright 2016 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package ddl_test
import (
"context"
"fmt"
"strings"
"sync"
"testing"
"time"
"github.com/pingcap/errors"
"github.com/pingcap/tidb/ddl"
"github.com/pingcap/tidb/domain"
"github.com/pingcap/tidb/infoschema"
"github.com/pingcap/tidb/meta"
"github.com/pingcap/tidb/parser/auth"
"github.com/pingcap/tidb/parser/model"
"github.com/pingcap/tidb/sessionctx"
"github.com/pingcap/tidb/sessiontxn"
"github.com/pingcap/tidb/table"
"github.com/pingcap/tidb/testkit"
"github.com/stretchr/testify/require"
)
func testCreateForeignKey(t *testing.T, d ddl.DDL, ctx sessionctx.Context, dbInfo *model.DBInfo, tblInfo *model.TableInfo, fkName string, keys []string, refTable string, refKeys []string, onDelete model.ReferOptionType, onUpdate model.ReferOptionType) *model.Job {
FKName := model.NewCIStr(fkName)
Keys := make([]model.CIStr, len(keys))
for i, key := range keys {
Keys[i] = model.NewCIStr(key)
}
RefTable := model.NewCIStr(refTable)
RefKeys := make([]model.CIStr, len(refKeys))
for i, key := range refKeys {
RefKeys[i] = model.NewCIStr(key)
}
fkInfo := &model.FKInfo{
Name: FKName,
RefTable: RefTable,
RefCols: RefKeys,
Cols: Keys,
OnDelete: int(onDelete),
OnUpdate: int(onUpdate),
State: model.StateNone,
}
job := &model.Job{
SchemaID: dbInfo.ID,
TableID: tblInfo.ID,
Type: model.ActionAddForeignKey,
BinlogInfo: &model.HistoryInfo{},
Args: []interface{}{fkInfo},
}
err := sessiontxn.NewTxn(context.Background(), ctx)
require.NoError(t, err)
ctx.SetValue(sessionctx.QueryString, "skip")
err = d.DoDDLJob(ctx, job)
require.NoError(t, err)
return job
}
func testDropForeignKey(t *testing.T, ctx sessionctx.Context, d ddl.DDL, dbInfo *model.DBInfo, tblInfo *model.TableInfo, foreignKeyName string) *model.Job {
job := &model.Job{
SchemaID: dbInfo.ID,
TableID: tblInfo.ID,
Type: model.ActionDropForeignKey,
BinlogInfo: &model.HistoryInfo{},
Args: []interface{}{model.NewCIStr(foreignKeyName)},
}
ctx.SetValue(sessionctx.QueryString, "skip")
err := d.DoDDLJob(ctx, job)
require.NoError(t, err)
v := getSchemaVer(t, ctx)
checkHistoryJobArgs(t, ctx, job.ID, &historyJobArgs{ver: v, tbl: tblInfo})
return job
}
func getForeignKey(t table.Table, name string) *model.FKInfo {
for _, fk := range t.Meta().ForeignKeys {
// only public foreign key can be read.
if fk.State != model.StatePublic {
continue
}
if fk.Name.L == strings.ToLower(name) {
return fk
}
}
return nil
}
func TestForeignKey(t *testing.T) {
store, dom := testkit.CreateMockStoreAndDomainWithSchemaLease(t, testLease)
d := dom.DDL()
dbInfo, err := testSchemaInfo(store, "test_foreign")
require.NoError(t, err)
testCreateSchema(t, testkit.NewTestKit(t, store).Session(), dom.DDL(), dbInfo)
tblInfo, err := testTableInfo(store, "t", 3)
require.NoError(t, err)
testCreateTable(t, testkit.NewTestKit(t, store).Session(), d, dbInfo, tblInfo)
// fix data race
var mu sync.Mutex
checkOK := false
var hookErr error
tc := &ddl.TestDDLCallback{}
onJobUpdatedExportedFunc := func(job *model.Job) {
if job.State != model.JobStateDone {
return
}
mu.Lock()
defer mu.Unlock()
var t table.Table
t, err = testGetTableWithError(store, dbInfo.ID, tblInfo.ID)
if err != nil {
hookErr = errors.Trace(err)
return
}
fk := getForeignKey(t, "c1_fk")
if fk == nil {
hookErr = errors.New("foreign key not exists")
return
}
checkOK = true
}
tc.OnJobUpdatedExported.Store(&onJobUpdatedExportedFunc)
originalHook := d.GetHook()
defer d.SetHook(originalHook)
d.SetHook(tc)
ctx := testkit.NewTestKit(t, store).Session()
job := testCreateForeignKey(t, d, ctx, dbInfo, tblInfo, "c1_fk", []string{"c1"}, "t2", []string{"c1"}, model.ReferOptionCascade, model.ReferOptionSetNull)
testCheckJobDone(t, store, job.ID, true)
require.NoError(t, err)
mu.Lock()
hErr := hookErr
ok := checkOK
mu.Unlock()
require.NoError(t, hErr)
require.True(t, ok)
v := getSchemaVer(t, ctx)
checkHistoryJobArgs(t, ctx, job.ID, &historyJobArgs{ver: v, tbl: tblInfo})
mu.Lock()
checkOK = false
mu.Unlock()
// fix data race pr/#9491
tc2 := &ddl.TestDDLCallback{}
onJobUpdatedExportedFunc2 := func(job *model.Job) {
if job.State != model.JobStateDone {
return
}
mu.Lock()
defer mu.Unlock()
var t table.Table
t, err = testGetTableWithError(store, dbInfo.ID, tblInfo.ID)
if err != nil {
hookErr = errors.Trace(err)
return
}
fk := getForeignKey(t, "c1_fk")
if fk != nil {
hookErr = errors.New("foreign key has not been dropped")
return
}
checkOK = true
}
tc2.OnJobUpdatedExported.Store(&onJobUpdatedExportedFunc2)
d.SetHook(tc2)
job = testDropForeignKey(t, ctx, d, dbInfo, tblInfo, "c1_fk")
testCheckJobDone(t, store, job.ID, false)
mu.Lock()
hErr = hookErr
ok = checkOK
mu.Unlock()
require.NoError(t, hErr)
require.True(t, ok)
d.SetHook(originalHook)
tk := testkit.NewTestKit(t, store)
jobID := testDropTable(tk, t, dbInfo.Name.L, tblInfo.Name.L, dom)
testCheckJobDone(t, store, jobID, false)
require.NoError(t, err)
}
func TestCreateTableWithForeignKeyMetaInfo(t *testing.T) {
store, dom := testkit.CreateMockStoreAndDomain(t)
tk := testkit.NewTestKit(t, store)
tk.MustExec("set @@global.tidb_enable_foreign_key=1")
tk.MustExec("use test")
tk.MustExec("create table t1 (id int key, a int,b int as (a) virtual);")
tk.MustExec("create database test2")
tk.MustExec("use test2")
tk.MustExec("create table t2 (id int key, b int, foreign key fk_b(b) references test.t1(id) ON UPDATE RESTRICT ON DELETE CASCADE)")
tb1Info := getTableInfo(t, dom, "test", "t1")
tb2Info := getTableInfo(t, dom, "test2", "t2")
require.Equal(t, 1, len(dom.InfoSchema().GetTableReferredForeignKeys("test", "t1")))
require.Equal(t, 0, len(dom.InfoSchema().GetTableReferredForeignKeys("test2", "t2")))
require.Equal(t, 0, len(tb1Info.ForeignKeys))
tb1ReferredFKs := getTableInfoReferredForeignKeys(t, dom, "test", "t1")
require.Equal(t, 1, len(tb1ReferredFKs))
require.Equal(t, model.ReferredFKInfo{
Cols: []model.CIStr{model.NewCIStr("id")},
ChildSchema: model.NewCIStr("test2"),
ChildTable: model.NewCIStr("t2"),
ChildFKName: model.NewCIStr("fk_b"),
}, *tb1ReferredFKs[0])
tb2ReferredFKs := getTableInfoReferredForeignKeys(t, dom, "test2", "t2")
require.Equal(t, 0, len(tb2ReferredFKs))
require.Equal(t, 1, len(tb2Info.ForeignKeys))
require.Equal(t, model.FKInfo{
ID: 1,
Name: model.NewCIStr("fk_b"),
RefSchema: model.NewCIStr("test"),
RefTable: model.NewCIStr("t1"),
RefCols: []model.CIStr{model.NewCIStr("id")},
Cols: []model.CIStr{model.NewCIStr("b")},
OnDelete: 2,
OnUpdate: 1,
State: model.StatePublic,
Version: 1,
}, *tb2Info.ForeignKeys[0])
// Auto create index for foreign key usage.
require.Equal(t, 1, len(tb2Info.Indices))
require.Equal(t, "fk_b", tb2Info.Indices[0].Name.L)
require.Equal(t, "`test2`.`t2`, CONSTRAINT `fk_b` FOREIGN KEY (`b`) REFERENCES `test`.`t1` (`id`) ON DELETE CASCADE ON UPDATE RESTRICT", tb2Info.ForeignKeys[0].String("test2", "t2"))
tk.MustExec("create table t3 (id int, b int, index idx_b(b), foreign key fk_b(b) references t2(id) ON UPDATE SET NULL ON DELETE NO ACTION)")
tb2Info = getTableInfo(t, dom, "test2", "t2")
tb3Info := getTableInfo(t, dom, "test2", "t3")
require.Equal(t, 1, len(dom.InfoSchema().GetTableReferredForeignKeys("test2", "t2")))
require.Equal(t, 0, len(dom.InfoSchema().GetTableReferredForeignKeys("test2", "t3")))
require.Equal(t, 1, len(tb2Info.ForeignKeys))
tb2ReferredFKs = getTableInfoReferredForeignKeys(t, dom, "test2", "t2")
require.Equal(t, 1, len(tb2ReferredFKs))
require.Equal(t, model.ReferredFKInfo{
Cols: []model.CIStr{model.NewCIStr("id")},
ChildSchema: model.NewCIStr("test2"),
ChildTable: model.NewCIStr("t3"),
ChildFKName: model.NewCIStr("fk_b"),
}, *tb2ReferredFKs[0])
tb3ReferredFKs := getTableInfoReferredForeignKeys(t, dom, "test2", "t3")
require.Equal(t, 0, len(tb3ReferredFKs))
require.Equal(t, 1, len(tb3Info.ForeignKeys))
require.Equal(t, model.FKInfo{
ID: 1,
Name: model.NewCIStr("fk_b"),
RefSchema: model.NewCIStr("test2"),
RefTable: model.NewCIStr("t2"),
RefCols: []model.CIStr{model.NewCIStr("id")},
Cols: []model.CIStr{model.NewCIStr("b")},
OnDelete: 4,
OnUpdate: 3,
State: model.StatePublic,
Version: 1,
}, *tb3Info.ForeignKeys[0])
require.Equal(t, 1, len(tb3Info.Indices))
require.Equal(t, "idx_b", tb3Info.Indices[0].Name.L)
require.Equal(t, "`test2`.`t3`, CONSTRAINT `fk_b` FOREIGN KEY (`b`) REFERENCES `t2` (`id`) ON DELETE NO ACTION ON UPDATE SET NULL", tb3Info.ForeignKeys[0].String("test2", "t3"))
tk.MustExec("create table t5 (id int key, a int, b int, foreign key (a) references t5(id));")
tb5Info := getTableInfo(t, dom, "test2", "t5")
require.Equal(t, 1, len(dom.InfoSchema().GetTableReferredForeignKeys("test2", "t5")))
require.Equal(t, 1, len(tb5Info.ForeignKeys))
tb5ReferredFKs := getTableInfoReferredForeignKeys(t, dom, "test2", "t5")
require.Equal(t, 1, len(tb5ReferredFKs))
require.Equal(t, model.ReferredFKInfo{
Cols: []model.CIStr{model.NewCIStr("id")},
ChildSchema: model.NewCIStr("test2"),
ChildTable: model.NewCIStr("t5"),
ChildFKName: model.NewCIStr("fk_1"),
}, *tb5ReferredFKs[0])
require.Equal(t, model.FKInfo{
ID: 1,
Name: model.NewCIStr("fk_1"),
RefSchema: model.NewCIStr("test2"),
RefTable: model.NewCIStr("t5"),
RefCols: []model.CIStr{model.NewCIStr("id")},
Cols: []model.CIStr{model.NewCIStr("a")},
State: model.StatePublic,
Version: 1,
}, *tb5Info.ForeignKeys[0])
require.Equal(t, 1, len(tb5Info.Indices))
require.Equal(t, "fk_1", tb5Info.Indices[0].Name.L)
require.Equal(t, 1, len(dom.InfoSchema().GetTableReferredForeignKeys("test", "t1")))
require.Equal(t, 1, len(dom.InfoSchema().GetTableReferredForeignKeys("test2", "t2")))
require.Equal(t, 0, len(dom.InfoSchema().GetTableReferredForeignKeys("test2", "t3")))
require.Equal(t, 1, len(dom.InfoSchema().GetTableReferredForeignKeys("test2", "t5")))
tk.MustExec("set @@global.tidb_enable_foreign_key=0")
tk.MustExec("drop database test2")
require.Equal(t, 0, len(dom.InfoSchema().GetTableReferredForeignKeys("test2", "t2")))
require.Equal(t, 0, len(dom.InfoSchema().GetTableReferredForeignKeys("test2", "t3")))
require.Equal(t, 0, len(dom.InfoSchema().GetTableReferredForeignKeys("test2", "t5")))
}
func TestCreateTableWithForeignKeyMetaInfo2(t *testing.T) {
store, dom := testkit.CreateMockStoreAndDomain(t)
tk := testkit.NewTestKit(t, store)
tk.MustExec("set @@global.tidb_enable_foreign_key=1")
tk.MustExec("create database test2")
tk.MustExec("set @@foreign_key_checks=0")
tk.MustExec("use test2")
tk.MustExec("create table t2 (id int key, b int, foreign key fk_b(b) references test.t1(id) ON UPDATE RESTRICT ON DELETE CASCADE)")
tk.MustExec("use test")
tk.MustExec("create table t1 (id int key, a int, b int as (a) virtual);")
tb1Info := getTableInfo(t, dom, "test", "t1")
tb2Info := getTableInfo(t, dom, "test2", "t2")
require.Equal(t, 0, len(tb1Info.ForeignKeys))
tb1ReferredFKs := getTableInfoReferredForeignKeys(t, dom, "test", "t1")
require.Equal(t, 1, len(tb1ReferredFKs))
require.Equal(t, model.ReferredFKInfo{
Cols: []model.CIStr{model.NewCIStr("id")},
ChildSchema: model.NewCIStr("test2"),
ChildTable: model.NewCIStr("t2"),
ChildFKName: model.NewCIStr("fk_b"),
}, *tb1ReferredFKs[0])
tb2ReferredFKs := getTableInfoReferredForeignKeys(t, dom, "test2", "t2")
require.Equal(t, 0, len(tb2ReferredFKs))
require.Equal(t, 1, len(tb2Info.ForeignKeys))
require.Equal(t, model.FKInfo{
ID: 1,
Name: model.NewCIStr("fk_b"),
RefSchema: model.NewCIStr("test"),
RefTable: model.NewCIStr("t1"),
RefCols: []model.CIStr{model.NewCIStr("id")},
Cols: []model.CIStr{model.NewCIStr("b")},
OnDelete: 2,
OnUpdate: 1,
State: model.StatePublic,
Version: 1,
}, *tb2Info.ForeignKeys[0])
// Auto create index for foreign key usage.
require.Equal(t, 1, len(tb2Info.Indices))
require.Equal(t, "fk_b", tb2Info.Indices[0].Name.L)
require.Equal(t, "`test2`.`t2`, CONSTRAINT `fk_b` FOREIGN KEY (`b`) REFERENCES `test`.`t1` (`id`) ON DELETE CASCADE ON UPDATE RESTRICT", tb2Info.ForeignKeys[0].String("test2", "t2"))
tk.MustExec("create table t3 (id int key, a int, foreign key fk_a(a) references test.t1(id) ON DELETE CASCADE ON UPDATE RESTRICT, foreign key fk_a2(a) references test2.t2(id))")
tb1Info = getTableInfo(t, dom, "test", "t1")
tb3Info := getTableInfo(t, dom, "test", "t3")
require.Equal(t, 0, len(tb1Info.ForeignKeys))
tb1ReferredFKs = getTableInfoReferredForeignKeys(t, dom, "test", "t1")
require.Equal(t, 2, len(tb1ReferredFKs))
require.Equal(t, model.ReferredFKInfo{
Cols: []model.CIStr{model.NewCIStr("id")},
ChildSchema: model.NewCIStr("test"),
ChildTable: model.NewCIStr("t3"),
ChildFKName: model.NewCIStr("fk_a"),
}, *tb1ReferredFKs[0])
require.Equal(t, model.ReferredFKInfo{
Cols: []model.CIStr{model.NewCIStr("id")},
ChildSchema: model.NewCIStr("test2"),
ChildTable: model.NewCIStr("t2"),
ChildFKName: model.NewCIStr("fk_b"),
}, *tb1ReferredFKs[1])
tb3ReferredFKs := getTableInfoReferredForeignKeys(t, dom, "test", "t3")
require.Equal(t, 0, len(tb3ReferredFKs))
require.Equal(t, 2, len(tb3Info.ForeignKeys))
require.Equal(t, model.FKInfo{
ID: 1,
Name: model.NewCIStr("fk_a"),
RefSchema: model.NewCIStr("test"),
RefTable: model.NewCIStr("t1"),
RefCols: []model.CIStr{model.NewCIStr("id")},
Cols: []model.CIStr{model.NewCIStr("a")},
OnDelete: 2,
OnUpdate: 1,
State: model.StatePublic,
Version: 1,
}, *tb3Info.ForeignKeys[0])
require.Equal(t, model.FKInfo{
ID: 2,
Name: model.NewCIStr("fk_a2"),
RefSchema: model.NewCIStr("test2"),
RefTable: model.NewCIStr("t2"),
RefCols: []model.CIStr{model.NewCIStr("id")},
Cols: []model.CIStr{model.NewCIStr("a")},
State: model.StatePublic,
Version: 1,
}, *tb3Info.ForeignKeys[1])
// Auto create index for foreign key usage.
require.Equal(t, 1, len(tb3Info.Indices))
require.Equal(t, "fk_a", tb3Info.Indices[0].Name.L)
require.Equal(t, "`test`.`t3`, CONSTRAINT `fk_a` FOREIGN KEY (`a`) REFERENCES `t1` (`id`) ON DELETE CASCADE ON UPDATE RESTRICT", tb3Info.ForeignKeys[0].String("test", "t3"))
require.Equal(t, "`test`.`t3`, CONSTRAINT `fk_a2` FOREIGN KEY (`a`) REFERENCES `test2`.`t2` (`id`)", tb3Info.ForeignKeys[1].String("test", "t3"))
tk.MustExec("set @@foreign_key_checks=0")
tk.MustExec("drop table test2.t2")
tb1Info = getTableInfo(t, dom, "test", "t1")
tb3Info = getTableInfo(t, dom, "test", "t3")
require.Equal(t, 0, len(tb1Info.ForeignKeys))
tb1ReferredFKs = getTableInfoReferredForeignKeys(t, dom, "test", "t1")
require.Equal(t, 1, len(tb1ReferredFKs))
require.Equal(t, model.ReferredFKInfo{
Cols: []model.CIStr{model.NewCIStr("id")},
ChildSchema: model.NewCIStr("test"),
ChildTable: model.NewCIStr("t3"),
ChildFKName: model.NewCIStr("fk_a"),
}, *tb1ReferredFKs[0])
tb3ReferredFKs = getTableInfoReferredForeignKeys(t, dom, "test", "t3")
require.Equal(t, 0, len(tb3ReferredFKs))
require.Equal(t, 2, len(tb3Info.ForeignKeys))
require.Equal(t, model.FKInfo{
ID: 1,
Name: model.NewCIStr("fk_a"),
RefSchema: model.NewCIStr("test"),
RefTable: model.NewCIStr("t1"),
RefCols: []model.CIStr{model.NewCIStr("id")},
Cols: []model.CIStr{model.NewCIStr("a")},
OnDelete: 2,
OnUpdate: 1,
State: model.StatePublic,
Version: 1,
}, *tb3Info.ForeignKeys[0])
require.Equal(t, model.FKInfo{
ID: 2,
Name: model.NewCIStr("fk_a2"),
RefSchema: model.NewCIStr("test2"),
RefTable: model.NewCIStr("t2"),
RefCols: []model.CIStr{model.NewCIStr("id")},
Cols: []model.CIStr{model.NewCIStr("a")},
State: model.StatePublic,
Version: 1,
}, *tb3Info.ForeignKeys[1])
}
func TestCreateTableWithForeignKeyMetaInfo3(t *testing.T) {
store, dom := testkit.CreateMockStoreAndDomain(t)
tk := testkit.NewTestKit(t, store)
tk.MustExec("set @@global.tidb_enable_foreign_key=1")
tk.MustExec("set @@foreign_key_checks=1")
tk.MustExec("use test")
tk.MustExec("create table t1 (id int key, a int, b int as (a) virtual);")
tk.MustExec("create table t2 (id int key, b int, foreign key fk_b(b) references test.t1(id))")
tk.MustExec("create table t3 (id int key, b int, foreign key fk_b(b) references test.t1(id))")
tk.MustExec("create table t4 (id int key, b int, foreign key fk_b(b) references test.t1(id))")
tb1ReferredFKs := getTableInfoReferredForeignKeys(t, dom, "test", "t1")
tk.MustExec("drop table t3")
tk.MustExec("create table t5 (id int key, b int, foreign key fk_b(b) references test.t1(id))")
require.Equal(t, 3, len(tb1ReferredFKs))
require.Equal(t, "t2", tb1ReferredFKs[0].ChildTable.L)
require.Equal(t, "t3", tb1ReferredFKs[1].ChildTable.L)
require.Equal(t, "t4", tb1ReferredFKs[2].ChildTable.L)
}
func TestCreateTableWithForeignKeyPrivilegeCheck(t *testing.T) {
store, _ := testkit.CreateMockStoreAndDomain(t)
tk := testkit.NewTestKit(t, store)
tk.MustExec("use test")
tk.MustExec("create user 'u1'@'%' identified by '';")
tk.MustExec("grant create on *.* to 'u1'@'%';")
tk.MustExec("create table t1 (id int key);")
tk2 := testkit.NewTestKit(t, store)
tk2.MustExec("use test")
tk2.Session().Auth(&auth.UserIdentity{Username: "u1", Hostname: "localhost", CurrentUser: true, AuthUsername: "u1", AuthHostname: "%"}, nil, []byte("012345678901234567890"))
err := tk2.ExecToErr("create table t2 (a int, foreign key fk(a) references t1(id));")
require.Error(t, err)
require.Equal(t, "[planner:1142]REFERENCES command denied to user 'u1'@'%' for table 't1'", err.Error())
tk.MustExec("grant references on test.t1 to 'u1'@'%';")
tk2.MustExec("create table t2 (a int, foreign key fk(a) references t1(id));")
tk2.MustExec("create table t3 (id int key)")
err = tk2.ExecToErr("create table t4 (a int, foreign key fk(a) references t1(id), foreign key (a) references t3(id));")
require.Error(t, err)
require.Equal(t, "[planner:1142]REFERENCES command denied to user 'u1'@'%' for table 't3'", err.Error())
tk.MustExec("grant references on test.t3 to 'u1'@'%';")
tk2.MustExec("create table t4 (a int, foreign key fk(a) references t1(id), foreign key (a) references t3(id));")
}
func TestRenameTableWithForeignKeyMetaInfo(t *testing.T) {
store, dom := testkit.CreateMockStoreAndDomain(t)
tk := testkit.NewTestKit(t, store)
tk.MustExec("set @@global.tidb_enable_foreign_key=1")
tk.MustExec("create database test2")
tk.MustExec("create database test3")
tk.MustExec("use test")
tk.MustExec("create table t1 (id int key, a int, b int, foreign key fk(a) references t1(id))")
tk.MustExec("rename table test.t1 to test2.t2")
// check the schema diff
diff := getLatestSchemaDiff(t, tk)
require.Equal(t, model.ActionRenameTable, diff.Type)
require.Equal(t, 0, len(diff.AffectedOpts))
tk.MustQuery("show create table test2.t2").Check(testkit.Rows("t2 CREATE TABLE `t2` (\n" +
" `id` int(11) NOT NULL,\n" +
" `a` int(11) DEFAULT NULL,\n" +
" `b` int(11) DEFAULT NULL,\n" +
" PRIMARY KEY (`id`) /*T![clustered_index] CLUSTERED */,\n" +
" KEY `fk` (`a`),\n" +
" CONSTRAINT `fk` FOREIGN KEY (`a`) REFERENCES `test2`.`t2` (`id`)\n" +
") ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin"))
tblInfo := getTableInfo(t, dom, "test2", "t2")
tbReferredFKs := getTableInfoReferredForeignKeys(t, dom, "test2", "t2")
require.Equal(t, 1, len(tblInfo.ForeignKeys))
require.Equal(t, 1, len(tbReferredFKs))
require.Equal(t, model.ReferredFKInfo{
Cols: []model.CIStr{model.NewCIStr("id")},
ChildSchema: model.NewCIStr("test2"),
ChildTable: model.NewCIStr("t2"),
ChildFKName: model.NewCIStr("fk"),
}, *tbReferredFKs[0])
require.Equal(t, model.FKInfo{
ID: 1,
Name: model.NewCIStr("fk"),
RefSchema: model.NewCIStr("test2"),
RefTable: model.NewCIStr("t2"),
RefCols: []model.CIStr{model.NewCIStr("id")},
Cols: []model.CIStr{model.NewCIStr("a")},
State: model.StatePublic,
Version: 1,
}, *tblInfo.ForeignKeys[0])
tk.MustExec("drop table test2.t2")
tk.MustExec("use test")
tk.MustExec("create table t1 (id int key, a int, b int as (a) virtual);")
tk.MustExec("create table t2 (id int key, b int, foreign key fk_b(b) references test.t1(id))")
tk.MustExec("use test2")
tk.MustExec("rename table test.t2 to test2.tt2")
// check the schema diff
diff = getLatestSchemaDiff(t, tk)
require.Equal(t, model.ActionRenameTable, diff.Type)
require.Equal(t, 0, len(diff.AffectedOpts))
tb1Info := getTableInfo(t, dom, "test", "t1")
tb2Info := getTableInfo(t, dom, "test2", "tt2")
require.Equal(t, 0, len(tb1Info.ForeignKeys))
tb1ReferredFKs := getTableInfoReferredForeignKeys(t, dom, "test", "t1")
require.Equal(t, 1, len(tb1ReferredFKs))
require.Equal(t, model.ReferredFKInfo{
Cols: []model.CIStr{model.NewCIStr("id")},
ChildSchema: model.NewCIStr("test2"),
ChildTable: model.NewCIStr("tt2"),
ChildFKName: model.NewCIStr("fk_b"),
}, *tb1ReferredFKs[0])
tb2ReferredFKs := getTableInfoReferredForeignKeys(t, dom, "test2", "tt2")
require.Equal(t, 0, len(tb2ReferredFKs))
require.Equal(t, 1, len(tb2Info.ForeignKeys))
require.Equal(t, model.FKInfo{
ID: 1,
Name: model.NewCIStr("fk_b"),
RefSchema: model.NewCIStr("test"),
RefTable: model.NewCIStr("t1"),
RefCols: []model.CIStr{model.NewCIStr("id")},
Cols: []model.CIStr{model.NewCIStr("b")},
State: model.StatePublic,
Version: 1,
}, *tb2Info.ForeignKeys[0])
// Auto create index for foreign key usage.
require.Equal(t, 1, len(tb2Info.Indices))
require.Equal(t, "fk_b", tb2Info.Indices[0].Name.L)
require.Equal(t, "`test2`.`tt2`, CONSTRAINT `fk_b` FOREIGN KEY (`b`) REFERENCES `test`.`t1` (`id`)", tb2Info.ForeignKeys[0].String("test2", "tt2"))
tk.MustExec("rename table test.t1 to test3.tt1")
tb1ReferredFKs = getTableInfoReferredForeignKeys(t, dom, "test3", "tt1")
require.Equal(t, 1, len(tb1ReferredFKs))
require.Equal(t, 1, len(tb1ReferredFKs[0].Cols))
// check the schema diff
diff = getLatestSchemaDiff(t, tk)
require.Equal(t, model.ActionRenameTable, diff.Type)
require.Equal(t, 1, len(diff.AffectedOpts))
require.Equal(t, model.ReferredFKInfo{
Cols: []model.CIStr{model.NewCIStr("id")},
ChildSchema: model.NewCIStr("test2"),
ChildTable: model.NewCIStr("tt2"),
ChildFKName: model.NewCIStr("fk_b"),
}, *tb1ReferredFKs[0])
tbl2Info := getTableInfo(t, dom, "test2", "tt2")
tb2ReferredFKs = getTableInfoReferredForeignKeys(t, dom, "test2", "tt2")
require.Equal(t, 0, len(tb2ReferredFKs))
require.Equal(t, 1, len(tbl2Info.ForeignKeys))
require.Equal(t, model.FKInfo{
ID: 1,
Name: model.NewCIStr("fk_b"),
RefSchema: model.NewCIStr("test3"),
RefTable: model.NewCIStr("tt1"),
RefCols: []model.CIStr{model.NewCIStr("id")},
Cols: []model.CIStr{model.NewCIStr("b")},
State: model.StatePublic,
Version: 1,
}, *tbl2Info.ForeignKeys[0])
tk.MustQuery("show create table test2.tt2").Check(testkit.Rows("tt2 CREATE TABLE `tt2` (\n" +
" `id` int(11) NOT NULL,\n" +
" `b` int(11) DEFAULT NULL,\n" +
" PRIMARY KEY (`id`) /*T![clustered_index] CLUSTERED */,\n" +
" KEY `fk_b` (`b`),\n" +
" CONSTRAINT `fk_b` FOREIGN KEY (`b`) REFERENCES `test3`.`tt1` (`id`)\n" +
") ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin"))
}
func TestCreateTableWithForeignKeyDML(t *testing.T) {
store, _ := testkit.CreateMockStoreAndDomain(t)
tk := testkit.NewTestKit(t, store)
tk.MustExec("set @@global.tidb_enable_foreign_key=1")
tk.MustExec("use test")
tk.MustExec("create table t1 (id int key, a int);")
tk.MustExec("begin")
tk.MustExec("insert into t1 values (1, 1)")
tk.MustExec("update t1 set a = 2 where id = 1")
tk2 := testkit.NewTestKit(t, store)
tk2.MustExec("use test")
tk2.MustExec("create table t2 (id int key, b int, foreign key fk_b(b) references test.t1(id))")
tk.MustExec("commit")
}
func TestCreateTableWithForeignKeyError(t *testing.T) {
store, _ := testkit.CreateMockStoreAndDomain(t)
tk := testkit.NewTestKit(t, store)
tk.MustExec("set @@global.tidb_enable_foreign_key=1")
tk.MustExec("use test")
cases := []struct {
prepare []string
refer string
create string
err string
}{
{
refer: "create table t1 (id int, a int, b int);",
create: "create table t2 (a int, b int, foreign key fk_b(b) references T_unknown(b));",
err: "[schema:1824]Failed to open the referenced table 'T_unknown'",
},
{
refer: "create table t1 (id int, a int, b int);",
create: "create table t2 (a int, b int, foreign key fk_b(b) references t1(c_unknown));",
err: "[schema:3734]Failed to add the foreign key constraint. Missing column 'c_unknown' for constraint 'fk_b' in the referenced table 't1'",
},
{
refer: "create table t1 (id int key, a int, b int);",
create: "create table t2 (a int, b int, foreign key fk(c_unknown) references t1(id));",
err: "[ddl:1072]Key column 'c_unknown' doesn't exist in table",
},
{
refer: "create table t1 (id int, a int, b int);",
create: "create table t2 (a int, b int, foreign key fk_b(b) references t1(b));",
err: "[schema:1822]Failed to add the foreign key constraint. Missing index for constraint 'fk_b' in the referenced table 't1'",
},
{
refer: "create table t1 (id int, a int, b int not null, index(b));",
create: "create table t2 (a int, b int not null, foreign key fk_b(b) references t1(b) on update set null);",
err: "[schema:1830]Column 'b' cannot be NOT NULL: needed in a foreign key constraint 'fk_b' SET NULL",
},
{
refer: "create table t1 (id int, a int, b int not null, index(b));",
create: "create table t2 (a int, b int not null, foreign key fk_b(b) references t1(b) on delete set null);",
err: "[schema:1830]Column 'b' cannot be NOT NULL: needed in a foreign key constraint 'fk_b' SET NULL",
},
{
refer: "create table t1 (id int key, a int, b int as (a) virtual, index(b));",
create: "create table t2 (a int, b int, foreign key fk_b(b) references t1(b));",
err: "[schema:3733]Foreign key 'fk_b' uses virtual column 'b' which is not supported.",
},
{
refer: "create table t1 (id int key, a int, b int, index(b));",
create: "create table t2 (a int, b int as (a) virtual, foreign key fk_b(b) references t1(b));",
err: "[schema:3733]Foreign key 'fk_b' uses virtual column 'b' which is not supported.",
},
{
refer: "create table t1 (id int key, a int);",
create: "create table t2 (a int, b varchar(10), foreign key fk(b) references t1(id));",
err: "[ddl:3780]Referencing column 'b' and referenced column 'id' in foreign key constraint 'fk' are incompatible.",
},
{
refer: "create table t1 (id int key, a int not null, index(a));",
create: "create table t2 (a int, b int unsigned, foreign key fk_b(b) references t1(a));",
err: "[ddl:3780]Referencing column 'b' and referenced column 'a' in foreign key constraint 'fk_b' are incompatible.",
},
{
refer: "create table t1 (id int key, a bigint, index(a));",
create: "create table t2 (a int, b int, foreign key fk_b(b) references t1(a));",
err: "[ddl:3780]Referencing column 'b' and referenced column 'a' in foreign key constraint 'fk_b' are incompatible.",
},
{
refer: "create table t1 (id int key, a varchar(10) charset utf8, index(a));",
create: "create table t2 (a int, b varchar(10) charset utf8mb4, foreign key fk_b(b) references t1(a));",
err: "[ddl:3780]Referencing column 'b' and referenced column 'a' in foreign key constraint 'fk_b' are incompatible.",
},
{
refer: "create table t1 (id int key, a varchar(10) collate utf8_bin, index(a));",
create: "create table t2 (a int, b varchar(10) collate utf8mb4_bin, foreign key fk_b(b) references t1(a));",
err: "[ddl:3780]Referencing column 'b' and referenced column 'a' in foreign key constraint 'fk_b' are incompatible.",
},
{
refer: "create table t1 (id int key, a varchar(10));",
create: "create table t2 (a int, b varchar(10), foreign key fk_b(b) references t1(a));",
err: "[schema:1822]Failed to add the foreign key constraint. Missing index for constraint 'fk_b' in the referenced table 't1'",
},
{
refer: "create table t1 (id int key, a varchar(10), index (a(5)));",
create: "create table t2 (a int, b varchar(10), foreign key fk_b(b) references t1(a));",
err: "[schema:1822]Failed to add the foreign key constraint. Missing index for constraint 'fk_b' in the referenced table 't1'",
},
{
refer: "create table t1 (id int key, a int, index(a));",
create: "create table t2 (a int, b int, foreign key fk_b(b) references t1(id, a));",
err: "[schema:1239]Incorrect foreign key definition for 'fk_b': Key reference and table reference don't match",
},
{
create: "create table t2 (a int key, foreign key (a) references t2(a));",
err: "[schema:1215]Cannot add foreign key constraint",
},
{
create: "create table t2 (a int, b int, index(a,b), index(b,a), foreign key (a,b) references t2(a,b));",
err: "[schema:1215]Cannot add foreign key constraint",
},
{
create: "create table t2 (a int, b int, index(a,b), foreign key (a,b) references t2(b,a));",
err: "[schema:1822]Failed to add the foreign key constraint. Missing index for constraint 'fk_1' in the referenced table 't2'",
},
{
prepare: []string{
"set @@foreign_key_checks=0;",
"create table t2 (a int, b int, index(a), foreign key (a) references t1(id));",
},
create: "create table t1 (id int, a int);",
err: "[schema:1822]Failed to add the foreign key constraint. Missing index for constraint 'fk_1' in the referenced table 't1'",
},
{
prepare: []string{
"set @@foreign_key_checks=0;",
"create table t2 (a int, b int, index(a), foreign key (a) references t1(id));",
},
create: "create table t1 (id bigint key, a int);",
err: "[ddl:3780]Referencing column 'a' and referenced column 'id' in foreign key constraint 'fk_1' are incompatible.",
},
{
// foreign key is not support in temporary table.
refer: "create temporary table t1 (id int key, b int, index(b))",
create: "create table t2 (a int, b int, foreign key fk(b) references t1(b))",
err: "[schema:1824]Failed to open the referenced table 't1'",
},
{
// foreign key is not support in temporary table.
refer: "create global temporary table t1 (id int key, b int, index(b)) on commit delete rows",
create: "create table t2 (a int, b int, foreign key fk(b) references t1(b))",
err: "[schema:1215]Cannot add foreign key constraint",
},
{
// foreign key is not support in temporary table.
refer: "create table t1 (id int key, b int, index(b))",
create: "create temporary table t2 (a int, b int, foreign key fk(b) references t1(b))",
err: "[schema:1215]Cannot add foreign key constraint",
},
{
// foreign key is not support in temporary table.
refer: "create table t1 (id int key, b int, index(b))",
create: "create global temporary table t2 (a int, b int, foreign key fk(b) references t1(b)) on commit delete rows",
err: "[schema:1215]Cannot add foreign key constraint",
},
{
create: "create table t1 (a int, foreign key ``(a) references t1(a));",
err: "[ddl:1280]Incorrect index name ''",
},
{
create: "create table t1 (a int, constraint `` foreign key (a) references t1(a));",
err: "[ddl:1280]Incorrect index name ''",
},
{
create: "create table t1 (a int, constraint `fk` foreign key (a,a) references t1(a, b));",
err: "[schema:1060]Duplicate column name 'a'",
},
{
refer: "create table t1(a int, b int, index(a,b));",
create: "create table t2 (a int, b int, foreign key (a,b) references t1(a,a));",
err: "[schema:1822]Failed to add the foreign key constraint. Missing index for constraint 'fk_1' in the referenced table 't1'",
},
{
refer: "create table t1 (id int key, b int, index(b))",
create: "create table t2 (a int, b int, index fk_1(a), foreign key (b) references t1(b));",
err: "[ddl:1061]duplicate key name fk_1",
},
}
for _, ca := range cases {
tk.MustExec("drop table if exists t2")
tk.MustExec("drop table if exists t1")
tk.MustExec("set @@foreign_key_checks=1")
for _, sql := range ca.prepare {
tk.MustExec(sql)
}
if ca.refer != "" {
tk.MustExec(ca.refer)
}
err := tk.ExecToErr(ca.create)
require.Error(t, err, ca.create)
require.Equal(t, ca.err, err.Error(), ca.create)
}
passCases := [][]string{
{
"create table t1 (id int key, a int, b int, foreign key fk(a) references t1(id))",
},
{
"create table t1 (id int key, b int not null, index(b))",
"create table t2 (a int, b int, foreign key fk_b(b) references t1(b));",
},
{
"create table t1 (id int key, a varchar(10), index(a));",
"create table t2 (a int, b varchar(20), foreign key fk_b(b) references t1(a));",
},
{
"create table t1 (id int key, a decimal(10,5), index(a));",
"create table t2 (a int, b decimal(20, 10), foreign key fk_b(b) references t1(a));",
},
{
"create table t1 (id int key, a varchar(10), index (a(10)));",
"create table t2 (a int, b varchar(20), foreign key fk_b(b) references t1(a));",
},
{
"set @@foreign_key_checks=0;",
"create table t2 (a int, b int, foreign key fk_b(b) references t_unknown(b));",
"set @@foreign_key_checks=1;",
},
{
"create table t2 (a int, b int, index(a,b), index(b,a), foreign key (a,b) references t2(b,a));",
},
{
"create table t1 (a int key, b int, index(b))",
"create table t2 (a int, b int, foreign key (a) references t1(a), foreign key (b) references t1(b));",
},
}
for _, ca := range passCases {
tk.MustExec("drop table if exists t2")
tk.MustExec("drop table if exists t1")
for _, sql := range ca {
tk.MustExec(sql)
}
}
}
func TestModifyColumnWithForeignKey(t *testing.T) {
store, _ := testkit.CreateMockStoreAndDomain(t)
tk := testkit.NewTestKit(t, store)
tk.MustExec("set @@global.tidb_enable_foreign_key=1")
tk.MustExec("set @@foreign_key_checks=1;")
tk.MustExec("use test")
tk.MustExec("create table t1 (id int key, b varchar(10), index(b));")
tk.MustExec("create table t2 (a varchar(10), constraint fk foreign key (a) references t1(b));")
tk.MustExec("insert into t1 values (1, '123456789');")
tk.MustExec("insert into t2 values ('123456789');")
tk.MustGetErrMsg("alter table t1 modify column b varchar(5);", "[ddl:1833]Cannot change column 'b': used in a foreign key constraint 'fk' of table 'test.t2'")
tk.MustGetErrMsg("alter table t1 modify column b bigint;", "[ddl:3780]Referencing column 'a' and referenced column 'b' in foreign key constraint 'fk' are incompatible.")
tk.MustExec("alter table t1 modify column b varchar(20);")
tk.MustGetErrMsg("alter table t1 modify column b varchar(10);", "[ddl:1833]Cannot change column 'b': used in a foreign key constraint 'fk' of table 'test.t2'")
tk.MustExec("alter table t2 modify column a varchar(20);")
tk.MustExec("alter table t2 modify column a varchar(21);")
tk.MustGetErrMsg("alter table t2 modify column a varchar(5);", "[ddl:1832]Cannot change column 'a': used in a foreign key constraint 'fk'")
tk.MustGetErrMsg("alter table t2 modify column a bigint;", "[ddl:3780]Referencing column 'a' and referenced column 'b' in foreign key constraint 'fk' are incompatible.")
tk.MustExec("drop table t2")
tk.MustExec("drop table t1")
tk.MustExec("create table t1 (id int key, b decimal(10, 5), index(b));")
tk.MustExec("create table t2 (a decimal(10, 5), constraint fk foreign key (a) references t1(b));")
tk.MustExec("insert into t1 values (1, 12345.67891);")
tk.MustExec("insert into t2 values (12345.67891);")
tk.MustGetErrMsg("alter table t1 modify column b decimal(10, 6);", "[ddl:1833]Cannot change column 'b': used in a foreign key constraint 'fk' of table 'test.t2'")
tk.MustGetErrMsg("alter table t1 modify column b decimal(10, 3);", "[ddl:1833]Cannot change column 'b': used in a foreign key constraint 'fk' of table 'test.t2'")
tk.MustGetErrMsg("alter table t1 modify column b decimal(5, 2);", "[ddl:1833]Cannot change column 'b': used in a foreign key constraint 'fk' of table 'test.t2'")
tk.MustGetErrMsg("alter table t1 modify column b decimal(20, 10);", "[ddl:1833]Cannot change column 'b': used in a foreign key constraint 'fk' of table 'test.t2'")
tk.MustGetErrMsg("alter table t2 modify column a decimal(30, 15);", "[ddl:1832]Cannot change column 'a': used in a foreign key constraint 'fk'")
tk.MustGetErrMsg("alter table t2 modify column a decimal(5, 2);", "[ddl:1832]Cannot change column 'a': used in a foreign key constraint 'fk'")
}
func TestDropChildTableForeignKeyMetaInfo(t *testing.T) {
store, dom := testkit.CreateMockStoreAndDomain(t)
tk := testkit.NewTestKit(t, store)
tk.MustExec("set @@global.tidb_enable_foreign_key=1")
tk.MustExec("use test")
tk.MustExec("create table t1 (id int key, a int, b int, CONSTRAINT fk foreign key (a) references t1(id))")
tb1ReferredFKs := getTableInfoReferredForeignKeys(t, dom, "test", "t1")
require.Equal(t, 1, len(tb1ReferredFKs))
tk.MustExec("drop table t1")
tb1ReferredFKs = getTableInfoReferredForeignKeys(t, dom, "test", "t1")
require.Equal(t, 0, len(tb1ReferredFKs))
tk.MustExec("create table t1 (id int key, b int, index(b))")
tk.MustExec("create table t2 (a int, b int, foreign key fk (a) references t1(b));")
tb1ReferredFKs = getTableInfoReferredForeignKeys(t, dom, "test", "t1")
require.Equal(t, 1, len(tb1ReferredFKs))
tk.MustExec("drop table t2")
tb1ReferredFKs = getTableInfoReferredForeignKeys(t, dom, "test", "t1")
require.Equal(t, 0, len(tb1ReferredFKs))
}
func TestDropForeignKeyMetaInfo(t *testing.T) {
store, dom := testkit.CreateMockStoreAndDomain(t)
tk := testkit.NewTestKit(t, store)
tk.MustExec("set @@global.tidb_enable_foreign_key=1")
tk.MustExec("use test")
tk.MustExec("create table t1 (id int key, a int, b int, CONSTRAINT fk foreign key (a) references t1(id))")
tb1ReferredFKs := getTableInfoReferredForeignKeys(t, dom, "test", "t1")
require.Equal(t, 1, len(tb1ReferredFKs))
tk.MustExec("alter table t1 drop foreign key fk")
tbl1Info := getTableInfo(t, dom, "test", "t1")
tb1ReferredFKs = getTableInfoReferredForeignKeys(t, dom, "test", "t1")
require.Equal(t, 0, len(tbl1Info.ForeignKeys))
require.Equal(t, 0, len(tb1ReferredFKs))
tk.MustExec("drop table t1")
tk.MustExec("create table t1 (id int key, b int, index(b))")
tk.MustExec("create table t2 (a int, b int, foreign key fk (a) references t1(b));")
tb1ReferredFKs = getTableInfoReferredForeignKeys(t, dom, "test", "t1")
require.Equal(t, 1, len(tb1ReferredFKs))
tk.MustExec("alter table t2 drop foreign key fk")
tb1ReferredFKs = getTableInfoReferredForeignKeys(t, dom, "test", "t1")
require.Equal(t, 0, len(tb1ReferredFKs))
tbl2Info := getTableInfo(t, dom, "test", "t2")
require.Equal(t, 0, len(tbl2Info.ForeignKeys))
}
func TestTruncateOrDropTableWithForeignKeyReferred(t *testing.T) {
store, _ := testkit.CreateMockStoreAndDomain(t)
tk := testkit.NewTestKit(t, store)
tk.MustExec("set @@global.tidb_enable_foreign_key=1")
tk.MustExec("use test")
cases := []struct {
prepares []string
tbl string
truncateErr string
dropErr string
}{
{
prepares: []string{
"create table t1 (id int key, b int not null, index(b))",
"create table t2 (a int, b int, foreign key fk_b(b) references t1(b));",
},
tbl: "t1",
truncateErr: "[ddl:1701]Cannot truncate a table referenced in a foreign key constraint (`test`.`t2` CONSTRAINT `fk_b`)",
dropErr: "[ddl:3730]Cannot drop table 't1' referenced by a foreign key constraint 'fk_b' on table 't2'.",
},
{
prepares: []string{
"create table t1 (id int key, a varchar(10), index(a));",
"create table t2 (a int, b varchar(20), foreign key fk_b(b) references t1(a));",
},
tbl: "t1",
truncateErr: "[ddl:1701]Cannot truncate a table referenced in a foreign key constraint (`test`.`t2` CONSTRAINT `fk_b`)",
dropErr: "[ddl:3730]Cannot drop table 't1' referenced by a foreign key constraint 'fk_b' on table 't2'.",
},
{
prepares: []string{
"create table t1 (id int key, a varchar(10), index (a(10)));",
"create table t2 (a int, b varchar(20), foreign key fk_b(b) references t1(a));",
},
tbl: "t1",
truncateErr: "[ddl:1701]Cannot truncate a table referenced in a foreign key constraint (`test`.`t2` CONSTRAINT `fk_b`)",
dropErr: "[ddl:3730]Cannot drop table 't1' referenced by a foreign key constraint 'fk_b' on table 't2'.",
},
}
for _, ca := range cases {
tk.MustExec("drop table if exists t2")
tk.MustExec("drop table if exists t1")
for _, sql := range ca.prepares {
tk.MustExec(sql)
}
truncateSQL := fmt.Sprintf("truncate table %v", ca.tbl)
tk.MustExec("set @@foreign_key_checks=1;")
err := tk.ExecToErr(truncateSQL)
require.Error(t, err)
require.Equal(t, ca.truncateErr, err.Error())
dropSQL := fmt.Sprintf("drop table %v", ca.tbl)
err = tk.ExecToErr(dropSQL)
require.Error(t, err)
require.Equal(t, ca.dropErr, err.Error())
tk.MustExec("set @@foreign_key_checks=0;")
tk.MustExec(truncateSQL)
}
passCases := [][]string{
{
"create table t1 (id int key, a int, b int, foreign key fk(a) references t1(id))",
"truncate table t1",
"drop table t1",
},
{
"create table t1 (id int key, a varchar(10), index (a(10)));",
"create table t2 (a int, b varchar(20), foreign key fk_b(b) references t1(a));",
"drop table t1, t2",