Add Sync options to ignore constrains and indices (#2320)

needed for https://github.com/woodpecker-ci/woodpecker/pull/2117

Reviewed-on: https://gitea.com/xorm/xorm/pulls/2320
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: 6543 <6543@obermui.de>
Co-committed-by: 6543 <6543@obermui.de>

interface.go

@@ -121,6 +121,7 @@ type EngineInterface interface {
 	ShowSQL(show ...bool)
 	Sync(...interface{}) error
 	Sync2(...interface{}) error
+	SyncWithOptions(SyncOptions, ...interface{}) (*SyncResult, error)
 	StoreEngine(storeEngine string) *Session
 	TableInfo(bean interface{}) (*schemas.Table, error)
 	TableName(interface{}, ...bool) string

sync.go

@@ -13,6 +13,10 @@ import (
 
 type SyncOptions struct {
 	WarnIfDatabaseColumnMissed bool
+	// IgnoreConstrains will not add, delete or update unique constrains
+	IgnoreConstrains bool
+	// IgnoreIndices will not add or delete indices
+	IgnoreIndices bool
 }
 
 type SyncResult struct{}
@@ -49,6 +53,8 @@ func (session *Session) Sync2(beans ...interface{}) error {
 func (session *Session) Sync(beans ...interface{}) error {
 	_, err := session.SyncWithOptions(SyncOptions{
 		WarnIfDatabaseColumnMissed: false,
+		IgnoreConstrains:           false,
+		IgnoreIndices:              false,
 	}, beans...)
 	return err
 }
@@ -103,15 +109,20 @@ func (session *Session) SyncWithOptions(opts SyncOptions, beans ...interface{})
 				return nil, err
 			}
 
+			if !opts.IgnoreConstrains {
 				err = session.createUniques(bean)
 				if err != nil {
 					return nil, err
 				}
+			}
 
+			if !opts.IgnoreIndices {
 				err = session.createIndexes(bean)
 				if err != nil {
 					return nil, err
 				}
+			}
+
 			continue
 		}
 
@@ -208,9 +219,12 @@ func (session *Session) SyncWithOptions(opts SyncOptions, beans ...interface{})
 			}
 		}
 
+		// indices found in orig table
 		foundIndexNames := make(map[string]bool)
+		// indices to be added
 		addedNames := make(map[string]*schemas.Index)
 
+		// drop indices that exist in orig and new table schema but are not equal
 		for name, index := range table.Indexes {
 			var oriIndex *schemas.Index
 			for name2, index2 := range oriTable.Indexes {
@@ -221,8 +235,7 @@ func (session *Session) SyncWithOptions(opts SyncOptions, beans ...interface{})
 				}
 			}
 
-			if oriIndex != nil {
-				if oriIndex.Type != index.Type {
+			if oriIndex != nil && oriIndex.Type != index.Type {
 				sql := engine.dialect.DropIndexSQL(tbNameWithSchema, oriIndex)
 				_, err = session.exec(sql)
 				if err != nil {
@@ -230,15 +243,23 @@ func (session *Session) SyncWithOptions(opts SyncOptions, beans ...interface{})
 				}
 				oriIndex = nil
 			}
-			}
 
 			if oriIndex == nil {
 				addedNames[name] = index
 			}
 		}
 
+		// drop all indices that do not exist in new schema or have changed
 		for name2, index2 := range oriTable.Indexes {
 			if _, ok := foundIndexNames[name2]; !ok {
+				// ignore based on there type
+				if (index2.Type == schemas.IndexType && opts.IgnoreIndices) ||
+					(index2.Type == schemas.UniqueType && opts.IgnoreConstrains) {
+					// make sure we do not add a index with same name later
+					delete(addedNames, name2)
+					continue
+				}
+
 				sql := engine.dialect.DropIndexSQL(tbNameWithSchema, index2)
 				_, err = session.exec(sql)
 				if err != nil {
@@ -247,12 +268,13 @@ func (session *Session) SyncWithOptions(opts SyncOptions, beans ...interface{})
 			}
 		}
 
+		// Add new indices because either they did not exist before or were dropped to update them
 		for name, index := range addedNames {
-			if index.Type == schemas.UniqueType {
+			if index.Type == schemas.UniqueType && !opts.IgnoreConstrains {
 				session.statement.RefTable = table
 				session.statement.SetTableName(tbNameWithSchema)
 				err = session.addUnique(tbNameWithSchema, name)
-			} else if index.Type == schemas.IndexType {
+			} else if index.Type == schemas.IndexType && !opts.IgnoreIndices {
 				session.statement.RefTable = table
 				session.statement.SetTableName(tbNameWithSchema)
 				err = session.addIndex(tbNameWithSchema, name)

tests/schema_test.go

@@ -12,6 +12,7 @@ import (
 	"time"
 
 	"github.com/stretchr/testify/assert"
+	"xorm.io/xorm"
 	"xorm.io/xorm/schemas"
 )
 
@@ -645,3 +646,101 @@ func TestCollate(t *testing.T) {
 	})
 	assert.NoError(t, err)
 }
+
+type SyncWithOpts1 struct {
+	Id        int64
+	Index     int `xorm:"index"`
+	Unique    int `xorm:"unique"`
+	Group1    int `xorm:"index(ttt)"`
+	Group2    int `xorm:"index(ttt)"`
+	UniGroup1 int `xorm:"unique(lll)"`
+	UniGroup2 int `xorm:"unique(lll)"`
+}
+
+func (*SyncWithOpts1) TableName() string {
+	return "sync_with_opts"
+}
+
+type SyncWithOpts2 struct {
+	Id        int64
+	Index     int `xorm:"index"`
+	Unique    int `xorm:""`
+	Group1    int `xorm:"index(ttt)"`
+	Group2    int `xorm:"index(ttt)"`
+	UniGroup1 int `xorm:""`
+	UniGroup2 int `xorm:"unique(lll)"`
+}
+
+func (*SyncWithOpts2) TableName() string {
+	return "sync_with_opts"
+}
+
+type SyncWithOpts3 struct {
+	Id        int64
+	Index     int `xorm:""`
+	Unique    int `xorm:"unique"`
+	Group1    int `xorm:""`
+	Group2    int `xorm:"index(ttt)"`
+	UniGroup1 int `xorm:"unique(lll)"`
+	UniGroup2 int `xorm:"unique(lll)"`
+}
+
+func (*SyncWithOpts3) TableName() string {
+	return "sync_with_opts"
+}
+
+func TestSyncWithOptions(t *testing.T) {
+	assert.NoError(t, PrepareEngine())
+
+	// ignore indices and constrains
+	result, err := testEngine.SyncWithOptions(xorm.SyncOptions{IgnoreIndices: true, IgnoreConstrains: true}, &SyncWithOpts1{})
+	assert.NoError(t, err)
+	assert.NotNil(t, result)
+	assert.Len(t, getIndicesOfBeanFromDB(t, &SyncWithOpts1{}), 0)
+
+	// only ignore indices
+	result, err = testEngine.SyncWithOptions(xorm.SyncOptions{IgnoreConstrains: true}, &SyncWithOpts2{})
+	assert.NoError(t, err)
+	assert.NotNil(t, result)
+	indices := getIndicesOfBeanFromDB(t, &SyncWithOpts1{})
+	assert.Len(t, indices, 2)
+	assert.ElementsMatch(t, []string{"ttt", "index"}, getKeysFromMap(indices))
+
+	// only ignore constrains
+	result, err = testEngine.SyncWithOptions(xorm.SyncOptions{IgnoreIndices: true}, &SyncWithOpts3{})
+	assert.NoError(t, err)
+	assert.NotNil(t, result)
+	indices = getIndicesOfBeanFromDB(t, &SyncWithOpts1{})
+	assert.Len(t, indices, 4)
+	assert.ElementsMatch(t, []string{"ttt", "index", "unique", "lll"}, getKeysFromMap(indices))
+
+	tableInfoFromStruct, _ := testEngine.TableInfo(&SyncWithOpts1{})
+	assert.ElementsMatch(t, getKeysFromMap(tableInfoFromStruct.Indexes), getKeysFromMap(getIndicesOfBeanFromDB(t, &SyncWithOpts1{})))
+
+}
+
+func getIndicesOfBeanFromDB(t *testing.T, bean interface{}) map[string]*schemas.Index {
+	dbm, err := testEngine.DBMetas()
+	assert.NoError(t, err)
+
+	tName := testEngine.TableName(bean)
+	var tSchema *schemas.Table
+	for _, t := range dbm {
+		if t.Name == tName {
+			tSchema = t
+			break
+		}
+	}
+	if !assert.NotNil(t, tSchema) {
+		return nil
+	}
+	return tSchema.Indexes
+}
+
+func getKeysFromMap(m map[string]*schemas.Index) []string {
+	var ss []string
+	for k := range m {
+		ss = append(ss, k)
+	}
+	return ss
+}