fix(database/gdb): issue where the Count/Value/Array query logic wa…

…s incompatible with the old version when users extended the returned result fields using the `Select` Hook (#3995)

contrib/drivers/mysql/mysql_z_unit_issue_test.go

@@ -13,6 +13,7 @@ import (
 	"testing"
 	"time"
 
+	"github.com/gogf/gf/v2/container/gvar"
 	"github.com/gogf/gf/v2/database/gdb"
 	"github.com/gogf/gf/v2/frame/g"
 	"github.com/gogf/gf/v2/os/gtime"
@@ -1283,12 +1284,12 @@ func Test_Issue3754(t *testing.T) {
 func Test_Issue3626(t *testing.T) {
 	table := "issue3626"
 	array := gstr.SplitAndTrim(gtest.DataContent(`issue3626.sql`), ";")
+	defer dropTable(table)
 	for _, v := range array {
 		if _, err := db.Exec(ctx, v); err != nil {
 			gtest.Error(err)
 		}
 	}
-	defer dropTable(table)
 
 	// Insert.
 	gtest.C(t, func(t *gtest.T) {
@@ -1377,3 +1378,34 @@ func Test_Issue3932(t *testing.T) {
 		t.Assert(one["id"], 10)
 	})
 }
+
+// https://github.com/gogf/gf/issues/3968
+func Test_Issue3968(t *testing.T) {
+	table := createInitTable()
+	defer dropTable(table)
+
+	gtest.C(t, func(t *gtest.T) {
+		var hook = gdb.HookHandler{
+			Select: func(ctx context.Context, in *gdb.HookSelectInput) (result gdb.Result, err error) {
+				result, err = in.Next(ctx)
+				if err != nil {
+					return nil, err
+				}
+				if result != nil {
+					for i, _ := range result {
+						result[i]["location"] = gvar.New("ny")
+					}
+				}
+				return
+			},
+		}
+		var (
+			count  int
+			result gdb.Result
+		)
+		err := db.Model(table).Hook(hook).ScanAndCount(&result, &count, false)
+		t.AssertNil(err)
+		t.Assert(count, 10)
+		t.Assert(len(result), 10)
+	})
+}

database/gdb/gdb.go

@@ -396,12 +396,13 @@ const (
 	linkPattern = `(\w+):([\w\-\$]*):(.*?)@(\w+?)\((.+?)\)/{0,1}([^\?]*)\?{0,1}(.*)`
 )
 
-type queryType int
+type SelectType int
 
 const (
-	queryTypeNormal queryType = iota
-	queryTypeCount
-	queryTypeValue
+	SelectTypeDefault SelectType = iota
+	SelectTypeCount
+	SelectTypeValue
+	SelectTypeArray
 )
 
 type joinOperator string
@@ -700,21 +701,21 @@ func getConfigNodeByWeight(cg ConfigGroup) *ConfigNode {
 	}
 	// Exclude the right border value.
 	var (
-		min    = 0
-		max    = 0
-		random = grand.N(0, total-1)
+		minWeight = 0
+		maxWeight = 0
+		random    = grand.N(0, total-1)
 	)
 	for i := 0; i < len(cg); i++ {
-		max = min + cg[i].Weight*100
-		if random >= min && random < max {
+		maxWeight = minWeight + cg[i].Weight*100
+		if random >= minWeight && random < maxWeight {
 			// ====================================================
 			// Return a COPY of the ConfigNode.
 			// ====================================================
 			node := ConfigNode{}
 			node = cg[i]
 			return &node
 		}
-		min = max
+		minWeight = maxWeight
 	}
 	return nil
 }

database/gdb/gdb_core.go

@@ -278,7 +278,7 @@ func (c *Core) doUnion(ctx context.Context, unionType int, unions ...*Model) *Mo
 		unionTypeStr = "UNION"
 	}
 	for _, v := range unions {
-		sqlWithHolder, holderArgs := v.getFormattedSqlAndArgs(ctx, queryTypeNormal, false)
+		sqlWithHolder, holderArgs := v.getFormattedSqlAndArgs(ctx, SelectTypeDefault, false)
 		if composedSqlStr == "" {
 			composedSqlStr += fmt.Sprintf(`(%s)`, sqlWithHolder)
 		} else {

database/gdb/gdb_core_ctx.go

@@ -23,8 +23,6 @@ type internalCtxData struct {
 }
 
 // column stores column data in ctx for internal usage purpose.
-// Deprecated.
-// TODO remove this usage in future.
 type internalColumnData struct {
 	// The first column in result response from database server.
 	// This attribute is used for Value/Count selection statement purpose,

database/gdb/gdb_model_cache.go

@@ -90,7 +90,7 @@ func (m *Model) getSelectResultFromCache(ctx context.Context, sql string, args .
 }
 
 func (m *Model) saveSelectResultToCache(
-	ctx context.Context, queryType queryType, result Result, sql string, args ...interface{},
+	ctx context.Context, selectType SelectType, result Result, sql string, args ...interface{},
 ) (err error) {
 	if !m.cacheEnabled || m.tx != nil {
 		return
@@ -108,18 +108,19 @@ func (m *Model) saveSelectResultToCache(
 	// Special handler for Value/Count operations result.
 	if len(result) > 0 {
 		var core = m.db.GetCore()
-		switch queryType {
-		case queryTypeValue, queryTypeCount:
+		switch selectType {
+		case SelectTypeValue, SelectTypeArray, SelectTypeCount:
 			if internalData := core.getInternalColumnFromCtx(ctx); internalData != nil {
 				if result[0][internalData.FirstResultColumn].IsEmpty() {
 					result = nil
 				}
 			}
+		default:
 		}
 	}
 
 	// In case of Cache Penetration.
-	if result.IsEmpty() {
+	if result != nil && result.IsEmpty() {
 		if m.cacheOption.Force {
 			result = Result{}
 		} else {

database/gdb/gdb_model_hook.go

@@ -66,11 +66,12 @@ type internalParamHookDelete struct {
 // which is usually not be interesting for upper business hook handler.
 type HookSelectInput struct {
 	internalParamHookSelect
-	Model  *Model        // Current operation Model.
-	Table  string        // The table name that to be used. Update this attribute to change target table name.
-	Schema string        // The schema name that to be used. Update this attribute to change target schema name.
-	Sql    string        // The sql string that to be committed.
-	Args   []interface{} // The arguments of sql.
+	Model      *Model        // Current operation Model.
+	Table      string        // The table name that to be used. Update this attribute to change target table name.
+	Schema     string        // The schema name that to be used. Update this attribute to change target schema name.
+	Sql        string        // The sql string that to be committed.
+	Args       []interface{} // The arguments of sql.
+	SelectType SelectType    // The type of this SELECT operation.
 }
 
 // HookInsertInput holds the parameters for insert hook operation.

database/gdb/gdb_model_select.go

@@ -28,7 +28,7 @@ import (
 // see Model.Where.
 func (m *Model) All(where ...interface{}) (Result, error) {
 	var ctx = m.GetCtx()
-	return m.doGetAll(ctx, false, where...)
+	return m.doGetAll(ctx, SelectTypeDefault, false, where...)
 }
 
 // AllAndCount retrieves all records and the total count of records from the model.
@@ -69,7 +69,7 @@ func (m *Model) AllAndCount(useFieldForCount bool) (result Result, totalCount in
 	}
 
 	// Retrieve all records
-	result, err = m.doGetAll(m.GetCtx(), false)
+	result, err = m.doGetAll(m.GetCtx(), SelectTypeDefault, false)
 	return
 }
 
@@ -110,7 +110,7 @@ func (m *Model) One(where ...interface{}) (Record, error) {
 	if len(where) > 0 {
 		return m.Where(where[0], where[1:]...).One()
 	}
-	all, err := m.doGetAll(ctx, true)
+	all, err := m.doGetAll(ctx, SelectTypeDefault, true)
 	if err != nil {
 		return nil, err
 	}
@@ -136,24 +136,41 @@ func (m *Model) Array(fieldsAndWhere ...interface{}) ([]Value, error) {
 			return m.Fields(gconv.String(fieldsAndWhere[0])).Array()
 		}
 	}
-	all, err := m.All()
+
+	var (
+		field string
+		core  = m.db.GetCore()
+		ctx   = core.injectInternalColumn(m.GetCtx())
+	)
+	all, err := m.doGetAll(ctx, SelectTypeArray, false)
 	if err != nil {
 		return nil, err
 	}
-	var field string
 	if len(all) > 0 {
-		var recordFields = m.getRecordFields(all[0])
-		if len(recordFields) > 1 {
-			// it returns error if there are multiple fields in the result record.
-			return nil, gerror.NewCodef(
-				gcode.CodeInvalidParameter,
-				`invalid fields for "Array" operation, result fields number "%d"%s, but expect one`,
-				len(recordFields),
-				gjson.MustEncodeString(recordFields),
+		internalData := core.getInternalColumnFromCtx(ctx)
+		if internalData == nil {
+			return nil, gerror.NewCode(
+				gcode.CodeInternalError,
+				`query count error: the internal context data is missing. there's internal issue should be fixed`,
 			)
 		}
-		if len(recordFields) == 1 {
-			field = recordFields[0]
+		// If FirstResultColumn present, it returns the value of the first record of the first field.
+		// It means it use no cache mechanism, while cache mechanism makes `internalData` missing.
+		field = internalData.FirstResultColumn
+		if field == "" {
+			// Fields number check.
+			var recordFields = m.getRecordFields(all[0])
+			if len(recordFields) == 1 {
+				field = recordFields[0]
+			} else {
+				// it returns error if there are multiple fields in the result record.
+				return nil, gerror.NewCodef(
+					gcode.CodeInvalidParameter,
+					`invalid fields for "Array" operation, result fields number "%d"%s, but expect one`,
+					len(recordFields),
+					gjson.MustEncodeString(recordFields),
+				)
+			}
 		}
 	}
 	return all.Array(field), nil
@@ -398,13 +415,26 @@ func (m *Model) Value(fieldsAndWhere ...interface{}) (Value, error) {
 		}
 	}
 	var (
-		sqlWithHolder, holderArgs = m.getFormattedSqlAndArgs(ctx, queryTypeValue, true)
-		all, err                  = m.doGetAllBySql(ctx, queryTypeValue, sqlWithHolder, holderArgs...)
+		sqlWithHolder, holderArgs = m.getFormattedSqlAndArgs(ctx, SelectTypeValue, true)
+		all, err                  = m.doGetAllBySql(ctx, SelectTypeValue, sqlWithHolder, holderArgs...)
 	)
 	if err != nil {
 		return nil, err
 	}
 	if len(all) > 0 {
+		internalData := core.getInternalColumnFromCtx(ctx)
+		if internalData == nil {
+			return nil, gerror.NewCode(
+				gcode.CodeInternalError,
+				`query count error: the internal context data is missing. there's internal issue should be fixed`,
+			)
+		}
+		// If FirstResultColumn present, it returns the value of the first record of the first field.
+		// It means it use no cache mechanism, while cache mechanism makes `internalData` missing.
+		if v, ok := all[0][internalData.FirstResultColumn]; ok {
+			return v, nil
+		}
+		// Fields number check.
 		var recordFields = m.getRecordFields(all[0])
 		if len(recordFields) == 1 {
 			for _, v := range all[0] {
@@ -445,13 +475,26 @@ func (m *Model) Count(where ...interface{}) (int, error) {
 		return m.Where(where[0], where[1:]...).Count()
 	}
 	var (
-		sqlWithHolder, holderArgs = m.getFormattedSqlAndArgs(ctx, queryTypeCount, false)
-		all, err                  = m.doGetAllBySql(ctx, queryTypeCount, sqlWithHolder, holderArgs...)
+		sqlWithHolder, holderArgs = m.getFormattedSqlAndArgs(ctx, SelectTypeCount, false)
+		all, err                  = m.doGetAllBySql(ctx, SelectTypeCount, sqlWithHolder, holderArgs...)
 	)
 	if err != nil {
 		return 0, err
 	}
 	if len(all) > 0 {
+		internalData := core.getInternalColumnFromCtx(ctx)
+		if internalData == nil {
+			return 0, gerror.NewCode(
+				gcode.CodeInternalError,
+				`query count error: the internal context data is missing. there's internal issue should be fixed`,
+			)
+		}
+		// If FirstResultColumn present, it returns the value of the first record of the first field.
+		// It means it use no cache mechanism, while cache mechanism makes `internalData` missing.
+		if v, ok := all[0][internalData.FirstResultColumn]; ok {
+			return v.Int(), nil
+		}
+		// Fields number check.
 		var recordFields = m.getRecordFields(all[0])
 		if len(recordFields) == 1 {
 			for _, v := range all[0] {
@@ -616,17 +659,17 @@ func (m *Model) Having(having interface{}, args ...interface{}) *Model {
 // The parameter `limit1` specifies whether limits querying only one record if m.limit is not set.
 // The optional parameter `where` is the same as the parameter of Model.Where function,
 // see Model.Where.
-func (m *Model) doGetAll(ctx context.Context, limit1 bool, where ...interface{}) (Result, error) {
+func (m *Model) doGetAll(ctx context.Context, selectType SelectType, limit1 bool, where ...interface{}) (Result, error) {
 	if len(where) > 0 {
 		return m.Where(where[0], where[1:]...).All()
 	}
-	sqlWithHolder, holderArgs := m.getFormattedSqlAndArgs(ctx, queryTypeNormal, limit1)
-	return m.doGetAllBySql(ctx, queryTypeNormal, sqlWithHolder, holderArgs...)
+	sqlWithHolder, holderArgs := m.getFormattedSqlAndArgs(ctx, selectType, limit1)
+	return m.doGetAllBySql(ctx, selectType, sqlWithHolder, holderArgs...)
 }
 
 // doGetAllBySql does the select statement on the database.
 func (m *Model) doGetAllBySql(
-	ctx context.Context, queryType queryType, sql string, args ...interface{},
+	ctx context.Context, selectType SelectType, sql string, args ...interface{},
 ) (result Result, err error) {
 	if result, err = m.getSelectResultFromCache(ctx, sql, args...); err != nil || result != nil {
 		return
@@ -639,24 +682,25 @@ func (m *Model) doGetAllBySql(
 			},
 			handler: m.hookHandler.Select,
 		},
-		Model: m,
-		Table: m.tables,
-		Sql:   sql,
-		Args:  m.mergeArguments(args),
+		Model:      m,
+		Table:      m.tables,
+		Sql:        sql,
+		Args:       m.mergeArguments(args),
+		SelectType: selectType,
 	}
 	if result, err = in.Next(ctx); err != nil {
 		return
 	}
 
-	err = m.saveSelectResultToCache(ctx, queryType, result, sql, args...)
+	err = m.saveSelectResultToCache(ctx, selectType, result, sql, args...)
 	return
 }
 
 func (m *Model) getFormattedSqlAndArgs(
-	ctx context.Context, queryType queryType, limit1 bool,
+	ctx context.Context, selectType SelectType, limit1 bool,
 ) (sqlWithHolder string, holderArgs []interface{}) {
-	switch queryType {
-	case queryTypeCount:
+	switch selectType {
+	case SelectTypeCount:
 		queryFields := "COUNT(1)"
 		if len(m.fields) > 0 {
 			// DO NOT quote the m.fields here, in case of fields like:
@@ -698,7 +742,7 @@ func (m *Model) getFormattedSqlAndArgs(
 
 func (m *Model) getHolderAndArgsAsSubModel(ctx context.Context) (holder string, args []interface{}) {
 	holder, args = m.getFormattedSqlAndArgs(
-		ctx, queryTypeNormal, false,
+		ctx, SelectTypeDefault, false,
 	)
 	args = m.mergeArguments(args)
 	return