1. 实现配置文件解析

2. 实现数据库连接

vendor/gorm.io/gorm/clause/clause.go

@@ -0,0 +1,89 @@
+package clause
+
+// Interface clause interface
+type Interface interface {
+	Name() string
+	Build(Builder)
+	MergeClause(*Clause)
+}
+
+// ClauseBuilder clause builder, allows to customize how to build clause
+type ClauseBuilder func(Clause, Builder)
+
+type Writer interface {
+	WriteByte(byte) error
+	WriteString(string) (int, error)
+}
+
+// Builder builder interface
+type Builder interface {
+	Writer
+	WriteQuoted(field interface{})
+	AddVar(Writer, ...interface{})
+	AddError(error) error
+}
+
+// Clause
+type Clause struct {
+	Name                string // WHERE
+	BeforeExpression    Expression
+	AfterNameExpression Expression
+	AfterExpression     Expression
+	Expression          Expression
+	Builder             ClauseBuilder
+}
+
+// Build build clause
+func (c Clause) Build(builder Builder) {
+	if c.Builder != nil {
+		c.Builder(c, builder)
+	} else if c.Expression != nil {
+		if c.BeforeExpression != nil {
+			c.BeforeExpression.Build(builder)
+			builder.WriteByte(' ')
+		}
+
+		if c.Name != "" {
+			builder.WriteString(c.Name)
+			builder.WriteByte(' ')
+		}
+
+		if c.AfterNameExpression != nil {
+			c.AfterNameExpression.Build(builder)
+			builder.WriteByte(' ')
+		}
+
+		c.Expression.Build(builder)
+
+		if c.AfterExpression != nil {
+			builder.WriteByte(' ')
+			c.AfterExpression.Build(builder)
+		}
+	}
+}
+
+const (
+	PrimaryKey   string = "~~~py~~~" // primary key
+	CurrentTable string = "~~~ct~~~" // current table
+	Associations string = "~~~as~~~" // associations
+)
+
+var (
+	currentTable  = Table{Name: CurrentTable}
+	PrimaryColumn = Column{Table: CurrentTable, Name: PrimaryKey}
+)
+
+// Column quote with name
+type Column struct {
+	Table string
+	Name  string
+	Alias string
+	Raw   bool
+}
+
+// Table quote with name
+type Table struct {
+	Name  string
+	Alias string
+	Raw   bool
+}

vendor/gorm.io/gorm/clause/delete.go

@@ -0,0 +1,23 @@
+package clause
+
+type Delete struct {
+	Modifier string
+}
+
+func (d Delete) Name() string {
+	return "DELETE"
+}
+
+func (d Delete) Build(builder Builder) {
+	builder.WriteString("DELETE")
+
+	if d.Modifier != "" {
+		builder.WriteByte(' ')
+		builder.WriteString(d.Modifier)
+	}
+}
+
+func (d Delete) MergeClause(clause *Clause) {
+	clause.Name = ""
+	clause.Expression = d
+}

vendor/gorm.io/gorm/clause/expression.go

@@ -0,0 +1,385 @@
+package clause
+
+import (
+	"database/sql"
+	"database/sql/driver"
+	"go/ast"
+	"reflect"
+)
+
+// Expression expression interface
+type Expression interface {
+	Build(builder Builder)
+}
+
+// NegationExpressionBuilder negation expression builder
+type NegationExpressionBuilder interface {
+	NegationBuild(builder Builder)
+}
+
+// Expr raw expression
+type Expr struct {
+	SQL                string
+	Vars               []interface{}
+	WithoutParentheses bool
+}
+
+// Build build raw expression
+func (expr Expr) Build(builder Builder) {
+	var (
+		afterParenthesis bool
+		idx              int
+	)
+
+	for _, v := range []byte(expr.SQL) {
+		if v == '?' && len(expr.Vars) > idx {
+			if afterParenthesis || expr.WithoutParentheses {
+				if _, ok := expr.Vars[idx].(driver.Valuer); ok {
+					builder.AddVar(builder, expr.Vars[idx])
+				} else {
+					switch rv := reflect.ValueOf(expr.Vars[idx]); rv.Kind() {
+					case reflect.Slice, reflect.Array:
+						if rv.Len() == 0 {
+							builder.AddVar(builder, nil)
+						} else {
+							for i := 0; i < rv.Len(); i++ {
+								if i > 0 {
+									builder.WriteByte(',')
+								}
+								builder.AddVar(builder, rv.Index(i).Interface())
+							}
+						}
+					default:
+						builder.AddVar(builder, expr.Vars[idx])
+					}
+				}
+			} else {
+				builder.AddVar(builder, expr.Vars[idx])
+			}
+
+			idx++
+		} else {
+			if v == '(' {
+				afterParenthesis = true
+			} else {
+				afterParenthesis = false
+			}
+			builder.WriteByte(v)
+		}
+	}
+
+	if idx < len(expr.Vars) {
+		for _, v := range expr.Vars[idx:] {
+			builder.AddVar(builder, sql.NamedArg{Value: v})
+		}
+	}
+}
+
+// NamedExpr raw expression for named expr
+type NamedExpr struct {
+	SQL  string
+	Vars []interface{}
+}
+
+// Build build raw expression
+func (expr NamedExpr) Build(builder Builder) {
+	var (
+		idx              int
+		inName           bool
+		afterParenthesis bool
+		namedMap         = make(map[string]interface{}, len(expr.Vars))
+	)
+
+	for _, v := range expr.Vars {
+		switch value := v.(type) {
+		case sql.NamedArg:
+			namedMap[value.Name] = value.Value
+		case map[string]interface{}:
+			for k, v := range value {
+				namedMap[k] = v
+			}
+		default:
+			var appendFieldsToMap func(reflect.Value)
+			appendFieldsToMap = func(reflectValue reflect.Value) {
+				reflectValue = reflect.Indirect(reflectValue)
+				switch reflectValue.Kind() {
+				case reflect.Struct:
+					modelType := reflectValue.Type()
+					for i := 0; i < modelType.NumField(); i++ {
+						if fieldStruct := modelType.Field(i); ast.IsExported(fieldStruct.Name) {
+							namedMap[fieldStruct.Name] = reflectValue.Field(i).Interface()
+
+							if fieldStruct.Anonymous {
+								appendFieldsToMap(reflectValue.Field(i))
+							}
+						}
+					}
+				}
+			}
+
+			appendFieldsToMap(reflect.ValueOf(value))
+		}
+	}
+
+	name := make([]byte, 0, 10)
+
+	for _, v := range []byte(expr.SQL) {
+		if v == '@' && !inName {
+			inName = true
+			name = name[:0]
+		} else if v == ' ' || v == ',' || v == ')' || v == '"' || v == '\'' || v == '`' || v == '\r' || v == '\n' || v == ';' {
+			if inName {
+				if nv, ok := namedMap[string(name)]; ok {
+					builder.AddVar(builder, nv)
+				} else {
+					builder.WriteByte('@')
+					builder.WriteString(string(name))
+				}
+				inName = false
+			}
+
+			afterParenthesis = false
+			builder.WriteByte(v)
+		} else if v == '?' && len(expr.Vars) > idx {
+			if afterParenthesis {
+				if _, ok := expr.Vars[idx].(driver.Valuer); ok {
+					builder.AddVar(builder, expr.Vars[idx])
+				} else {
+					switch rv := reflect.ValueOf(expr.Vars[idx]); rv.Kind() {
+					case reflect.Slice, reflect.Array:
+						if rv.Len() == 0 {
+							builder.AddVar(builder, nil)
+						} else {
+							for i := 0; i < rv.Len(); i++ {
+								if i > 0 {
+									builder.WriteByte(',')
+								}
+								builder.AddVar(builder, rv.Index(i).Interface())
+							}
+						}
+					default:
+						builder.AddVar(builder, expr.Vars[idx])
+					}
+				}
+			} else {
+				builder.AddVar(builder, expr.Vars[idx])
+			}
+
+			idx++
+		} else if inName {
+			name = append(name, v)
+		} else {
+			if v == '(' {
+				afterParenthesis = true
+			} else {
+				afterParenthesis = false
+			}
+			builder.WriteByte(v)
+		}
+	}
+
+	if inName {
+		if nv, ok := namedMap[string(name)]; ok {
+			builder.AddVar(builder, nv)
+		} else {
+			builder.WriteByte('@')
+			builder.WriteString(string(name))
+		}
+	}
+}
+
+// IN Whether a value is within a set of values
+type IN struct {
+	Column interface{}
+	Values []interface{}
+}
+
+func (in IN) Build(builder Builder) {
+	builder.WriteQuoted(in.Column)
+
+	switch len(in.Values) {
+	case 0:
+		builder.WriteString(" IN (NULL)")
+	case 1:
+		if _, ok := in.Values[0].([]interface{}); !ok {
+			builder.WriteString(" = ")
+			builder.AddVar(builder, in.Values[0])
+			break
+		}
+
+		fallthrough
+	default:
+		builder.WriteString(" IN (")
+		builder.AddVar(builder, in.Values...)
+		builder.WriteByte(')')
+	}
+}
+
+func (in IN) NegationBuild(builder Builder) {
+	builder.WriteQuoted(in.Column)
+	switch len(in.Values) {
+	case 0:
+		builder.WriteString(" IS NOT NULL")
+	case 1:
+		if _, ok := in.Values[0].([]interface{}); !ok {
+			builder.WriteString(" <> ")
+			builder.AddVar(builder, in.Values[0])
+			break
+		}
+
+		fallthrough
+	default:
+		builder.WriteString(" NOT IN (")
+		builder.AddVar(builder, in.Values...)
+		builder.WriteByte(')')
+	}
+}
+
+// Eq equal to for where
+type Eq struct {
+	Column interface{}
+	Value  interface{}
+}
+
+func (eq Eq) Build(builder Builder) {
+	builder.WriteQuoted(eq.Column)
+
+	switch eq.Value.(type) {
+	case []string, []int, []int32, []int64, []uint, []uint32, []uint64, []interface{}:
+		rv := reflect.ValueOf(eq.Value)
+		if rv.Len() == 0 {
+			builder.WriteString(" IN (NULL)")
+		} else {
+			builder.WriteString(" IN (")
+			for i := 0; i < rv.Len(); i++ {
+				if i > 0 {
+					builder.WriteByte(',')
+				}
+				builder.AddVar(builder, rv.Index(i).Interface())
+			}
+			builder.WriteByte(')')
+		}
+	default:
+		if eqNil(eq.Value) {
+			builder.WriteString(" IS NULL")
+		} else {
+			builder.WriteString(" = ")
+			builder.AddVar(builder, eq.Value)
+		}
+	}
+}
+
+func (eq Eq) NegationBuild(builder Builder) {
+	Neq(eq).Build(builder)
+}
+
+// Neq not equal to for where
+type Neq Eq
+
+func (neq Neq) Build(builder Builder) {
+	builder.WriteQuoted(neq.Column)
+
+	switch neq.Value.(type) {
+	case []string, []int, []int32, []int64, []uint, []uint32, []uint64, []interface{}:
+		builder.WriteString(" NOT IN (")
+		rv := reflect.ValueOf(neq.Value)
+		for i := 0; i < rv.Len(); i++ {
+			if i > 0 {
+				builder.WriteByte(',')
+			}
+			builder.AddVar(builder, rv.Index(i).Interface())
+		}
+		builder.WriteByte(')')
+	default:
+		if eqNil(neq.Value) {
+			builder.WriteString(" IS NOT NULL")
+		} else {
+			builder.WriteString(" <> ")
+			builder.AddVar(builder, neq.Value)
+		}
+	}
+}
+
+func (neq Neq) NegationBuild(builder Builder) {
+	Eq(neq).Build(builder)
+}
+
+// Gt greater than for where
+type Gt Eq
+
+func (gt Gt) Build(builder Builder) {
+	builder.WriteQuoted(gt.Column)
+	builder.WriteString(" > ")
+	builder.AddVar(builder, gt.Value)
+}
+
+func (gt Gt) NegationBuild(builder Builder) {
+	Lte(gt).Build(builder)
+}
+
+// Gte greater than or equal to for where
+type Gte Eq
+
+func (gte Gte) Build(builder Builder) {
+	builder.WriteQuoted(gte.Column)
+	builder.WriteString(" >= ")
+	builder.AddVar(builder, gte.Value)
+}
+
+func (gte Gte) NegationBuild(builder Builder) {
+	Lt(gte).Build(builder)
+}
+
+// Lt less than for where
+type Lt Eq
+
+func (lt Lt) Build(builder Builder) {
+	builder.WriteQuoted(lt.Column)
+	builder.WriteString(" < ")
+	builder.AddVar(builder, lt.Value)
+}
+
+func (lt Lt) NegationBuild(builder Builder) {
+	Gte(lt).Build(builder)
+}
+
+// Lte less than or equal to for where
+type Lte Eq
+
+func (lte Lte) Build(builder Builder) {
+	builder.WriteQuoted(lte.Column)
+	builder.WriteString(" <= ")
+	builder.AddVar(builder, lte.Value)
+}
+
+func (lte Lte) NegationBuild(builder Builder) {
+	Gt(lte).Build(builder)
+}
+
+// Like whether string matches regular expression
+type Like Eq
+
+func (like Like) Build(builder Builder) {
+	builder.WriteQuoted(like.Column)
+	builder.WriteString(" LIKE ")
+	builder.AddVar(builder, like.Value)
+}
+
+func (like Like) NegationBuild(builder Builder) {
+	builder.WriteQuoted(like.Column)
+	builder.WriteString(" NOT LIKE ")
+	builder.AddVar(builder, like.Value)
+}
+
+func eqNil(value interface{}) bool {
+	if valuer, ok := value.(driver.Valuer); ok && !eqNilReflect(valuer) {
+		value, _ = valuer.Value()
+	}
+
+	return value == nil || eqNilReflect(value)
+}
+
+func eqNilReflect(value interface{}) bool {
+	reflectValue := reflect.ValueOf(value)
+	return reflectValue.Kind() == reflect.Ptr && reflectValue.IsNil()
+}

vendor/gorm.io/gorm/clause/from.go

@@ -0,0 +1,37 @@
+package clause
+
+// From from clause
+type From struct {
+	Tables []Table
+	Joins  []Join
+}
+
+// Name from clause name
+func (from From) Name() string {
+	return "FROM"
+}
+
+// Build build from clause
+func (from From) Build(builder Builder) {
+	if len(from.Tables) > 0 {
+		for idx, table := range from.Tables {
+			if idx > 0 {
+				builder.WriteByte(',')
+			}
+
+			builder.WriteQuoted(table)
+		}
+	} else {
+		builder.WriteQuoted(currentTable)
+	}
+
+	for _, join := range from.Joins {
+		builder.WriteByte(' ')
+		join.Build(builder)
+	}
+}
+
+// MergeClause merge from clause
+func (from From) MergeClause(clause *Clause) {
+	clause.Expression = from
+}

vendor/gorm.io/gorm/clause/group_by.go

@@ -0,0 +1,48 @@
+package clause
+
+// GroupBy group by clause
+type GroupBy struct {
+	Columns []Column
+	Having  []Expression
+}
+
+// Name from clause name
+func (groupBy GroupBy) Name() string {
+	return "GROUP BY"
+}
+
+// Build build group by clause
+func (groupBy GroupBy) Build(builder Builder) {
+	for idx, column := range groupBy.Columns {
+		if idx > 0 {
+			builder.WriteByte(',')
+		}
+
+		builder.WriteQuoted(column)
+	}
+
+	if len(groupBy.Having) > 0 {
+		builder.WriteString(" HAVING ")
+		Where{Exprs: groupBy.Having}.Build(builder)
+	}
+}
+
+// MergeClause merge group by clause
+func (groupBy GroupBy) MergeClause(clause *Clause) {
+	if v, ok := clause.Expression.(GroupBy); ok {
+		copiedColumns := make([]Column, len(v.Columns))
+		copy(copiedColumns, v.Columns)
+		groupBy.Columns = append(copiedColumns, groupBy.Columns...)
+
+		copiedHaving := make([]Expression, len(v.Having))
+		copy(copiedHaving, v.Having)
+		groupBy.Having = append(copiedHaving, groupBy.Having...)
+	}
+	clause.Expression = groupBy
+
+	if len(groupBy.Columns) == 0 {
+		clause.Name = ""
+	} else {
+		clause.Name = groupBy.Name()
+	}
+}

vendor/gorm.io/gorm/clause/insert.go

@@ -0,0 +1,39 @@
+package clause
+
+type Insert struct {
+	Table    Table
+	Modifier string
+}
+
+// Name insert clause name
+func (insert Insert) Name() string {
+	return "INSERT"
+}
+
+// Build build insert clause
+func (insert Insert) Build(builder Builder) {
+	if insert.Modifier != "" {
+		builder.WriteString(insert.Modifier)
+		builder.WriteByte(' ')
+	}
+
+	builder.WriteString("INTO ")
+	if insert.Table.Name == "" {
+		builder.WriteQuoted(currentTable)
+	} else {
+		builder.WriteQuoted(insert.Table)
+	}
+}
+
+// MergeClause merge insert clause
+func (insert Insert) MergeClause(clause *Clause) {
+	if v, ok := clause.Expression.(Insert); ok {
+		if insert.Modifier == "" {
+			insert.Modifier = v.Modifier
+		}
+		if insert.Table.Name == "" {
+			insert.Table = v.Table
+		}
+	}
+	clause.Expression = insert
+}

vendor/gorm.io/gorm/clause/joins.go

@@ -0,0 +1,47 @@
+package clause
+
+type JoinType string
+
+const (
+	CrossJoin JoinType = "CROSS"
+	InnerJoin JoinType = "INNER"
+	LeftJoin  JoinType = "LEFT"
+	RightJoin JoinType = "RIGHT"
+)
+
+// Join clause for from
+type Join struct {
+	Type       JoinType
+	Table      Table
+	ON         Where
+	Using      []string
+	Expression Expression
+}
+
+func (join Join) Build(builder Builder) {
+	if join.Expression != nil {
+		join.Expression.Build(builder)
+	} else {
+		if join.Type != "" {
+			builder.WriteString(string(join.Type))
+			builder.WriteByte(' ')
+		}
+
+		builder.WriteString("JOIN ")
+		builder.WriteQuoted(join.Table)
+
+		if len(join.ON.Exprs) > 0 {
+			builder.WriteString(" ON ")
+			join.ON.Build(builder)
+		} else if len(join.Using) > 0 {
+			builder.WriteString(" USING (")
+			for idx, c := range join.Using {
+				if idx > 0 {
+					builder.WriteByte(',')
+				}
+				builder.WriteQuoted(c)
+			}
+			builder.WriteByte(')')
+		}
+	}
+}

vendor/gorm.io/gorm/clause/limit.go

@@ -0,0 +1,46 @@
+package clause
+
+// Limit limit clause
+type Limit struct {
+	Limit  *int
+	Offset int
+}
+
+// Name where clause name
+func (limit Limit) Name() string {
+	return "LIMIT"
+}
+
+// Build build where clause
+func (limit Limit) Build(builder Builder) {
+	if limit.Limit != nil && *limit.Limit >= 0 {
+		builder.WriteString("LIMIT ")
+		builder.AddVar(builder, *limit.Limit)
+	}
+	if limit.Offset > 0 {
+		if limit.Limit != nil && *limit.Limit >= 0 {
+			builder.WriteByte(' ')
+		}
+		builder.WriteString("OFFSET ")
+		builder.AddVar(builder, limit.Offset)
+	}
+}
+
+// MergeClause merge order by clauses
+func (limit Limit) MergeClause(clause *Clause) {
+	clause.Name = ""
+
+	if v, ok := clause.Expression.(Limit); ok {
+		if (limit.Limit == nil || *limit.Limit == 0) && v.Limit != nil {
+			limit.Limit = v.Limit
+		}
+
+		if limit.Offset == 0 && v.Offset > 0 {
+			limit.Offset = v.Offset
+		} else if limit.Offset < 0 {
+			limit.Offset = 0
+		}
+	}
+
+	clause.Expression = limit
+}

vendor/gorm.io/gorm/clause/locking.go

@@ -0,0 +1,38 @@
+package clause
+
+const (
+	LockingStrengthUpdate    = "UPDATE"
+	LockingStrengthShare     = "SHARE"
+	LockingOptionsSkipLocked = "SKIP LOCKED"
+	LockingOptionsNoWait     = "NOWAIT"
+)
+
+type Locking struct {
+	Strength string
+	Table    Table
+	Options  string
+}
+
+// Name where clause name
+func (locking Locking) Name() string {
+	return "FOR"
+}
+
+// Build build where clause
+func (locking Locking) Build(builder Builder) {
+	builder.WriteString(locking.Strength)
+	if locking.Table.Name != "" {
+		builder.WriteString(" OF ")
+		builder.WriteQuoted(locking.Table)
+	}
+
+	if locking.Options != "" {
+		builder.WriteByte(' ')
+		builder.WriteString(locking.Options)
+	}
+}
+
+// MergeClause merge order by clauses
+func (locking Locking) MergeClause(clause *Clause) {
+	clause.Expression = locking
+}

vendor/gorm.io/gorm/clause/on_conflict.go

@@ -0,0 +1,59 @@
+package clause
+
+type OnConflict struct {
+	Columns      []Column
+	Where        Where
+	TargetWhere  Where
+	OnConstraint string
+	DoNothing    bool
+	DoUpdates    Set
+	UpdateAll    bool
+}
+
+func (OnConflict) Name() string {
+	return "ON CONFLICT"
+}
+
+// Build build onConflict clause
+func (onConflict OnConflict) Build(builder Builder) {
+	if onConflict.OnConstraint != "" {
+		builder.WriteString("ON CONSTRAINT ")
+		builder.WriteString(onConflict.OnConstraint)
+		builder.WriteByte(' ')
+	} else {
+		if len(onConflict.Columns) > 0 {
+			builder.WriteByte('(')
+			for idx, column := range onConflict.Columns {
+				if idx > 0 {
+					builder.WriteByte(',')
+				}
+				builder.WriteQuoted(column)
+			}
+			builder.WriteString(`) `)
+		}
+
+		if len(onConflict.TargetWhere.Exprs) > 0 {
+			builder.WriteString(" WHERE ")
+			onConflict.TargetWhere.Build(builder)
+			builder.WriteByte(' ')
+		}
+	}
+
+	if onConflict.DoNothing {
+		builder.WriteString("DO NOTHING")
+	} else {
+		builder.WriteString("DO UPDATE SET ")
+		onConflict.DoUpdates.Build(builder)
+	}
+
+	if len(onConflict.Where.Exprs) > 0 {
+		builder.WriteString(" WHERE ")
+		onConflict.Where.Build(builder)
+		builder.WriteByte(' ')
+	}
+}
+
+// MergeClause merge onConflict clauses
+func (onConflict OnConflict) MergeClause(clause *Clause) {
+	clause.Expression = onConflict
+}

vendor/gorm.io/gorm/clause/order_by.go

@@ -0,0 +1,54 @@
+package clause
+
+type OrderByColumn struct {
+	Column  Column
+	Desc    bool
+	Reorder bool
+}
+
+type OrderBy struct {
+	Columns    []OrderByColumn
+	Expression Expression
+}
+
+// Name where clause name
+func (orderBy OrderBy) Name() string {
+	return "ORDER BY"
+}
+
+// Build build where clause
+func (orderBy OrderBy) Build(builder Builder) {
+	if orderBy.Expression != nil {
+		orderBy.Expression.Build(builder)
+	} else {
+		for idx, column := range orderBy.Columns {
+			if idx > 0 {
+				builder.WriteByte(',')
+			}
+
+			builder.WriteQuoted(column.Column)
+			if column.Desc {
+				builder.WriteString(" DESC")
+			}
+		}
+	}
+}
+
+// MergeClause merge order by clauses
+func (orderBy OrderBy) MergeClause(clause *Clause) {
+	if v, ok := clause.Expression.(OrderBy); ok {
+		for i := len(orderBy.Columns) - 1; i >= 0; i-- {
+			if orderBy.Columns[i].Reorder {
+				orderBy.Columns = orderBy.Columns[i:]
+				clause.Expression = orderBy
+				return
+			}
+		}
+
+		copiedColumns := make([]OrderByColumn, len(v.Columns))
+		copy(copiedColumns, v.Columns)
+		orderBy.Columns = append(copiedColumns, orderBy.Columns...)
+	}
+
+	clause.Expression = orderBy
+}

vendor/gorm.io/gorm/clause/returning.go

@@ -0,0 +1,34 @@
+package clause
+
+type Returning struct {
+	Columns []Column
+}
+
+// Name where clause name
+func (returning Returning) Name() string {
+	return "RETURNING"
+}
+
+// Build build where clause
+func (returning Returning) Build(builder Builder) {
+	if len(returning.Columns) > 0 {
+		for idx, column := range returning.Columns {
+			if idx > 0 {
+				builder.WriteByte(',')
+			}
+
+			builder.WriteQuoted(column)
+		}
+	} else {
+		builder.WriteByte('*')
+	}
+}
+
+// MergeClause merge order by clauses
+func (returning Returning) MergeClause(clause *Clause) {
+	if v, ok := clause.Expression.(Returning); ok {
+		returning.Columns = append(v.Columns, returning.Columns...)
+	}
+
+	clause.Expression = returning
+}

vendor/gorm.io/gorm/clause/select.go

@@ -0,0 +1,59 @@
+package clause
+
+// Select select attrs when querying, updating, creating
+type Select struct {
+	Distinct   bool
+	Columns    []Column
+	Expression Expression
+}
+
+func (s Select) Name() string {
+	return "SELECT"
+}
+
+func (s Select) Build(builder Builder) {
+	if len(s.Columns) > 0 {
+		if s.Distinct {
+			builder.WriteString("DISTINCT ")
+		}
+
+		for idx, column := range s.Columns {
+			if idx > 0 {
+				builder.WriteByte(',')
+			}
+			builder.WriteQuoted(column)
+		}
+	} else {
+		builder.WriteByte('*')
+	}
+}
+
+func (s Select) MergeClause(clause *Clause) {
+	if s.Expression != nil {
+		if s.Distinct {
+			if expr, ok := s.Expression.(Expr); ok {
+				expr.SQL = "DISTINCT " + expr.SQL
+				clause.Expression = expr
+				return
+			}
+		}
+
+		clause.Expression = s.Expression
+	} else {
+		clause.Expression = s
+	}
+}
+
+// CommaExpression represents a group of expressions separated by commas.
+type CommaExpression struct {
+	Exprs []Expression
+}
+
+func (comma CommaExpression) Build(builder Builder) {
+	for idx, expr := range comma.Exprs {
+		if idx > 0 {
+			_, _ = builder.WriteString(", ")
+		}
+		expr.Build(builder)
+	}
+}

vendor/gorm.io/gorm/clause/set.go

@@ -0,0 +1,60 @@
+package clause
+
+import "sort"
+
+type Set []Assignment
+
+type Assignment struct {
+	Column Column
+	Value  interface{}
+}
+
+func (set Set) Name() string {
+	return "SET"
+}
+
+func (set Set) Build(builder Builder) {
+	if len(set) > 0 {
+		for idx, assignment := range set {
+			if idx > 0 {
+				builder.WriteByte(',')
+			}
+			builder.WriteQuoted(assignment.Column)
+			builder.WriteByte('=')
+			builder.AddVar(builder, assignment.Value)
+		}
+	} else {
+		builder.WriteQuoted(Column{Name: PrimaryKey})
+		builder.WriteByte('=')
+		builder.WriteQuoted(Column{Name: PrimaryKey})
+	}
+}
+
+// MergeClause merge assignments clauses
+func (set Set) MergeClause(clause *Clause) {
+	copiedAssignments := make([]Assignment, len(set))
+	copy(copiedAssignments, set)
+	clause.Expression = Set(copiedAssignments)
+}
+
+func Assignments(values map[string]interface{}) Set {
+	keys := make([]string, 0, len(values))
+	for key := range values {
+		keys = append(keys, key)
+	}
+	sort.Strings(keys)
+
+	assignments := make([]Assignment, len(keys))
+	for idx, key := range keys {
+		assignments[idx] = Assignment{Column: Column{Name: key}, Value: values[key]}
+	}
+	return assignments
+}
+
+func AssignmentColumns(values []string) Set {
+	assignments := make([]Assignment, len(values))
+	for idx, value := range values {
+		assignments[idx] = Assignment{Column: Column{Name: value}, Value: Column{Table: "excluded", Name: value}}
+	}
+	return assignments
+}

vendor/gorm.io/gorm/clause/update.go

@@ -0,0 +1,38 @@
+package clause
+
+type Update struct {
+	Modifier string
+	Table    Table
+}
+
+// Name update clause name
+func (update Update) Name() string {
+	return "UPDATE"
+}
+
+// Build build update clause
+func (update Update) Build(builder Builder) {
+	if update.Modifier != "" {
+		builder.WriteString(update.Modifier)
+		builder.WriteByte(' ')
+	}
+
+	if update.Table.Name == "" {
+		builder.WriteQuoted(currentTable)
+	} else {
+		builder.WriteQuoted(update.Table)
+	}
+}
+
+// MergeClause merge update clause
+func (update Update) MergeClause(clause *Clause) {
+	if v, ok := clause.Expression.(Update); ok {
+		if update.Modifier == "" {
+			update.Modifier = v.Modifier
+		}
+		if update.Table.Name == "" {
+			update.Table = v.Table
+		}
+	}
+	clause.Expression = update
+}

vendor/gorm.io/gorm/clause/values.go

@@ -0,0 +1,45 @@
+package clause
+
+type Values struct {
+	Columns []Column
+	Values  [][]interface{}
+}
+
+// Name from clause name
+func (Values) Name() string {
+	return "VALUES"
+}
+
+// Build build from clause
+func (values Values) Build(builder Builder) {
+	if len(values.Columns) > 0 {
+		builder.WriteByte('(')
+		for idx, column := range values.Columns {
+			if idx > 0 {
+				builder.WriteByte(',')
+			}
+			builder.WriteQuoted(column)
+		}
+		builder.WriteByte(')')
+
+		builder.WriteString(" VALUES ")
+
+		for idx, value := range values.Values {
+			if idx > 0 {
+				builder.WriteByte(',')
+			}
+
+			builder.WriteByte('(')
+			builder.AddVar(builder, value...)
+			builder.WriteByte(')')
+		}
+	} else {
+		builder.WriteString("DEFAULT VALUES")
+	}
+}
+
+// MergeClause merge values clauses
+func (values Values) MergeClause(clause *Clause) {
+	clause.Name = ""
+	clause.Expression = values
+}

vendor/gorm.io/gorm/clause/where.go

@@ -0,0 +1,201 @@
+package clause
+
+import (
+	"strings"
+)
+
+const (
+	AndWithSpace = " AND "
+	OrWithSpace  = " OR "
+)
+
+// Where where clause
+type Where struct {
+	Exprs []Expression
+}
+
+// Name where clause name
+func (where Where) Name() string {
+	return "WHERE"
+}
+
+// Build build where clause
+func (where Where) Build(builder Builder) {
+    if len(where.Exprs) == 1 {
+        if andCondition, ok := where.Exprs[0].(AndConditions); ok {
+           where.Exprs = andCondition.Exprs
+        }
+    }
+
+	// Switch position if the first query expression is a single Or condition
+	for idx, expr := range where.Exprs {
+		if v, ok := expr.(OrConditions); !ok || len(v.Exprs) > 1 {
+			if idx != 0 {
+				where.Exprs[0], where.Exprs[idx] = where.Exprs[idx], where.Exprs[0]
+			}
+			break
+		}
+	}
+
+	buildExprs(where.Exprs, builder, AndWithSpace)
+}
+
+func buildExprs(exprs []Expression, builder Builder, joinCond string) {
+	wrapInParentheses := false
+
+	for idx, expr := range exprs {
+		if idx > 0 {
+			if v, ok := expr.(OrConditions); ok && len(v.Exprs) == 1 {
+				builder.WriteString(OrWithSpace)
+			} else {
+				builder.WriteString(joinCond)
+			}
+		}
+
+		if len(exprs) > 1 {
+			switch v := expr.(type) {
+			case OrConditions:
+				if len(v.Exprs) == 1 {
+					if e, ok := v.Exprs[0].(Expr); ok {
+						sql := strings.ToUpper(e.SQL)
+						wrapInParentheses = strings.Contains(sql, AndWithSpace) || strings.Contains(sql, OrWithSpace)
+					}
+				}
+			case AndConditions:
+				if len(v.Exprs) == 1 {
+					if e, ok := v.Exprs[0].(Expr); ok {
+						sql := strings.ToUpper(e.SQL)
+						wrapInParentheses = strings.Contains(sql, AndWithSpace) || strings.Contains(sql, OrWithSpace)
+					}
+				}
+			case Expr:
+				sql := strings.ToUpper(v.SQL)
+				wrapInParentheses = strings.Contains(sql, AndWithSpace) || strings.Contains(sql, OrWithSpace)
+			case NamedExpr:
+				sql := strings.ToUpper(v.SQL)
+				wrapInParentheses = strings.Contains(sql, AndWithSpace) || strings.Contains(sql, OrWithSpace)
+			}
+		}
+
+		if wrapInParentheses {
+			builder.WriteByte('(')
+			expr.Build(builder)
+			builder.WriteByte(')')
+			wrapInParentheses = false
+		} else {
+			expr.Build(builder)
+		}
+	}
+}
+
+// MergeClause merge where clauses
+func (where Where) MergeClause(clause *Clause) {
+	if w, ok := clause.Expression.(Where); ok {
+		exprs := make([]Expression, len(w.Exprs)+len(where.Exprs))
+		copy(exprs, w.Exprs)
+		copy(exprs[len(w.Exprs):], where.Exprs)
+		where.Exprs = exprs
+	}
+
+	clause.Expression = where
+}
+
+func And(exprs ...Expression) Expression {
+	if len(exprs) == 0 {
+		return nil
+	}
+
+	if len(exprs) == 1 {
+		if _, ok := exprs[0].(OrConditions); !ok {
+			return exprs[0]
+		}
+	}
+
+	return AndConditions{Exprs: exprs}
+}
+
+type AndConditions struct {
+	Exprs []Expression
+}
+
+func (and AndConditions) Build(builder Builder) {
+	if len(and.Exprs) > 1 {
+		builder.WriteByte('(')
+		buildExprs(and.Exprs, builder, AndWithSpace)
+		builder.WriteByte(')')
+	} else {
+		buildExprs(and.Exprs, builder, AndWithSpace)
+	}
+}
+
+func Or(exprs ...Expression) Expression {
+	if len(exprs) == 0 {
+		return nil
+	}
+	return OrConditions{Exprs: exprs}
+}
+
+type OrConditions struct {
+	Exprs []Expression
+}
+
+func (or OrConditions) Build(builder Builder) {
+	if len(or.Exprs) > 1 {
+		builder.WriteByte('(')
+		buildExprs(or.Exprs, builder, OrWithSpace)
+		builder.WriteByte(')')
+	} else {
+		buildExprs(or.Exprs, builder, OrWithSpace)
+	}
+}
+
+func Not(exprs ...Expression) Expression {
+	if len(exprs) == 0 {
+		return nil
+	}
+	if len(exprs) == 1 {
+		if andCondition, ok := exprs[0].(AndConditions); ok {
+			exprs = andCondition.Exprs
+		}
+	}
+	return NotConditions{Exprs: exprs}
+}
+
+type NotConditions struct {
+	Exprs []Expression
+}
+
+func (not NotConditions) Build(builder Builder) {
+	if len(not.Exprs) > 1 {
+		builder.WriteByte('(')
+	}
+
+	for idx, c := range not.Exprs {
+		if idx > 0 {
+			builder.WriteString(AndWithSpace)
+		}
+
+		if negationBuilder, ok := c.(NegationExpressionBuilder); ok {
+			negationBuilder.NegationBuild(builder)
+		} else {
+			builder.WriteString("NOT ")
+			e, wrapInParentheses := c.(Expr)
+			if wrapInParentheses {
+				sql := strings.ToUpper(e.SQL)
+				if wrapInParentheses = strings.Contains(sql, AndWithSpace) || strings.Contains(sql, OrWithSpace); wrapInParentheses {
+					builder.WriteByte('(')
+				}
+			}
+
+			c.Build(builder)
+
+			if wrapInParentheses {
+				builder.WriteByte(')')
+			}
+		}
+	}
+
+	if len(not.Exprs) > 1 {
+		builder.WriteByte(')')
+	}
+}

vendor/gorm.io/gorm/clause/with.go

@@ -0,0 +1,3 @@
+package clause
+
+type With struct{}