1. 实现配置文件解析

2. 实现数据库连接

vendor/gorm.io/gorm/soft_delete.go

@@ -0,0 +1,170 @@
+package gorm
+
+import (
+	"database/sql"
+	"database/sql/driver"
+	"encoding/json"
+	"reflect"
+
+	"github.com/jinzhu/now"
+	"gorm.io/gorm/clause"
+	"gorm.io/gorm/schema"
+)
+
+type DeletedAt sql.NullTime
+
+// Scan implements the Scanner interface.
+func (n *DeletedAt) Scan(value interface{}) error {
+	return (*sql.NullTime)(n).Scan(value)
+}
+
+// Value implements the driver Valuer interface.
+func (n DeletedAt) Value() (driver.Value, error) {
+	if !n.Valid {
+		return nil, nil
+	}
+	return n.Time, nil
+}
+
+func (n DeletedAt) MarshalJSON() ([]byte, error) {
+	if n.Valid {
+		return json.Marshal(n.Time)
+	}
+	return json.Marshal(nil)
+}
+
+func (n *DeletedAt) UnmarshalJSON(b []byte) error {
+	if string(b) == "null" {
+		n.Valid = false
+		return nil
+	}
+	err := json.Unmarshal(b, &n.Time)
+	if err == nil {
+		n.Valid = true
+	}
+	return err
+}
+
+func (DeletedAt) QueryClauses(f *schema.Field) []clause.Interface {
+	return []clause.Interface{SoftDeleteQueryClause{Field: f, ZeroValue: parseZeroValueTag(f)}}
+}
+
+func parseZeroValueTag(f *schema.Field) sql.NullString {
+	if v, ok := f.TagSettings["ZEROVALUE"]; ok {
+		if _, err := now.Parse(v); err == nil {
+			return sql.NullString{String: v, Valid: true}
+		}
+	}
+	return sql.NullString{Valid: false}
+}
+
+type SoftDeleteQueryClause struct {
+	ZeroValue sql.NullString
+	Field     *schema.Field
+}
+
+func (sd SoftDeleteQueryClause) Name() string {
+	return ""
+}
+
+func (sd SoftDeleteQueryClause) Build(clause.Builder) {
+}
+
+func (sd SoftDeleteQueryClause) MergeClause(*clause.Clause) {
+}
+
+func (sd SoftDeleteQueryClause) ModifyStatement(stmt *Statement) {
+	if _, ok := stmt.Clauses["soft_delete_enabled"]; !ok && !stmt.Statement.Unscoped {
+		if c, ok := stmt.Clauses["WHERE"]; ok {
+			if where, ok := c.Expression.(clause.Where); ok && len(where.Exprs) >= 1 {
+				for _, expr := range where.Exprs {
+					if orCond, ok := expr.(clause.OrConditions); ok && len(orCond.Exprs) == 1 {
+						where.Exprs = []clause.Expression{clause.And(where.Exprs...)}
+						c.Expression = where
+						stmt.Clauses["WHERE"] = c
+						break
+					}
+				}
+			}
+		}
+
+		stmt.AddClause(clause.Where{Exprs: []clause.Expression{
+			clause.Eq{Column: clause.Column{Table: clause.CurrentTable, Name: sd.Field.DBName}, Value: sd.ZeroValue},
+		}})
+		stmt.Clauses["soft_delete_enabled"] = clause.Clause{}
+	}
+}
+
+func (DeletedAt) UpdateClauses(f *schema.Field) []clause.Interface {
+	return []clause.Interface{SoftDeleteUpdateClause{Field: f, ZeroValue: parseZeroValueTag(f)}}
+}
+
+type SoftDeleteUpdateClause struct {
+	ZeroValue sql.NullString
+	Field     *schema.Field
+}
+
+func (sd SoftDeleteUpdateClause) Name() string {
+	return ""
+}
+
+func (sd SoftDeleteUpdateClause) Build(clause.Builder) {
+}
+
+func (sd SoftDeleteUpdateClause) MergeClause(*clause.Clause) {
+}
+
+func (sd SoftDeleteUpdateClause) ModifyStatement(stmt *Statement) {
+	if stmt.SQL.Len() == 0 && !stmt.Statement.Unscoped {
+		SoftDeleteQueryClause(sd).ModifyStatement(stmt)
+	}
+}
+
+func (DeletedAt) DeleteClauses(f *schema.Field) []clause.Interface {
+	return []clause.Interface{SoftDeleteDeleteClause{Field: f, ZeroValue: parseZeroValueTag(f)}}
+}
+
+type SoftDeleteDeleteClause struct {
+	ZeroValue sql.NullString
+	Field     *schema.Field
+}
+
+func (sd SoftDeleteDeleteClause) Name() string {
+	return ""
+}
+
+func (sd SoftDeleteDeleteClause) Build(clause.Builder) {
+}
+
+func (sd SoftDeleteDeleteClause) MergeClause(*clause.Clause) {
+}
+
+func (sd SoftDeleteDeleteClause) ModifyStatement(stmt *Statement) {
+	if stmt.SQL.Len() == 0 && !stmt.Statement.Unscoped {
+		curTime := stmt.DB.NowFunc()
+		stmt.AddClause(clause.Set{{Column: clause.Column{Name: sd.Field.DBName}, Value: curTime}})
+		stmt.SetColumn(sd.Field.DBName, curTime, true)
+
+		if stmt.Schema != nil {
+			_, queryValues := schema.GetIdentityFieldValuesMap(stmt.Context, stmt.ReflectValue, stmt.Schema.PrimaryFields)
+			column, values := schema.ToQueryValues(stmt.Table, stmt.Schema.PrimaryFieldDBNames, queryValues)
+
+			if len(values) > 0 {
+				stmt.AddClause(clause.Where{Exprs: []clause.Expression{clause.IN{Column: column, Values: values}}})
+			}
+
+			if stmt.ReflectValue.CanAddr() && stmt.Dest != stmt.Model && stmt.Model != nil {
+				_, queryValues = schema.GetIdentityFieldValuesMap(stmt.Context, reflect.ValueOf(stmt.Model), stmt.Schema.PrimaryFields)
+				column, values = schema.ToQueryValues(stmt.Table, stmt.Schema.PrimaryFieldDBNames, queryValues)
+
+				if len(values) > 0 {
+					stmt.AddClause(clause.Where{Exprs: []clause.Expression{clause.IN{Column: column, Values: values}}})
+				}
+			}
+		}
+
+		SoftDeleteQueryClause(sd).ModifyStatement(stmt)
+		stmt.AddClauseIfNotExists(clause.Update{})
+		stmt.Build(stmt.DB.Callback().Update().Clauses...)
+	}
+}