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Insert initial values only when there is no data in the table #199

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Insert initial values only when there is no data in the table #199

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561aeb9
Insert initial values only when there is no data in the table
AllenGit Aug 14, 2025
cceddea
Insert initial values only when there is no data in the table
AllenGit Aug 14, 2025
c0b7b3b
Insert initial values only when there is no data in the table
AllenGit Aug 14, 2025
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15 changes: 12 additions & 3 deletions primary_key.go
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Original file line number Diff line number Diff line change
Expand Up @@ -56,9 +56,18 @@ func (s *Sharding) createMySQLSequenceKeyIfNotExist(tableName string) error {
if stmt.Error != nil {
return fmt.Errorf("failed to create sequence table: %w", stmt.Error)
}
stmt = s.DB.Exec("INSERT INTO `" + mySQLSeqName(tableName) + "` VALUES (0)")
if stmt.Error != nil {
return fmt.Errorf("failed to insert into sequence table: %w", stmt.Error)
var count int
err := s.DB.Raw("SELECT COUNT(*) FROM `" + mySQLSeqName(tableName) + "`").Scan(&count).Error
if err != nil {
return fmt.Errorf("failed to check sequence table data: %w", err)
}

// Insert initial values only when there is no data in the table
if count == 0 {
stmt = s.DB.Exec("INSERT INTO `" + mySQLSeqName(tableName) + "` VALUES (0)")
if stmt.Error != nil {
return fmt.Errorf("failed to insert into sequence table: %w", stmt.Error)
}
}
return nil
}
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