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Add method HasTable, HasColumn to dialect

This commit is contained in:
Jinzhu 2014-04-25 09:08:48 +08:00
parent 288c8e37af
commit 66e6c9af9f
5 changed files with 63 additions and 26 deletions
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2
dialect.go
View File

@ -14,6 +14,8 @@ type Dialect interface {
PrimaryKeyTag(value reflect.Value, size int) string
ReturningStr(key string) string
Quote(key string) string
HasTable(scope *Scope, tableName string) bool
HasColumn(scope *Scope, tableName string, columnName string) bool
}
func NewDialect(driver string) Dialect {

19
mysql.go
View File

@ -68,10 +68,21 @@ func (s *mysql) Quote(key string) string {
return fmt.Sprintf("`%s`", key)
}
func (s *mysql) HasTable(tableName string) bool {
return true
func (s *mysql) HasTable(scope *Scope, tableName string) bool {
var count int
newScope := scope.New(nil)
newScope.Raw(fmt.Sprintf("SELECT count(*) FROM INFORMATION_SCHEMA.tables where table_name = %v", newScope.AddToVars(tableName)))
newScope.DB().QueryRow(newScope.Sql, newScope.SqlVars...).Scan(&count)
return count > 0
}
func (s *mysql) HasColumn(tableName string, columnName string) bool {
return true
func (s *mysql) HasColumn(scope *Scope, tableName string, columnName string) bool {
var count int
newScope := scope.New(nil)
newScope.Raw(fmt.Sprintf("SELECT count(*) FROM information_schema.columns WHERE table_name = %v AND column_name = %v",
newScope.AddToVars(tableName),
newScope.AddToVars(columnName),
))
newScope.DB().QueryRow(newScope.Sql, newScope.SqlVars...).Scan(&count)
return count > 0
}

19
postgres.go
View File

@ -61,3 +61,22 @@ func (s *postgres) ReturningStr(key string) string {
func (s *postgres) Quote(key string) string {
return fmt.Sprintf("\"%s\"", key)
}
func (s *postgres) HasTable(scope *Scope, tableName string) bool {
var count int
newScope := scope.New(nil)
newScope.Raw(fmt.Sprintf("SELECT count(*) FROM INFORMATION_SCHEMA.tables where table_name = %v", newScope.AddToVars(tableName)))
newScope.DB().QueryRow(newScope.Sql, newScope.SqlVars...).Scan(&count)
return count > 0
}
func (s *postgres) HasColumn(scope *Scope, tableName string, columnName string) bool {
var count int
newScope := scope.New(nil)
newScope.Raw(fmt.Sprintf("SELECT count(*) FROM information_schema.columns WHERE table_name = %v AND column_name = %v",
newScope.AddToVars(tableName),
newScope.AddToVars(columnName),
))
newScope.DB().QueryRow(newScope.Sql, newScope.SqlVars...).Scan(&count)
return count > 0
}

22
scope_private.go
View File

@ -447,31 +447,17 @@ func (scope *Scope) removeIndex(indexName string) {
}
func (scope *Scope) autoMigrate() *Scope {
var tableName string
scope.Raw(fmt.Sprintf("SELECT table_name FROM INFORMATION_SCHEMA.tables where table_name = %v",
scope.AddToVars(scope.TableName())))
scope.DB().QueryRow(scope.Sql, scope.SqlVars...).Scan(&tableName)
scope.SqlVars = []interface{}{}
// If table doesn't exist
if len(tableName) == 0 {
if !scope.Dialect().HasTable(scope, scope.TableName()) {
scope.createTable()
} else {
for _, field := range scope.Fields() {
var column, data string
scope.Raw(fmt.Sprintf("SELECT column_name, data_type FROM information_schema.columns WHERE table_name = %v AND column_name = %v",
scope.AddToVars(scope.TableName()),
scope.AddToVars(field.DBName),
))
scope.DB().QueryRow(scope.Sql, scope.SqlVars...).Scan(&column, &data)
scope.SqlVars = []interface{}{}
// If column doesn't exist
if len(column) == 0 && len(field.SqlTag) > 0 && !field.IsIgnored {
if !scope.Dialect().HasColumn(scope, scope.TableName(), field.DBName) {
if len(field.SqlTag) > 0 && !field.IsIgnored {
scope.Raw(fmt.Sprintf("ALTER TABLE %v ADD %v %v;", scope.TableName(), field.DBName, field.SqlTag)).Exec()
}
}
}
}
return scope
}

25
sqlite3.go
View File

@ -52,10 +52,29 @@ func (s *sqlite3) PrimaryKeyTag(value reflect.Value, size int) string {
}
}
func (s *sqlite3) ReturningStr(key string) (str string) {
return
func (s *sqlite3) ReturningStr(key string) string {
return ""
}
func (s *sqlite3) Quote(key string) (str string) {
func (s *sqlite3) Quote(key string) string {
return fmt.Sprintf("\"%s\"", key)
}
func (s *sqlite3) HasTable(scope *Scope, tableName string) bool {
var count int
newScope := scope.New(nil)
newScope.Raw(fmt.Sprintf("SELECT count(*) FROM INFORMATION_SCHEMA.tables where table_name = %v", newScope.AddToVars(tableName)))
newScope.DB().QueryRow(newScope.Sql, newScope.SqlVars...).Scan(&count)
return count > 0
}
func (s *sqlite3) HasColumn(scope *Scope, tableName string, columnName string) bool {
var count int
newScope := scope.New(nil)
newScope.Raw(fmt.Sprintf("SELECT count(*) FROM information_schema.columns WHERE table_name = %v AND column_name = %v",
newScope.AddToVars(tableName),
newScope.AddToVars(columnName),
))
newScope.DB().QueryRow(newScope.Sql, newScope.SqlVars...).Scan(&count)
return count > 0
}