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migrator.go
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migrator.go
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package mssql
import (
"fmt"
"gorm.io/gorm"
"gorm.io/gorm/clause"
"gorm.io/gorm/migrator"
)
type Migrator struct {
migrator.Migrator
}
func (m Migrator) HasTable(value interface{}) bool {
var count int
m.RunWithValue(value, func(stmt *gorm.Statement) error {
return m.DB.Raw(
"SELECT count(*) FROM INFORMATION_SCHEMA.tables WHERE table_name = ? AND table_catalog = ?",
stmt.Table, m.CurrentDatabase(),
).Row().Scan(&count)
})
return count > 0
}
func (m Migrator) RenameTable(oldName, newName interface{}) error {
var oldTable, newTable string
if v, ok := oldName.(string); ok {
oldTable = v
} else {
stmt := &gorm.Statement{DB: m.DB}
if err := stmt.Parse(oldName); err == nil {
oldTable = stmt.Table
} else {
return err
}
}
if v, ok := newName.(string); ok {
newTable = v
} else {
stmt := &gorm.Statement{DB: m.DB}
if err := stmt.Parse(newName); err == nil {
newTable = stmt.Table
} else {
return err
}
}
return m.DB.Exec(
"sp_rename @objname = ?, @newname = ?;",
clause.Table{Name: oldTable}, clause.Table{Name: newTable},
).Error
}
func (m Migrator) HasColumn(value interface{}, field string) bool {
var count int64
m.RunWithValue(value, func(stmt *gorm.Statement) error {
currentDatabase := m.DB.Migrator().CurrentDatabase()
name := field
if field := stmt.Schema.LookUpField(field); field != nil {
name = field.DBName
}
return m.DB.Raw(
"SELECT count(*) FROM INFORMATION_SCHEMA.columns WHERE table_catalog = ? AND table_name = ? AND column_name = ?",
currentDatabase, stmt.Table, name,
).Row().Scan(&count)
})
return count > 0
}
func (m Migrator) AlterColumn(value interface{}, field string) error {
return m.RunWithValue(value, func(stmt *gorm.Statement) error {
if field := stmt.Schema.LookUpField(field); field != nil {
return m.DB.Exec(
"ALTER TABLE ? ALTER COLUMN ? ?",
clause.Table{Name: stmt.Table}, clause.Column{Name: field.DBName}, m.FullDataTypeOf(field),
).Error
}
return fmt.Errorf("failed to look up field with name: %s", field)
})
}
func (m Migrator) RenameColumn(value interface{}, oldName, newName string) error {
return m.RunWithValue(value, func(stmt *gorm.Statement) error {
if field := stmt.Schema.LookUpField(oldName); field != nil {
oldName = field.DBName
}
if field := stmt.Schema.LookUpField(newName); field != nil {
newName = field.DBName
}
return m.DB.Exec(
"sp_rename @objname = ?, @newname = ?, @objtype = 'COLUMN';",
fmt.Sprintf("%s.%s", stmt.Table, oldName), clause.Column{Name: newName},
).Error
})
}
func (m Migrator) HasIndex(value interface{}, name string) bool {
var count int
m.RunWithValue(value, func(stmt *gorm.Statement) error {
if idx := stmt.Schema.LookIndex(name); idx != nil {
name = idx.Name
}
return m.DB.Raw(
"SELECT count(*) FROM sys.indexes WHERE name=? AND object_id=OBJECT_ID(?)",
name, stmt.Table,
).Row().Scan(&count)
})
return count > 0
}
func (m Migrator) RenameIndex(value interface{}, oldName, newName string) error {
return m.RunWithValue(value, func(stmt *gorm.Statement) error {
return m.DB.Exec(
"sp_rename @objname = ?, @newname = ?, @objtype = 'INDEX';",
fmt.Sprintf("%s.%s", stmt.Table, oldName), clause.Column{Name: newName},
).Error
})
}
func (m Migrator) HasConstraint(value interface{}, name string) bool {
var count int64
m.RunWithValue(value, func(stmt *gorm.Statement) error {
return m.DB.Raw(
`SELECT count(*) FROM sys.foreign_keys as F inner join sys.tables as T on F.parent_object_id=T.object_id inner join information_schema.tables as I on I.TABLE_NAME = T.name WHERE F.name = ? AND T.Name = ? AND I.TABLE_CATALOG = ?;`,
name, stmt.Table, m.CurrentDatabase(),
).Row().Scan(&count)
})
return count > 0
}
func (m Migrator) CurrentDatabase() (name string) {
m.DB.Raw("SELECT DB_NAME() AS [Current Database]").Row().Scan(&name)
return
}