mirror of https://github.com/go-gorm/gorm.git
115 lines
2.9 KiB
Go
115 lines
2.9 KiB
Go
package gorm
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import (
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"fmt"
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"reflect"
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"strings"
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"time"
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)
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type mssql struct {
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commonDialect
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}
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func init() {
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RegisterDialect("mssql", &mssql{})
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}
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func (mssql) DataTypeOf(field *StructField) string {
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var dataValue, sqlType, size, additionalType = ParseFieldStructForDialect(field)
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if sqlType == "" {
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switch dataValue.Kind() {
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case reflect.Bool:
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sqlType = "bit"
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uintptr:
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if _, ok := field.TagSettings["AUTO_INCREMENT"]; ok || field.IsPrimaryKey {
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sqlType = "int IDENTITY(1,1)"
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} else {
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sqlType = "int"
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}
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case reflect.Int64, reflect.Uint64:
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if _, ok := field.TagSettings["AUTO_INCREMENT"]; ok || field.IsPrimaryKey {
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sqlType = "bigint IDENTITY(1,1)"
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} else {
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sqlType = "bigint"
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}
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case reflect.Float32, reflect.Float64:
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sqlType = "float"
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case reflect.String:
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if size > 0 && size < 65532 {
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sqlType = fmt.Sprintf("nvarchar(%d)", size)
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} else {
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sqlType = "text"
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}
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case reflect.Struct:
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if _, ok := dataValue.Interface().(time.Time); ok {
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sqlType = "datetime2"
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}
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default:
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if _, ok := dataValue.Interface().([]byte); ok {
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if size > 0 && size < 65532 {
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sqlType = fmt.Sprintf("varchar(%d)", size)
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} else {
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sqlType = "text"
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}
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}
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}
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}
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if sqlType == "" {
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panic(fmt.Sprintf("invalid sql type %s (%s) for mssql", dataValue.Type().Name(), dataValue.Kind().String()))
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}
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if strings.TrimSpace(additionalType) == "" {
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return sqlType
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}
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return fmt.Sprintf("%v %v", sqlType, additionalType)
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}
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func (s mssql) HasIndex(scope *Scope, tableName string, indexName string) bool {
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var count int
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s.RawScanInt(scope, &count, "SELECT count(*) FROM sys.indexes WHERE name=? AND object_id=OBJECT_ID(?)", indexName, tableName)
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return count > 0
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}
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func (s mssql) HasTable(scope *Scope, tableName string) bool {
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var (
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count int
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databaseName = s.currentDatabase(scope)
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)
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s.RawScanInt(scope, &count, "SELECT count(*) FROM INFORMATION_SCHEMA.tables WHERE table_name = ? AND table_catalog = ?", tableName, databaseName)
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return count > 0
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}
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func (s mssql) HasColumn(scope *Scope, tableName string, columnName string) bool {
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var (
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count int
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databaseName = s.currentDatabase(scope)
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)
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s.RawScanInt(scope, &count, "SELECT count(*) FROM information_schema.columns WHERE table_catalog = ? AND table_name = ? AND column_name = ?", databaseName, tableName, columnName)
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return count > 0
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}
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func (s mssql) currentDatabase(scope *Scope) (name string) {
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s.RawScanString(scope, &name, "SELECT DB_NAME() AS [Current Database]")
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return
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}
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func (mssql) LimitAndOffsetSQL(limit, offset int) (sql string) {
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if limit < 0 && offset < 0 {
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return
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}
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if offset < 0 {
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offset = 0
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}
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sql += fmt.Sprintf(" OFFSET %d ROWS", offset)
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if limit >= 0 {
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sql += fmt.Sprintf(" FETCH NEXT %d ROWS ONLY", limit)
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}
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return
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}
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