113 lines
3.1 KiB
Go
113 lines
3.1 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 redshift struct {
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commonDialect
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}
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func init() {
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RegisterDialect("redshift", &redshift{})
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}
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func (redshift) GetName() string {
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return "redshift"
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}
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func (redshift) BindVar(i int) string {
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return fmt.Sprintf("$%v", i)
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}
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func (redshift) 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 = "boolean"
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case reflect.Float32:
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sqlType = "float4"
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case reflect.Float64:
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sqlType = "float8"
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32:
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if _, ok := field.TagSettings["AUTO_INCREMENT"]; field.IsPrimaryKey || ok {
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sqlType = "integer DISTKEY IDENTITY(1, 1)"
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} else {
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sqlType = "integer"
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}
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case reflect.Int64, reflect.Uintptr, reflect.Uint64:
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if _, ok := field.TagSettings["AUTO_INCREMENT"]; field.IsPrimaryKey || ok {
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sqlType = "bigint DISTKEY IDENTITY(1, 1)"
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} else {
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sqlType = "bigint"
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}
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case reflect.String:
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if _, ok := field.TagSettings["SIZE"]; !ok {
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size = 0 // if SIZE haven't been set, use `text` as the default type, as there are no performance different
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}
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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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case reflect.Struct:
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if _, ok := dataValue.Interface().(time.Time); ok {
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sqlType = "timestamp with time zone"
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}
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default:
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sqlType = ""
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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 redshift", 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 redshift) HasIndex(tableName string, indexName string) bool {
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var count int
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s.db.QueryRow("SELECT count(*) FROM pg_indexes WHERE tablename = $1 AND indexname = $2", tableName, indexName).Scan(&count)
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return count > 0
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}
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func (s redshift) HasForeignKey(tableName string, foreignKeyName string) bool {
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var count int
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s.db.QueryRow("SELECT count(con.conname) FROM pg_constraint con WHERE $1::regclass::oid = con.conrelid AND con.conname = $2 AND con.contype='f'", tableName, foreignKeyName).Scan(&count)
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return count > 0
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}
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func (s redshift) HasTable(tableName string) bool {
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var count int
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s.db.QueryRow("SELECT count(*) FROM INFORMATION_SCHEMA.tables WHERE table_name = $1 AND table_type = 'BASE TABLE'", tableName).Scan(&count)
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return count > 0
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}
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func (s redshift) HasColumn(tableName string, columnName string) bool {
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var count int
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s.db.QueryRow("SELECT count(*) FROM INFORMATION_SCHEMA.columns WHERE table_name = $1 AND column_name = $2", tableName, columnName).Scan(&count)
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return count > 0
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}
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func (s redshift) CurrentDatabase() (name string) {
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s.db.QueryRow("SELECT CURRENT_DATABASE()").Scan(&name)
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return
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}
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func (s redshift) LastInsertIDReturningSuffix(tableName, key string) string {
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return ""
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}
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func (redshift) SupportLastInsertID() bool {
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return false
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}
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