fathom/vendor/gopkg.in/gorp.v1/dialect.go

693 lines
17 KiB
Go

package gorp
import (
"errors"
"fmt"
"reflect"
"strings"
)
// The Dialect interface encapsulates behaviors that differ across
// SQL databases. At present the Dialect is only used by CreateTables()
// but this could change in the future
type Dialect interface {
// adds a suffix to any query, usually ";"
QuerySuffix() string
// ToSqlType returns the SQL column type to use when creating a
// table of the given Go Type. maxsize can be used to switch based on
// size. For example, in MySQL []byte could map to BLOB, MEDIUMBLOB,
// or LONGBLOB depending on the maxsize
ToSqlType(val reflect.Type, maxsize int, isAutoIncr bool) string
// string to append to primary key column definitions
AutoIncrStr() string
// string to bind autoincrement columns to. Empty string will
// remove reference to those columns in the INSERT statement.
AutoIncrBindValue() string
AutoIncrInsertSuffix(col *ColumnMap) string
// string to append to "create table" statement for vendor specific
// table attributes
CreateTableSuffix() string
// string to truncate tables
TruncateClause() string
// bind variable string to use when forming SQL statements
// in many dbs it is "?", but Postgres appears to use $1
//
// i is a zero based index of the bind variable in this statement
//
BindVar(i int) string
// Handles quoting of a field name to ensure that it doesn't raise any
// SQL parsing exceptions by using a reserved word as a field name.
QuoteField(field string) string
// Handles building up of a schema.database string that is compatible with
// the given dialect
//
// schema - The schema that <table> lives in
// table - The table name
QuotedTableForQuery(schema string, table string) string
// Existance clause for table creation / deletion
IfSchemaNotExists(command, schema string) string
IfTableExists(command, schema, table string) string
IfTableNotExists(command, schema, table string) string
}
// IntegerAutoIncrInserter is implemented by dialects that can perform
// inserts with automatically incremented integer primary keys. If
// the dialect can handle automatic assignment of more than just
// integers, see TargetedAutoIncrInserter.
type IntegerAutoIncrInserter interface {
InsertAutoIncr(exec SqlExecutor, insertSql string, params ...interface{}) (int64, error)
}
// TargetedAutoIncrInserter is implemented by dialects that can
// perform automatic assignment of any primary key type (i.e. strings
// for uuids, integers for serials, etc).
type TargetedAutoIncrInserter interface {
// InsertAutoIncrToTarget runs an insert operation and assigns the
// automatically generated primary key directly to the passed in
// target. The target should be a pointer to the primary key
// field of the value being inserted.
InsertAutoIncrToTarget(exec SqlExecutor, insertSql string, target interface{}, params ...interface{}) error
}
func standardInsertAutoIncr(exec SqlExecutor, insertSql string, params ...interface{}) (int64, error) {
res, err := exec.Exec(insertSql, params...)
if err != nil {
return 0, err
}
return res.LastInsertId()
}
///////////////////////////////////////////////////////
// sqlite3 //
/////////////
type SqliteDialect struct {
suffix string
}
func (d SqliteDialect) QuerySuffix() string { return ";" }
func (d SqliteDialect) ToSqlType(val reflect.Type, maxsize int, isAutoIncr bool) string {
switch val.Kind() {
case reflect.Ptr:
return d.ToSqlType(val.Elem(), maxsize, isAutoIncr)
case reflect.Bool:
return "integer"
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
return "integer"
case reflect.Float64, reflect.Float32:
return "real"
case reflect.Slice:
if val.Elem().Kind() == reflect.Uint8 {
return "blob"
}
}
switch val.Name() {
case "NullInt64":
return "integer"
case "NullFloat64":
return "real"
case "NullBool":
return "integer"
case "Time":
return "datetime"
}
if maxsize < 1 {
maxsize = 255
}
return fmt.Sprintf("varchar(%d)", maxsize)
}
// Returns autoincrement
func (d SqliteDialect) AutoIncrStr() string {
return "autoincrement"
}
func (d SqliteDialect) AutoIncrBindValue() string {
return "null"
}
func (d SqliteDialect) AutoIncrInsertSuffix(col *ColumnMap) string {
return ""
}
// Returns suffix
func (d SqliteDialect) CreateTableSuffix() string {
return d.suffix
}
// With sqlite, there technically isn't a TRUNCATE statement,
// but a DELETE FROM uses a truncate optimization:
// http://www.sqlite.org/lang_delete.html
func (d SqliteDialect) TruncateClause() string {
return "delete from"
}
// Returns "?"
func (d SqliteDialect) BindVar(i int) string {
return "?"
}
func (d SqliteDialect) InsertAutoIncr(exec SqlExecutor, insertSql string, params ...interface{}) (int64, error) {
return standardInsertAutoIncr(exec, insertSql, params...)
}
func (d SqliteDialect) QuoteField(f string) string {
return `"` + f + `"`
}
// sqlite does not have schemas like PostgreSQL does, so just escape it like normal
func (d SqliteDialect) QuotedTableForQuery(schema string, table string) string {
return d.QuoteField(table)
}
func (d SqliteDialect) IfSchemaNotExists(command, schema string) string {
return fmt.Sprintf("%s if not exists", command)
}
func (d SqliteDialect) IfTableExists(command, schema, table string) string {
return fmt.Sprintf("%s if exists", command)
}
func (d SqliteDialect) IfTableNotExists(command, schema, table string) string {
return fmt.Sprintf("%s if not exists", command)
}
///////////////////////////////////////////////////////
// PostgreSQL //
////////////////
type PostgresDialect struct {
suffix string
}
func (d PostgresDialect) QuerySuffix() string { return ";" }
func (d PostgresDialect) ToSqlType(val reflect.Type, maxsize int, isAutoIncr bool) string {
switch val.Kind() {
case reflect.Ptr:
return d.ToSqlType(val.Elem(), maxsize, isAutoIncr)
case reflect.Bool:
return "boolean"
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Uint8, reflect.Uint16, reflect.Uint32:
if isAutoIncr {
return "serial"
}
return "integer"
case reflect.Int64, reflect.Uint64:
if isAutoIncr {
return "bigserial"
}
return "bigint"
case reflect.Float64:
return "double precision"
case reflect.Float32:
return "real"
case reflect.Slice:
if val.Elem().Kind() == reflect.Uint8 {
return "bytea"
}
}
switch val.Name() {
case "NullInt64":
return "bigint"
case "NullFloat64":
return "double precision"
case "NullBool":
return "boolean"
case "Time":
return "timestamp with time zone"
}
if maxsize > 0 {
return fmt.Sprintf("varchar(%d)", maxsize)
} else {
return "text"
}
}
// Returns empty string
func (d PostgresDialect) AutoIncrStr() string {
return ""
}
func (d PostgresDialect) AutoIncrBindValue() string {
return "default"
}
func (d PostgresDialect) AutoIncrInsertSuffix(col *ColumnMap) string {
return " returning " + col.ColumnName
}
// Returns suffix
func (d PostgresDialect) CreateTableSuffix() string {
return d.suffix
}
func (d PostgresDialect) TruncateClause() string {
return "truncate"
}
// Returns "$(i+1)"
func (d PostgresDialect) BindVar(i int) string {
return fmt.Sprintf("$%d", i+1)
}
func (d PostgresDialect) InsertAutoIncrToTarget(exec SqlExecutor, insertSql string, target interface{}, params ...interface{}) error {
rows, err := exec.query(insertSql, params...)
if err != nil {
return err
}
defer rows.Close()
if rows.Next() {
err := rows.Scan(target)
return err
}
return errors.New("No serial value returned for insert: " + insertSql + " Encountered error: " + rows.Err().Error())
}
func (d PostgresDialect) QuoteField(f string) string {
return `"` + strings.ToLower(f) + `"`
}
func (d PostgresDialect) QuotedTableForQuery(schema string, table string) string {
if strings.TrimSpace(schema) == "" {
return d.QuoteField(table)
}
return schema + "." + d.QuoteField(table)
}
func (d PostgresDialect) IfSchemaNotExists(command, schema string) string {
return fmt.Sprintf("%s if not exists", command)
}
func (d PostgresDialect) IfTableExists(command, schema, table string) string {
return fmt.Sprintf("%s if exists", command)
}
func (d PostgresDialect) IfTableNotExists(command, schema, table string) string {
return fmt.Sprintf("%s if not exists", command)
}
///////////////////////////////////////////////////////
// MySQL //
///////////
// Implementation of Dialect for MySQL databases.
type MySQLDialect struct {
// Engine is the storage engine to use "InnoDB" vs "MyISAM" for example
Engine string
// Encoding is the character encoding to use for created tables
Encoding string
}
func (d MySQLDialect) QuerySuffix() string { return ";" }
func (d MySQLDialect) ToSqlType(val reflect.Type, maxsize int, isAutoIncr bool) string {
switch val.Kind() {
case reflect.Ptr:
return d.ToSqlType(val.Elem(), maxsize, isAutoIncr)
case reflect.Bool:
return "boolean"
case reflect.Int8:
return "tinyint"
case reflect.Uint8:
return "tinyint unsigned"
case reflect.Int16:
return "smallint"
case reflect.Uint16:
return "smallint unsigned"
case reflect.Int, reflect.Int32:
return "int"
case reflect.Uint, reflect.Uint32:
return "int unsigned"
case reflect.Int64:
return "bigint"
case reflect.Uint64:
return "bigint unsigned"
case reflect.Float64, reflect.Float32:
return "double"
case reflect.Slice:
if val.Elem().Kind() == reflect.Uint8 {
return "mediumblob"
}
}
switch val.Name() {
case "NullInt64":
return "bigint"
case "NullFloat64":
return "double"
case "NullBool":
return "tinyint"
case "Time":
return "datetime"
}
if maxsize < 1 {
maxsize = 255
}
return fmt.Sprintf("varchar(%d)", maxsize)
}
// Returns auto_increment
func (d MySQLDialect) AutoIncrStr() string {
return "auto_increment"
}
func (d MySQLDialect) AutoIncrBindValue() string {
return "null"
}
func (d MySQLDialect) AutoIncrInsertSuffix(col *ColumnMap) string {
return ""
}
// Returns engine=%s charset=%s based on values stored on struct
func (d MySQLDialect) CreateTableSuffix() string {
if d.Engine == "" || d.Encoding == "" {
msg := "gorp - undefined"
if d.Engine == "" {
msg += " MySQLDialect.Engine"
}
if d.Engine == "" && d.Encoding == "" {
msg += ","
}
if d.Encoding == "" {
msg += " MySQLDialect.Encoding"
}
msg += ". Check that your MySQLDialect was correctly initialized when declared."
panic(msg)
}
return fmt.Sprintf(" engine=%s charset=%s", d.Engine, d.Encoding)
}
func (d MySQLDialect) TruncateClause() string {
return "truncate"
}
// Returns "?"
func (d MySQLDialect) BindVar(i int) string {
return "?"
}
func (d MySQLDialect) InsertAutoIncr(exec SqlExecutor, insertSql string, params ...interface{}) (int64, error) {
return standardInsertAutoIncr(exec, insertSql, params...)
}
func (d MySQLDialect) QuoteField(f string) string {
return "`" + f + "`"
}
func (d MySQLDialect) QuotedTableForQuery(schema string, table string) string {
if strings.TrimSpace(schema) == "" {
return d.QuoteField(table)
}
return schema + "." + d.QuoteField(table)
}
func (d MySQLDialect) IfSchemaNotExists(command, schema string) string {
return fmt.Sprintf("%s if not exists", command)
}
func (d MySQLDialect) IfTableExists(command, schema, table string) string {
return fmt.Sprintf("%s if exists", command)
}
func (d MySQLDialect) IfTableNotExists(command, schema, table string) string {
return fmt.Sprintf("%s if not exists", command)
}
///////////////////////////////////////////////////////
// Sql Server //
////////////////
// Implementation of Dialect for Microsoft SQL Server databases.
// Tested on SQL Server 2008 with driver: github.com/denisenkom/go-mssqldb
type SqlServerDialect struct {
suffix string
}
func (d SqlServerDialect) ToSqlType(val reflect.Type, maxsize int, isAutoIncr bool) string {
switch val.Kind() {
case reflect.Ptr:
return d.ToSqlType(val.Elem(), maxsize, isAutoIncr)
case reflect.Bool:
return "bit"
case reflect.Int8:
return "tinyint"
case reflect.Uint8:
return "smallint"
case reflect.Int16:
return "smallint"
case reflect.Uint16:
return "int"
case reflect.Int, reflect.Int32:
return "int"
case reflect.Uint, reflect.Uint32:
return "bigint"
case reflect.Int64:
return "bigint"
case reflect.Uint64:
return "bigint"
case reflect.Float32:
return "real"
case reflect.Float64:
return "float(53)"
case reflect.Slice:
if val.Elem().Kind() == reflect.Uint8 {
return "varbinary"
}
}
switch val.Name() {
case "NullInt64":
return "bigint"
case "NullFloat64":
return "float(53)"
case "NullBool":
return "tinyint"
case "Time":
return "datetime"
}
if maxsize < 1 {
maxsize = 255
}
return fmt.Sprintf("varchar(%d)", maxsize)
}
// Returns auto_increment
func (d SqlServerDialect) AutoIncrStr() string {
return "identity(0,1)"
}
// Empty string removes autoincrement columns from the INSERT statements.
func (d SqlServerDialect) AutoIncrBindValue() string {
return ""
}
func (d SqlServerDialect) AutoIncrInsertSuffix(col *ColumnMap) string {
return ""
}
// Returns suffix
func (d SqlServerDialect) CreateTableSuffix() string {
return d.suffix
}
func (d SqlServerDialect) TruncateClause() string {
return "delete from"
}
// Returns "?"
func (d SqlServerDialect) BindVar(i int) string {
return "?"
}
func (d SqlServerDialect) InsertAutoIncr(exec SqlExecutor, insertSql string, params ...interface{}) (int64, error) {
return standardInsertAutoIncr(exec, insertSql, params...)
}
func (d SqlServerDialect) QuoteField(f string) string {
return `"` + f + `"`
}
func (d SqlServerDialect) QuotedTableForQuery(schema string, table string) string {
if strings.TrimSpace(schema) == "" {
return table
}
return schema + "." + table
}
func (d SqlServerDialect) QuerySuffix() string { return ";" }
func (d SqlServerDialect) IfSchemaNotExists(command, schema string) string {
s := fmt.Sprintf("if not exists (select name from sys.schemas where name = '%s') %s", schema, command)
return s
}
func (d SqlServerDialect) IfTableExists(command, schema, table string) string {
var schema_clause string
if strings.TrimSpace(schema) != "" {
schema_clause = fmt.Sprintf("table_schema = '%s' and ", schema)
}
s := fmt.Sprintf("if exists (select * from information_schema.tables where %stable_name = '%s') %s", schema_clause, table, command)
return s
}
func (d SqlServerDialect) IfTableNotExists(command, schema, table string) string {
var schema_clause string
if strings.TrimSpace(schema) != "" {
schema_clause = fmt.Sprintf("table_schema = '%s' and ", schema)
}
s := fmt.Sprintf("if not exists (select * from information_schema.tables where %stable_name = '%s') %s", schema_clause, table, command)
return s
}
///////////////////////////////////////////////////////
// Oracle //
///////////
// Implementation of Dialect for Oracle databases.
type OracleDialect struct{}
func (d OracleDialect) QuerySuffix() string { return "" }
func (d OracleDialect) ToSqlType(val reflect.Type, maxsize int, isAutoIncr bool) string {
switch val.Kind() {
case reflect.Ptr:
return d.ToSqlType(val.Elem(), maxsize, isAutoIncr)
case reflect.Bool:
return "boolean"
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Uint8, reflect.Uint16, reflect.Uint32:
if isAutoIncr {
return "serial"
}
return "integer"
case reflect.Int64, reflect.Uint64:
if isAutoIncr {
return "bigserial"
}
return "bigint"
case reflect.Float64:
return "double precision"
case reflect.Float32:
return "real"
case reflect.Slice:
if val.Elem().Kind() == reflect.Uint8 {
return "bytea"
}
}
switch val.Name() {
case "NullInt64":
return "bigint"
case "NullFloat64":
return "double precision"
case "NullBool":
return "boolean"
case "NullTime", "Time":
return "timestamp with time zone"
}
if maxsize > 0 {
return fmt.Sprintf("varchar(%d)", maxsize)
} else {
return "text"
}
}
// Returns empty string
func (d OracleDialect) AutoIncrStr() string {
return ""
}
func (d OracleDialect) AutoIncrBindValue() string {
return "default"
}
func (d OracleDialect) AutoIncrInsertSuffix(col *ColumnMap) string {
return " returning " + col.ColumnName
}
// Returns suffix
func (d OracleDialect) CreateTableSuffix() string {
return ""
}
func (d OracleDialect) TruncateClause() string {
return "truncate"
}
// Returns "$(i+1)"
func (d OracleDialect) BindVar(i int) string {
return fmt.Sprintf(":%d", i+1)
}
func (d OracleDialect) InsertAutoIncr(exec SqlExecutor, insertSql string, params ...interface{}) (int64, error) {
rows, err := exec.query(insertSql, params...)
if err != nil {
return 0, err
}
defer rows.Close()
if rows.Next() {
var id int64
err := rows.Scan(&id)
return id, err
}
return 0, errors.New("No serial value returned for insert: " + insertSql + " Encountered error: " + rows.Err().Error())
}
func (d OracleDialect) QuoteField(f string) string {
return `"` + strings.ToUpper(f) + `"`
}
func (d OracleDialect) QuotedTableForQuery(schema string, table string) string {
if strings.TrimSpace(schema) == "" {
return d.QuoteField(table)
}
return schema + "." + d.QuoteField(table)
}
func (d OracleDialect) IfSchemaNotExists(command, schema string) string {
return fmt.Sprintf("%s if not exists", command)
}
func (d OracleDialect) IfTableExists(command, schema, table string) string {
return fmt.Sprintf("%s if exists", command)
}
func (d OracleDialect) IfTableNotExists(command, schema, table string) string {
return fmt.Sprintf("%s if not exists", command)
}