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gorp.go
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gorp.go
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// Copyright 2012 James Cooper. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
// Package gorp provides a simple way to marshal Go structs to and from
// SQL databases. It uses the database/sql package, and should work with any
// compliant database/sql driver.
//
// Source code and project home:
// https://github.com/go-gorp/gorp
//
package gorp
import (
"bytes"
"database/sql"
"database/sql/driver"
"errors"
"fmt"
"reflect"
"regexp"
"strings"
"time"
)
// Oracle String (empty string is null)
type OracleString struct {
sql.NullString
}
// Scan implements the Scanner interface.
func (os *OracleString) Scan(value interface{}) error {
if value == nil {
os.String, os.Valid = "", false
return nil
}
os.Valid = true
return os.NullString.Scan(value)
}
// Value implements the driver Valuer interface.
func (os OracleString) Value() (driver.Value, error) {
if !os.Valid || os.String == "" {
return nil, nil
}
return os.String, nil
}
// A nullable Time value
type NullTime struct {
Time time.Time
Valid bool // Valid is true if Time is not NULL
}
// Scan implements the Scanner interface.
func (nt *NullTime) Scan(value interface{}) error {
switch t := value.(type) {
case time.Time:
nt.Time, nt.Valid = t, true
case []byte:
nt.Valid = false
for _, dtfmt := range []string{
"2006-01-02 15:04:05.999999999",
"2006-01-02T15:04:05.999999999",
"2006-01-02 15:04:05",
"2006-01-02T15:04:05",
"2006-01-02 15:04",
"2006-01-02T15:04",
"2006-01-02",
"2006-01-02 15:04:05-07:00",
} {
var err error
if nt.Time, err = time.Parse(dtfmt, string(t)); err == nil {
nt.Valid = true
break
}
}
}
return nil
}
// Value implements the driver Valuer interface.
func (nt NullTime) Value() (driver.Value, error) {
if !nt.Valid {
return nil, nil
}
return nt.Time, nil
}
var zeroVal reflect.Value
var versFieldConst = "[gorp_ver_field]"
// OptimisticLockError is returned by Update() or Delete() if the
// struct being modified has a Version field and the value is not equal to
// the current value in the database
type OptimisticLockError struct {
// Table name where the lock error occurred
TableName string
// Primary key values of the row being updated/deleted
Keys []interface{}
// true if a row was found with those keys, indicating the
// LocalVersion is stale. false if no value was found with those
// keys, suggesting the row has been deleted since loaded, or
// was never inserted to begin with
RowExists bool
// Version value on the struct passed to Update/Delete. This value is
// out of sync with the database.
LocalVersion int64
}
// Error returns a description of the cause of the lock error
func (e OptimisticLockError) Error() string {
if e.RowExists {
return fmt.Sprintf("gorp: OptimisticLockError table=%s keys=%v out of date version=%d", e.TableName, e.Keys, e.LocalVersion)
}
return fmt.Sprintf("gorp: OptimisticLockError no row found for table=%s keys=%v", e.TableName, e.Keys)
}
// The TypeConverter interface provides a way to map a value of one
// type to another type when persisting to, or loading from, a database.
//
// Example use cases: Implement type converter to convert bool types to "y"/"n" strings,
// or serialize a struct member as a JSON blob.
type TypeConverter interface {
// ToDb converts val to another type. Called before INSERT/UPDATE operations
ToDb(val interface{}) (interface{}, error)
// FromDb returns a CustomScanner appropriate for this type. This will be used
// to hold values returned from SELECT queries.
//
// In particular the CustomScanner returned should implement a Binder
// function appropriate for the Go type you wish to convert the db value to
//
// If bool==false, then no custom scanner will be used for this field.
FromDb(target interface{}) (CustomScanner, bool)
}
// CustomScanner binds a database column value to a Go type
type CustomScanner struct {
// After a row is scanned, Holder will contain the value from the database column.
// Initialize the CustomScanner with the concrete Go type you wish the database
// driver to scan the raw column into.
Holder interface{}
// Target typically holds a pointer to the target struct field to bind the Holder
// value to.
Target interface{}
// Binder is a custom function that converts the holder value to the target type
// and sets target accordingly. This function should return error if a problem
// occurs converting the holder to the target.
Binder func(holder interface{}, target interface{}) error
}
// Bind is called automatically by gorp after Scan()
func (me CustomScanner) Bind() error {
return me.Binder(me.Holder, me.Target)
}
// DbMap is the root gorp mapping object. Create one of these for each
// database schema you wish to map. Each DbMap contains a list of
// mapped tables.
//
// Example:
//
// dialect := gorp.MySQLDialect{"InnoDB", "UTF8"}
// dbmap := &gorp.DbMap{Db: db, Dialect: dialect}
//
type DbMap struct {
// Db handle to use with this map
Db *sql.DB
// Dialect implementation to use with this map
Dialect Dialect
TypeConverter TypeConverter
tables []*TableMap
logger GorpLogger
logPrefix string
}
// TableMap represents a mapping between a Go struct and a database table
// Use dbmap.AddTable() or dbmap.AddTableWithName() to create these
type TableMap struct {
// Name of database table.
TableName string
SchemaName string
gotype reflect.Type
Columns []*ColumnMap
keys []*ColumnMap
uniqueTogether [][]string
version *ColumnMap
insertPlan bindPlan
updatePlan bindPlan
deletePlan bindPlan
getPlan bindPlan
dbmap *DbMap
}
// ResetSql removes cached insert/update/select/delete SQL strings
// associated with this TableMap. Call this if you've modified
// any column names or the table name itself.
func (t *TableMap) ResetSql() {
t.insertPlan = bindPlan{}
t.updatePlan = bindPlan{}
t.deletePlan = bindPlan{}
t.getPlan = bindPlan{}
}
// SetKeys lets you specify the fields on a struct that map to primary
// key columns on the table. If isAutoIncr is set, result.LastInsertId()
// will be used after INSERT to bind the generated id to the Go struct.
//
// Automatically calls ResetSql() to ensure SQL statements are regenerated.
//
// Panics if isAutoIncr is true, and fieldNames length != 1
//
func (t *TableMap) SetKeys(isAutoIncr bool, fieldNames ...string) *TableMap {
if isAutoIncr && len(fieldNames) != 1 {
panic(fmt.Sprintf(
"gorp: SetKeys: fieldNames length must be 1 if key is auto-increment. (Saw %v fieldNames)",
len(fieldNames)))
}
t.keys = make([]*ColumnMap, 0)
for _, name := range fieldNames {
colmap := t.ColMap(name)
colmap.isPK = true
colmap.isAutoIncr = isAutoIncr
t.keys = append(t.keys, colmap)
}
t.ResetSql()
return t
}
// SetUniqueTogether lets you specify uniqueness constraints across multiple
// columns on the table. Each call adds an additional constraint for the
// specified columns.
//
// Automatically calls ResetSql() to ensure SQL statements are regenerated.
//
// Panics if fieldNames length < 2.
//
func (t *TableMap) SetUniqueTogether(fieldNames ...string) *TableMap {
if len(fieldNames) < 2 {
panic(fmt.Sprintf(
"gorp: SetUniqueTogether: must provide at least two fieldNames to set uniqueness constraint."))
}
columns := make([]string, 0)
for _, name := range fieldNames {
columns = append(columns, name)
}
t.uniqueTogether = append(t.uniqueTogether, columns)
t.ResetSql()
return t
}
// ColMap returns the ColumnMap pointer matching the given struct field
// name. It panics if the struct does not contain a field matching this
// name.
func (t *TableMap) ColMap(field string) *ColumnMap {
col := colMapOrNil(t, field)
if col == nil {
e := fmt.Sprintf("No ColumnMap in table %s type %s with field %s",
t.TableName, t.gotype.Name(), field)
panic(e)
}
return col
}
func colMapOrNil(t *TableMap, field string) *ColumnMap {
for _, col := range t.Columns {
if col.fieldName == field || col.ColumnName == field {
return col
}
}
return nil
}
// SetVersionCol sets the column to use as the Version field. By default
// the "Version" field is used. Returns the column found, or panics
// if the struct does not contain a field matching this name.
//
// Automatically calls ResetSql() to ensure SQL statements are regenerated.
func (t *TableMap) SetVersionCol(field string) *ColumnMap {
c := t.ColMap(field)
t.version = c
t.ResetSql()
return c
}
type bindPlan struct {
query string
argFields []string
keyFields []string
versField string
autoIncrIdx int
autoIncrFieldName string
}
func (plan bindPlan) createBindInstance(elem reflect.Value, conv TypeConverter) (bindInstance, error) {
bi := bindInstance{query: plan.query, autoIncrIdx: plan.autoIncrIdx, autoIncrFieldName: plan.autoIncrFieldName, versField: plan.versField}
if plan.versField != "" {
bi.existingVersion = elem.FieldByName(plan.versField).Int()
}
var err error
for i := 0; i < len(plan.argFields); i++ {
k := plan.argFields[i]
if k == versFieldConst {
newVer := bi.existingVersion + 1
bi.args = append(bi.args, newVer)
if bi.existingVersion == 0 {
elem.FieldByName(plan.versField).SetInt(int64(newVer))
}
} else {
val := elem.FieldByName(k).Interface()
if conv != nil {
val, err = conv.ToDb(val)
if err != nil {
return bindInstance{}, err
}
}
bi.args = append(bi.args, val)
}
}
for i := 0; i < len(plan.keyFields); i++ {
k := plan.keyFields[i]
val := elem.FieldByName(k).Interface()
if conv != nil {
val, err = conv.ToDb(val)
if err != nil {
return bindInstance{}, err
}
}
bi.keys = append(bi.keys, val)
}
return bi, nil
}
type bindInstance struct {
query string
args []interface{}
keys []interface{}
existingVersion int64
versField string
autoIncrIdx int
autoIncrFieldName string
}
func (t *TableMap) bindInsert(elem reflect.Value) (bindInstance, error) {
plan := t.insertPlan
if plan.query == "" {
plan.autoIncrIdx = -1
s := bytes.Buffer{}
s2 := bytes.Buffer{}
s.WriteString(fmt.Sprintf("insert into %s (", t.dbmap.Dialect.QuotedTableForQuery(t.SchemaName, t.TableName)))
x := 0
first := true
for y := range t.Columns {
col := t.Columns[y]
if !(col.isAutoIncr && t.dbmap.Dialect.AutoIncrBindValue() == "") {
if !col.Transient {
if !first {
s.WriteString(",")
s2.WriteString(",")
}
s.WriteString(t.dbmap.Dialect.QuoteField(col.ColumnName))
if col.isAutoIncr {
s2.WriteString(t.dbmap.Dialect.AutoIncrBindValue())
plan.autoIncrIdx = y
plan.autoIncrFieldName = col.fieldName
} else {
s2.WriteString(t.dbmap.Dialect.BindVar(x))
if col == t.version {
plan.versField = col.fieldName
plan.argFields = append(plan.argFields, versFieldConst)
} else {
plan.argFields = append(plan.argFields, col.fieldName)
}
x++
}
first = false
}
} else {
plan.autoIncrIdx = y
plan.autoIncrFieldName = col.fieldName
}
}
s.WriteString(") values (")
s.WriteString(s2.String())
s.WriteString(")")
if plan.autoIncrIdx > -1 {
s.WriteString(t.dbmap.Dialect.AutoIncrInsertSuffix(t.Columns[plan.autoIncrIdx]))
}
s.WriteString(t.dbmap.Dialect.QuerySuffix())
plan.query = s.String()
t.insertPlan = plan
}
return plan.createBindInstance(elem, t.dbmap.TypeConverter)
}
func (t *TableMap) bindUpdate(elem reflect.Value) (bindInstance, error) {
plan := t.updatePlan
if plan.query == "" {
s := bytes.Buffer{}
s.WriteString(fmt.Sprintf("update %s set ", t.dbmap.Dialect.QuotedTableForQuery(t.SchemaName, t.TableName)))
x := 0
for y := range t.Columns {
col := t.Columns[y]
if !col.isAutoIncr && !col.Transient {
if x > 0 {
s.WriteString(", ")
}
s.WriteString(t.dbmap.Dialect.QuoteField(col.ColumnName))
s.WriteString("=")
s.WriteString(t.dbmap.Dialect.BindVar(x))
if col == t.version {
plan.versField = col.fieldName
plan.argFields = append(plan.argFields, versFieldConst)
} else {
plan.argFields = append(plan.argFields, col.fieldName)
}
x++
}
}
s.WriteString(" where ")
for y := range t.keys {
col := t.keys[y]
if y > 0 {
s.WriteString(" and ")
}
s.WriteString(t.dbmap.Dialect.QuoteField(col.ColumnName))
s.WriteString("=")
s.WriteString(t.dbmap.Dialect.BindVar(x))
plan.argFields = append(plan.argFields, col.fieldName)
plan.keyFields = append(plan.keyFields, col.fieldName)
x++
}
if plan.versField != "" {
s.WriteString(" and ")
s.WriteString(t.dbmap.Dialect.QuoteField(t.version.ColumnName))
s.WriteString("=")
s.WriteString(t.dbmap.Dialect.BindVar(x))
plan.argFields = append(plan.argFields, plan.versField)
}
s.WriteString(t.dbmap.Dialect.QuerySuffix())
plan.query = s.String()
t.updatePlan = plan
}
return plan.createBindInstance(elem, t.dbmap.TypeConverter)
}
func (t *TableMap) bindDelete(elem reflect.Value) (bindInstance, error) {
plan := t.deletePlan
if plan.query == "" {
s := bytes.Buffer{}
s.WriteString(fmt.Sprintf("delete from %s", t.dbmap.Dialect.QuotedTableForQuery(t.SchemaName, t.TableName)))
for y := range t.Columns {
col := t.Columns[y]
if !col.Transient {
if col == t.version {
plan.versField = col.fieldName
}
}
}
s.WriteString(" where ")
for x := range t.keys {
k := t.keys[x]
if x > 0 {
s.WriteString(" and ")
}
s.WriteString(t.dbmap.Dialect.QuoteField(k.ColumnName))
s.WriteString("=")
s.WriteString(t.dbmap.Dialect.BindVar(x))
plan.keyFields = append(plan.keyFields, k.fieldName)
plan.argFields = append(plan.argFields, k.fieldName)
}
if plan.versField != "" {
s.WriteString(" and ")
s.WriteString(t.dbmap.Dialect.QuoteField(t.version.ColumnName))
s.WriteString("=")
s.WriteString(t.dbmap.Dialect.BindVar(len(plan.argFields)))
plan.argFields = append(plan.argFields, plan.versField)
}
s.WriteString(t.dbmap.Dialect.QuerySuffix())
plan.query = s.String()
t.deletePlan = plan
}
return plan.createBindInstance(elem, t.dbmap.TypeConverter)
}
func (t *TableMap) bindGet() bindPlan {
plan := t.getPlan
if plan.query == "" {
s := bytes.Buffer{}
s.WriteString("select ")
x := 0
for _, col := range t.Columns {
if !col.Transient {
if x > 0 {
s.WriteString(",")
}
s.WriteString(t.dbmap.Dialect.QuoteField(col.ColumnName))
plan.argFields = append(plan.argFields, col.fieldName)
x++
}
}
s.WriteString(" from ")
s.WriteString(t.dbmap.Dialect.QuotedTableForQuery(t.SchemaName, t.TableName))
s.WriteString(" where ")
for x := range t.keys {
col := t.keys[x]
if x > 0 {
s.WriteString(" and ")
}
s.WriteString(t.dbmap.Dialect.QuoteField(col.ColumnName))
s.WriteString("=")
s.WriteString(t.dbmap.Dialect.BindVar(x))
plan.keyFields = append(plan.keyFields, col.fieldName)
}
s.WriteString(t.dbmap.Dialect.QuerySuffix())
plan.query = s.String()
t.getPlan = plan
}
return plan
}
// ColumnMap represents a mapping between a Go struct field and a single
// column in a table.
// Unique and MaxSize only inform the
// CreateTables() function and are not used by Insert/Update/Delete/Get.
type ColumnMap struct {
// Column name in db table
ColumnName string
// If true, this column is skipped in generated SQL statements
Transient bool
// If true, " unique" is added to create table statements.
// Not used elsewhere
Unique bool
// Passed to Dialect.ToSqlType() to assist in informing the
// correct column type to map to in CreateTables()
// Not used elsewhere
MaxSize int
fieldName string
gotype reflect.Type
isPK bool
isAutoIncr bool
isNotNull bool
}
// Rename allows you to specify the column name in the table
//
// Example: table.ColMap("Updated").Rename("date_updated")
//
func (c *ColumnMap) Rename(colname string) *ColumnMap {
c.ColumnName = colname
return c
}
// SetTransient allows you to mark the column as transient. If true
// this column will be skipped when SQL statements are generated
func (c *ColumnMap) SetTransient(b bool) *ColumnMap {
c.Transient = b
return c
}
// SetUnique adds "unique" to the create table statements for this
// column, if b is true.
func (c *ColumnMap) SetUnique(b bool) *ColumnMap {
c.Unique = b
return c
}
// SetNotNull adds "not null" to the create table statements for this
// column, if nn is true.
func (c *ColumnMap) SetNotNull(nn bool) *ColumnMap {
c.isNotNull = nn
return c
}
// SetMaxSize specifies the max length of values of this column. This is
// passed to the dialect.ToSqlType() function, which can use the value
// to alter the generated type for "create table" statements
func (c *ColumnMap) SetMaxSize(size int) *ColumnMap {
c.MaxSize = size
return c
}
// Transaction represents a database transaction.
// Insert/Update/Delete/Get/Exec operations will be run in the context
// of that transaction. Transactions should be terminated with
// a call to Commit() or Rollback()
type Transaction struct {
dbmap *DbMap
tx *sql.Tx
closed bool
}
// Executor exposes the sql.DB and sql.Tx Exec function so that it can be used
// on internal functions that convert named parameters for the Exec function.
type executor interface {
Exec(query string, args ...interface{}) (sql.Result, error)
}
// SqlExecutor exposes gorp operations that can be run from Pre/Post
// hooks. This hides whether the current operation that triggered the
// hook is in a transaction.
//
// See the DbMap function docs for each of the functions below for more
// information.
type SqlExecutor interface {
Get(i interface{}, keys ...interface{}) (interface{}, error)
Insert(list ...interface{}) error
Update(list ...interface{}) (int64, error)
Delete(list ...interface{}) (int64, error)
Exec(query string, args ...interface{}) (sql.Result, error)
Select(i interface{}, query string,
args ...interface{}) ([]interface{}, error)
SelectInt(query string, args ...interface{}) (int64, error)
SelectNullInt(query string, args ...interface{}) (sql.NullInt64, error)
SelectFloat(query string, args ...interface{}) (float64, error)
SelectNullFloat(query string, args ...interface{}) (sql.NullFloat64, error)
SelectStr(query string, args ...interface{}) (string, error)
SelectNullStr(query string, args ...interface{}) (sql.NullString, error)
SelectOne(holder interface{}, query string, args ...interface{}) error
query(query string, args ...interface{}) (*sql.Rows, error)
queryRow(query string, args ...interface{}) *sql.Row
}
// Compile-time check that DbMap and Transaction implement the SqlExecutor
// interface.
var _, _ SqlExecutor = &DbMap{}, &Transaction{}
type GorpLogger interface {
Printf(format string, v ...interface{})
}
// TraceOn turns on SQL statement logging for this DbMap. After this is
// called, all SQL statements will be sent to the logger. If prefix is
// a non-empty string, it will be written to the front of all logged
// strings, which can aid in filtering log lines.
//
// Use TraceOn if you want to spy on the SQL statements that gorp
// generates.
//
// Note that the base log.Logger type satisfies GorpLogger, but adapters can
// easily be written for other logging packages (e.g., the golang-sanctioned
// glog framework).
func (m *DbMap) TraceOn(prefix string, logger GorpLogger) {
m.logger = logger
if prefix == "" {
m.logPrefix = prefix
} else {
m.logPrefix = fmt.Sprintf("%s ", prefix)
}
}
// TraceOff turns off tracing. It is idempotent.
func (m *DbMap) TraceOff() {
m.logger = nil
m.logPrefix = ""
}
// AddTable registers the given interface type with gorp. The table name
// will be given the name of the TypeOf(i). You must call this function,
// or AddTableWithName, for any struct type you wish to persist with
// the given DbMap.
//
// This operation is idempotent. If i's type is already mapped, the
// existing *TableMap is returned
func (m *DbMap) AddTable(i interface{}) *TableMap {
return m.AddTableWithName(i, "")
}
// AddTableWithName has the same behavior as AddTable, but sets
// table.TableName to name.
func (m *DbMap) AddTableWithName(i interface{}, name string) *TableMap {
return m.AddTableWithNameAndSchema(i, "", name)
}
// AddTableWithNameAndSchema has the same behavior as AddTable, but sets
// table.TableName to name.
func (m *DbMap) AddTableWithNameAndSchema(i interface{}, schema string, name string) *TableMap {
t := reflect.TypeOf(i)
if name == "" {
name = t.Name()
}
// check if we have a table for this type already
// if so, update the name and return the existing pointer
for i := range m.tables {
table := m.tables[i]
if table.gotype == t {
table.TableName = name
return table
}
}
tmap := &TableMap{gotype: t, TableName: name, SchemaName: schema, dbmap: m}
tmap.Columns = m.readStructColumns(t)
m.tables = append(m.tables, tmap)
return tmap
}
func (m *DbMap) readStructColumns(t reflect.Type) (cols []*ColumnMap) {
n := t.NumField()
for i := 0; i < n; i++ {
f := t.Field(i)
if f.Anonymous && f.Type.Kind() == reflect.Struct {
// Recursively add nested fields in embedded structs.
subcols := m.readStructColumns(f.Type)
// Don't append nested fields that have the same field
// name as an already-mapped field.
for _, subcol := range subcols {
shouldAppend := true
for _, col := range cols {
if !subcol.Transient && subcol.fieldName == col.fieldName {
shouldAppend = false
break
}
}
if shouldAppend {
cols = append(cols, subcol)
}
}
} else {
columnName := f.Tag.Get("db")
if columnName == "" {
columnName = f.Name
}
gotype := f.Type
if m.TypeConverter != nil {
// Make a new pointer to a value of type gotype and
// pass it to the TypeConverter's FromDb method to see
// if a different type should be used for the column
// type during table creation.
value := reflect.New(gotype).Interface()
scanner, useHolder := m.TypeConverter.FromDb(value)
if useHolder {
gotype = reflect.TypeOf(scanner.Holder)
}
}
cm := &ColumnMap{
ColumnName: columnName,
Transient: columnName == "-",
fieldName: f.Name,
gotype: gotype,
}
// Check for nested fields of the same field name and
// override them.
shouldAppend := true
for index, col := range cols {
if !col.Transient && col.fieldName == cm.fieldName {
cols[index] = cm
shouldAppend = false
break
}
}
if shouldAppend {
cols = append(cols, cm)
}
}
}
return
}
// CreateTables iterates through TableMaps registered to this DbMap and
// executes "create table" statements against the database for each.
//
// This is particularly useful in unit tests where you want to create
// and destroy the schema automatically.
func (m *DbMap) CreateTables() error {
return m.createTables(false)
}
// CreateTablesIfNotExists is similar to CreateTables, but starts
// each statement with "create table if not exists" so that existing
// tables do not raise errors
func (m *DbMap) CreateTablesIfNotExists() error {
return m.createTables(true)
}
func (m *DbMap) createTables(ifNotExists bool) error {
var err error
for i := range m.tables {
table := m.tables[i]
s := bytes.Buffer{}
if strings.TrimSpace(table.SchemaName) != "" {
schemaCreate := "create schema"
if ifNotExists {
s.WriteString(m.Dialect.IfSchemaNotExists(schemaCreate, table.SchemaName))
} else {
s.WriteString(schemaCreate)
}
s.WriteString(fmt.Sprintf(" %s;", table.SchemaName))
}
tableCreate := "create table"
if ifNotExists {
s.WriteString(m.Dialect.IfTableNotExists(tableCreate, table.SchemaName, table.TableName))
} else {
s.WriteString(tableCreate)
}
s.WriteString(fmt.Sprintf(" %s (", m.Dialect.QuotedTableForQuery(table.SchemaName, table.TableName)))
x := 0
for _, col := range table.Columns {
if !col.Transient {
if x > 0 {
s.WriteString(", ")
}
stype := m.Dialect.ToSqlType(col.gotype, col.MaxSize, col.isAutoIncr)
s.WriteString(fmt.Sprintf("%s %s", m.Dialect.QuoteField(col.ColumnName), stype))
if col.isPK || col.isNotNull {
s.WriteString(" not null")
}
if col.isPK && len(table.keys) == 1 {
s.WriteString(" primary key")
}
if col.Unique {
s.WriteString(" unique")
}
if col.isAutoIncr {
s.WriteString(fmt.Sprintf(" %s", m.Dialect.AutoIncrStr()))
}
x++
}
}
if len(table.keys) > 1 {
s.WriteString(", primary key (")
for x := range table.keys {
if x > 0 {
s.WriteString(", ")
}
s.WriteString(m.Dialect.QuoteField(table.keys[x].ColumnName))
}
s.WriteString(")")
}
if len(table.uniqueTogether) > 0 {
for _, columns := range table.uniqueTogether {
s.WriteString(", unique (")
for i, column := range columns {
if i > 0 {
s.WriteString(", ")
}
s.WriteString(m.Dialect.QuoteField(column))
}
s.WriteString(")")
}
}
s.WriteString(") ")
s.WriteString(m.Dialect.CreateTableSuffix())
s.WriteString(m.Dialect.QuerySuffix())
_, err = m.Exec(s.String())
if err != nil {
break
}
}
return err
}
// DropTable drops an individual table. Will throw an error
// if the table does not exist.
func (m *DbMap) DropTable(table interface{}) error {
t := reflect.TypeOf(table)
return m.dropTable(t, false)
}
// DropTable drops an individual table. Will NOT throw an error
// if the table does not exist.
func (m *DbMap) DropTableIfExists(table interface{}) error {
t := reflect.TypeOf(table)
return m.dropTable(t, true)
}
// DropTables iterates through TableMaps registered to this DbMap and
// executes "drop table" statements against the database for each.
func (m *DbMap) DropTables() error {
return m.dropTables(false)
}
// DropTablesIfExists is the same as DropTables, but uses the "if exists" clause to
// avoid errors for tables that do not exist.
func (m *DbMap) DropTablesIfExists() error {
return m.dropTables(true)
}
// Goes through all the registered tables, dropping them one by one.
// If an error is encountered, then it is returned and the rest of
// the tables are not dropped.
func (m *DbMap) dropTables(addIfExists bool) (err error) {
for _, table := range m.tables {
err = m.dropTableImpl(table, addIfExists)
if err != nil {
return
}
}
return err
}
// Implementation of dropping a single table.
func (m *DbMap) dropTable(t reflect.Type, addIfExists bool) error {
table := tableOrNil(m, t)
if table == nil {
return errors.New(fmt.Sprintf("table %s was not registered!", table.TableName))
}
return m.dropTableImpl(table, addIfExists)
}
func (m *DbMap) dropTableImpl(table *TableMap, ifExists bool) (err error) {
tableDrop := "drop table"
if ifExists {
tableDrop = m.Dialect.IfTableExists(tableDrop, table.SchemaName, table.TableName)
}
_, err = m.Exec(fmt.Sprintf("%s %s;", tableDrop, m.Dialect.QuotedTableForQuery(table.SchemaName, table.TableName)))
return err
}
// TruncateTables iterates through TableMaps registered to this DbMap and
// executes "truncate table" statements against the database for each, or in the case of
// sqlite, a "delete from" with no "where" clause, which uses the truncate optimization
// (http://www.sqlite.org/lang_delete.html)
func (m *DbMap) TruncateTables() error {
var err error
for i := range m.tables {
table := m.tables[i]
_, e := m.Exec(fmt.Sprintf("%s %s;", m.Dialect.TruncateClause(), m.Dialect.QuotedTableForQuery(table.SchemaName, table.TableName)))
if e != nil {
err = e
}
}
return err
}
// Insert runs a SQL INSERT statement for each element in list. List
// items must be pointers.
//
// Any interface whose TableMap has an auto-increment primary key will
// have its last insert id bound to the PK field on the struct.
//
// The hook functions PreInsert() and/or PostInsert() will be executed
// before/after the INSERT statement if the interface defines them.
//
// Panics if any interface in the list has not been registered with AddTable
func (m *DbMap) Insert(list ...interface{}) error {
return insert(m, m, list...)
}
// Update runs a SQL UPDATE statement for each element in list. List
// items must be pointers.
//
// The hook functions PreUpdate() and/or PostUpdate() will be executed
// before/after the UPDATE statement if the interface defines them.
//
// Returns the number of rows updated.