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dataset_insert.go
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package goqu
import (
"reflect"
"sort"
)
//Generates the default INSERT statement. If Prepared has been called with true then the statement will not be interpolated. See examples.
//When using structs you may specify a column to be skipped in the insert, (e.g. id) by specifying a goqu tag with `skipinsert`
// type Item struct{
// Id uint32 `db:"id" goqu:"skipinsert"`
// Name string `db:"name"`
// }
//
//rows: variable number arguments of either map[string]interface, Record, struct, or a single slice argument of the accepted types.
//
//Errors:
// * There is no FROM clause
// * Different row types passed in, all rows must be of the same type
// * Maps with different numbers of K/V pairs
// * Rows of different lengths, (i.e. (Record{"name": "a"}, Record{"name": "a", "age": 10})
// * Error generating SQL
func (me *Dataset) ToInsertSql(rows ...interface{}) (string, []interface{}, error) {
if !me.hasSources() {
return "", nil, NewGoquError("No source found when generating insert sql")
}
switch len(rows) {
case 0:
return me.insertSql(nil, nil, me.isPrepared)
case 1:
val := reflect.ValueOf(rows[0])
if val.Kind() == reflect.Slice {
vals := make([]interface{}, val.Len())
for i := 0; i < val.Len(); i++ {
vals[i] = val.Index(i).Interface()
}
return me.ToInsertSql(vals...)
}
switch rows[0].(type) {
case *Dataset:
return me.insertFromSql(*rows[0].(*Dataset), me.isPrepared)
}
}
columns, vals, err := me.getInsertColsAndVals(rows...)
if err != nil {
return "", nil, err
}
return me.insertSql(columns, vals, me.isPrepared)
}
func (me *Dataset) canInsertField(field reflect.StructField) bool {
goquTag, dbTag := tagOptions(field.Tag.Get("goqu")), field.Tag.Get("db")
return !goquTag.Contains("skipinsert") && dbTag != "" && dbTag != "-"
}
//parses the rows gathering and sorting unique columns and values for each record
func (me *Dataset) getInsertColsAndVals(rows ...interface{}) (columns ColumnList, vals [][]interface{}, err error) {
var mapKeys valueSlice
rowValue := reflect.Indirect(reflect.ValueOf(rows[0]))
rowType := rowValue.Type()
rowKind := rowValue.Kind()
vals = make([][]interface{}, len(rows))
for i, row := range rows {
if rowType != reflect.Indirect(reflect.ValueOf(row)).Type() {
return nil, nil, NewGoquError("Rows must be all the same type expected %+v got %+v", rowType, reflect.Indirect(reflect.ValueOf(row)).Type())
}
newRowValue := reflect.Indirect(reflect.ValueOf(row))
switch rowKind {
case reflect.Map:
if columns == nil {
mapKeys = valueSlice(newRowValue.MapKeys())
sort.Sort(mapKeys)
colKeys := make([]interface{}, len(mapKeys))
for j, key := range mapKeys {
colKeys[j] = key.Interface()
}
columns = cols(colKeys...)
}
newMapKeys := valueSlice(newRowValue.MapKeys())
if len(newMapKeys) != len(mapKeys) {
return nil, nil, NewGoquError("Rows with different value length expected %d got %d", len(mapKeys), len(newMapKeys))
}
if !mapKeys.Equal(newMapKeys) {
return nil, nil, NewGoquError("Rows with different keys expected %s got %s", mapKeys.String(), newMapKeys.String())
}
rowVals := make([]interface{}, len(mapKeys))
for j, key := range mapKeys {
rowVals[j] = newRowValue.MapIndex(key).Interface()
}
vals[i] = rowVals
case reflect.Struct:
var (
rowCols []interface{}
rowVals []interface{}
)
for j := 0; j < newRowValue.NumField(); j++ {
f := newRowValue.Field(j)
t := newRowValue.Type().Field(j)
if me.canInsertField(t) {
if columns == nil {
rowCols = append(rowCols, t.Tag.Get("db"))
}
rowVals = append(rowVals, f.Interface())
}
}
if columns == nil {
columns = cols(rowCols...)
}
vals[i] = rowVals
default:
return nil, nil, NewGoquError("Unsupported insert must be map, goqu.Record, or struct type got: %T", row)
}
}
return columns, vals, nil
}
//Creates an INSERT statement with the columns and values passed in
func (me *Dataset) insertSql(cols ColumnList, values [][]interface{}, prepared bool) (string, []interface{}, error) {
buf := NewSqlBuilder(prepared)
if err := me.adapter.InsertBeginSql(buf); err != nil {
return "", nil, err
}
if err := me.adapter.SourcesSql(buf, me.clauses.From); err != nil {
return "", nil, NewGoquError(err.Error())
}
if cols == nil {
if err := me.adapter.DefaultValuesSql(buf); err != nil {
return "", nil, NewGoquError(err.Error())
}
} else {
if err := me.adapter.InsertColumnsSql(buf, cols); err != nil {
return "", nil, NewGoquError(err.Error())
}
if err := me.adapter.InsertValuesSql(buf, values); err != nil {
return "", nil, NewGoquError(err.Error())
}
}
if me.adapter.SupportsReturn() {
if err := me.adapter.ReturningSql(buf, me.clauses.Returning); err != nil {
return "", nil, err
}
} else if me.clauses.Returning != nil {
return "", nil, NewGoquError("Adapter does not support RETURNING clause")
}
sql, args := buf.ToSql()
return sql, args, nil
}
//Creates an insert statement with values coming from another dataset
func (me *Dataset) insertFromSql(other Dataset, prepared bool) (string, []interface{}, error) {
buf := NewSqlBuilder(prepared)
if err := me.adapter.InsertBeginSql(buf); err != nil {
return "", nil, err
}
if err := me.adapter.SourcesSql(buf, me.clauses.From); err != nil {
return "", nil, NewGoquError(err.Error())
}
buf.WriteString(" ")
if err := other.selectSqlWriteTo(buf); err != nil {
return "", nil, err
}
if me.adapter.SupportsReturn() {
if err := me.adapter.ReturningSql(buf, me.clauses.Returning); err != nil {
return "", nil, err
}
} else if me.clauses.Returning != nil {
return "", nil, NewGoquError("Adapter does not support RETURNING clause")
}
sql, args := buf.ToSql()
return sql, args, nil
}