v8.0.1

HISTORY.md

@@ -1,3 +1,8 @@
+## v8.0.1
+
+* [ADDED] Multi table update support for `mysql` and `postgres` [#60](https://github.com/doug-martin/goqu/issues/60)
+* [ADDED] `goqu.V` so values can be used on the LHS of expressions [#104](https://github.com/doug-martin/goqu/issues/104)
+
 ## v8.0.0
 
 A major change the the API was made in `v8` to seperate concerns between the different SQL statement types. 

dialect/mysql/mysql.go

@@ -19,6 +19,8 @@ func DialectOptions() *goqu.SQLDialectOptions {
 	opts.SupportsWithCTE = false
 	opts.SupportsWithCTERecursive = false
 
+	opts.UseFromClauseForMultipleUpdateTables = false
+
 	opts.PlaceHolderRune = '?'
 	opts.IncludePlaceholderNum = false
 	opts.QuoteRune = '`'

dialect/mysql/mysql_dialect_test.go

@@ -172,7 +172,17 @@ func (mds *mysqlDialectSuite) TestBooleanOperations() {
 	sql, _, err = ds.Where(col.NotILike(regexp.MustCompile("(a|b)"))).ToSQL()
 	assert.NoError(t, err)
 	assert.Equal(t, sql, "SELECT * FROM `test` WHERE (`a` NOT REGEXP '(a|b)')")
+}
 
+func (mds *mysqlDialectSuite) TestUpdateSQL() {
+	ds := mds.GetDs("test").Update()
+	sql, _, err := ds.
+		Set(goqu.Record{"foo": "bar"}).
+		From("test_2").
+		Where(goqu.I("test.id").Eq(goqu.I("test_2.test_id"))).
+		ToSQL()
+	mds.NoError(err)
+	mds.Equal("UPDATE `test`,`test_2` SET `foo`='bar' WHERE (`test`.`id` = `test_2`.`test_id`)", sql)
 }
 
 func TestDatasetAdapterSuite(t *testing.T) {

dialect/mysql/mysql_test.go

@@ -199,6 +199,24 @@ func (mt *mysqlTest) TestQuery() {
 	assert.Len(t, entries, 0)
 }
 
+func (mt *mysqlTest) TestQuery_ValueExpressions() {
+	type wrappedEntry struct {
+		entry
+		BoolValue bool `db:"bool_value"`
+	}
+	expectedDate, err := time.Parse("2006-01-02 15:04:05", "2015-02-22 19:19:55")
+	mt.NoError(err)
+	ds := mt.db.From("entry").Select(goqu.Star(), goqu.V(true).As("bool_value")).Where(goqu.Ex{"int": 1})
+	var we wrappedEntry
+	found, err := ds.ScanStruct(&we)
+	mt.NoError(err)
+	mt.True(found)
+	mt.Equal(we, wrappedEntry{
+		entry{2, 1, 0.100000, "0.100000", expectedDate, false, []byte("0.100000")},
+		true,
+	})
+}
+
 func (mt *mysqlTest) TestCount() {
 	t := mt.T()
 	ds := mt.db.From("entry")

dialect/postgres/postgres_test.go

@@ -193,6 +193,27 @@ func (pt *postgresTest) TestQuery() {
 	assert.Len(t, entries, 0)
 }
 
+func (pt *postgresTest) TestQuery_ValueExpressions() {
+	type wrappedEntry struct {
+		entry
+		BoolValue bool `db:"bool_value"`
+	}
+	expectedDate, err := time.Parse(time.RFC3339Nano, "2015-02-22T19:19:55.000000000-00:00")
+	pt.NoError(err)
+	ds := pt.db.From("entry").Select(goqu.Star(), goqu.V(true).As("bool_value")).Where(goqu.Ex{"int": 1})
+	var we wrappedEntry
+	found, err := ds.ScanStruct(&we)
+	pt.NoError(err)
+	pt.True(found)
+	pt.Equal(1, we.Int)
+	pt.Equal(0.100000, we.Float)
+	pt.Equal("0.100000", we.String)
+	pt.Equal(expectedDate.Unix(), we.Time.Unix())
+	pt.Equal(false, we.Bool)
+	pt.Equal([]byte("0.100000"), we.Bytes)
+	pt.True(we.BoolValue)
+}
+
 func (pt *postgresTest) TestCount() {
 	t := pt.T()
 	ds := pt.db.From("entry")
@@ -311,6 +332,17 @@ func (pt *postgresTest) TestUpdate() {
 	assert.Equal(t, id, e.ID)
 }
 
+func (pt *postgresTest) TestUpdateSQL_multipleTables() {
+	ds := pt.db.Update("test")
+	updateSQL, _, err := ds.
+		Set(goqu.Record{"foo": "bar"}).
+		From("test_2").
+		Where(goqu.I("test.id").Eq(goqu.I("test_2.test_id"))).
+		ToSQL()
+	pt.NoError(err)
+	pt.Equal(`UPDATE "test" SET "foo"='bar' FROM "test_2" WHERE ("test"."id" = "test_2"."test_id")`, updateSQL)
+}
+
 func (pt *postgresTest) TestDelete() {
 	t := pt.T()
 	ds := pt.db.From("entry")

dialect/sqlite3/sqlite3.go

@@ -16,6 +16,7 @@ func DialectOptions() *goqu.SQLDialectOptions {
 	opts.SupportsConflictUpdateWhere = false
 	opts.SupportsInsertIgnoreSyntax = true
 	opts.SupportsConflictTarget = false
+	opts.SupportsMultipleUpdateTables = false
 	opts.WrapCompoundsInParens = false
 
 	opts.PlaceHolderRune = '?'

dialect/sqlite3/sqlite3_dialect_test.go

@@ -31,6 +31,16 @@ func (sds *sqlite3DialectSuite) TestIdentifiers() {
 	assert.Equal(t, sql, "SELECT `a`, `a`.`b`.`c`, `c`.`d`, `test` AS `test` FROM `test`")
 }
 
+func (sds *sqlite3DialectSuite) TestUpdateSQL_multipleTables() {
+	ds := sds.GetDs("test").Update()
+	_, _, err := ds.
+		Set(goqu.Record{"foo": "bar"}).
+		From("test_2").
+		Where(goqu.I("test.id").Eq(goqu.I("test_2.test_id"))).
+		ToSQL()
+	sds.EqualError(err, "goqu: sqlite3 dialect does not support multiple tables in UPDATE")
+}
+
 func (sds *sqlite3DialectSuite) TestCompoundExpressions() {
 	t := sds.T()
 	ds1 := sds.GetDs("test").Select("a")

dialect/sqlite3/sqlite3_test.go

@@ -212,6 +212,24 @@ func (st *sqlite3Suite) TestQuery() {
 	assert.Len(t, entries, 0)
 }
 
+func (st *sqlite3Suite) TestQuery_ValueExpressions() {
+	type wrappedEntry struct {
+		entry
+		BoolValue bool `db:"bool_value"`
+	}
+	expectedDate, err := time.Parse("2006-01-02 15:04:05", "2015-02-22 19:19:55")
+	st.NoError(err)
+	ds := st.db.From("entry").Select(goqu.Star(), goqu.V(true).As("bool_value")).Where(goqu.Ex{"int": 1})
+	var we wrappedEntry
+	found, err := ds.ScanStruct(&we)
+	st.NoError(err)
+	st.True(found)
+	st.Equal(we, wrappedEntry{
+		entry{2, 1, 0.100000, "0.100000", expectedDate, false, []byte("0.100000")},
+		true,
+	})
+}
+
 func (st *sqlite3Suite) TestCount() {
 	t := st.T()
 	ds := st.db.From("entry")

docs/expressions.md

@@ -8,7 +8,8 @@
 * [`T`](#T) - An Identifier that represents a Table. With a Table identifier you can fully qualify columns.
 * [`C`](#C) - An Identifier that represents a Column. See the docs for more examples
 * [`I`](#I) - An Identifier represents a schema, table, or column or any combination. I parses identifiers seperated by a . character.
-* [`L`](#L) - An SQL literal. 
+* [`L`](#L) - An SQL literal.
+* [`V`](#V) - An Value to be used in SQL. 
 * [`And`](#and) - AND multiple expressions together.
 * [`Or`](#or) - OR multiple expressions together.
 * [Complex Example] - Complex Example using most of the Expression DSL.
@@ -201,6 +202,61 @@ SELECT * FROM "test" WHERE ("json"::TEXT = "other_json"::TEXT) AND col IN ('a',
 SELECT * FROM "test" WHERE ("json"::TEXT = "other_json"::TEXT) AND col IN ($1, $2, $3) [a, b, c]
 ```
 
+<a name="V"></a>
+**[`V()`](https://godoc.org/github.com/doug-martin/goqu#V)**
+
+Sometimes you may have a value that you want to use directly in SQL. 
+
+**NOTE** This is a shorter version of `goqu.L("?", val)`
+
+For example you may want to select a value as a column.
+
+```go
+ds := goqu.From("user").Select(
+	goqu.V(true).As("is_verified"),
+	goqu.V(1.2).As("version"),
+	"first_name",
+	"last_name",
+)
+
+sql, args, _ := ds.ToSQL()
+fmt.Println(sql, args)
+```
+
+Output:
+```
+SELECT TRUE AS "is_verified", 1.2 AS "version", "first_name", "last_name" FROM "user" []
+```
+
+You can also use `goqu.V` in where clauses.
+
+```
+ds := goqu.From("user").Where(goqu.V(1).Neq(1))
+sql, args, _ := ds.ToSQL()
+fmt.Println(sql, args)
+```
+
+Output:
+
+```
+SELECT * FROM "user" WHERE (1 != 1) []
+```
+
+You can also use them in prepared statements.
+
+```
+ds := goqu.From("user").Where(goqu.V(1).Neq(1))
+sql, args, _ := ds.Prepared(true).ToSQL()
+fmt.Println(sql, args)
+```
+
+Output:
+
+```
+SELECT * FROM "user" WHERE (? != ?) [1, 1]
+```
+
+
 <a name="and"></a>
 **[`And()`](https://godoc.org/github.com/doug-martin/goqu#And)** 
 
@@ -388,3 +444,4 @@ HAVING (AVG("test3"."age") > ?)
 ORDER BY "test"."created" DESC NULLS LAST [^(a|b) passed active registered 10]
 ```
 
+

docs/updating.md

@@ -5,6 +5,7 @@
   * [Set with `goqu.Record`](#set-record)
   * [Set with struct](#set-struct)
   * [Set with map](#set-map)
+  * [Multi Table](#from)
   * [Where](#where)
   * [Order](#order)
   * [Limit](#limit)
@@ -167,6 +168,50 @@ Output:
 UPDATE "items" SET "address"='111 Test Addr',"name"='Test' []
 ```
 
+<a name="from"></a>
+**[From / Multi Table](https://godoc.org/github.com/doug-martin/goqu/#UpdateDataset.From)**
+
+`goqu` allows joining multiple tables in a update clause through `From`.
+
+**NOTE** The `sqlite3` adapter does not support a multi table syntax.
+
+`Postgres` Example 
+
+```go
+dialect := goqu.Dialect("postgres")
+
+ds := dialect.Update("table_one").
+    Set(goqu.Record{"foo": goqu.I("table_two.bar")}).
+    From("table_two").
+    Where(goqu.Ex{"table_one.id": goqu.I("table_two.id")})
+
+sql, _, _ := ds.ToSQL()
+fmt.Println(sql)
+```
+
+Output:
+```sql
+UPDATE "table_one" SET "foo"="table_two"."bar" FROM "table_two" WHERE ("table_one"."id" = "table_two"."id")
+```
+
+`MySQL` Example
+
+```go
+dialect := goqu.Dialect("mysql")
+
+ds := dialect.Update("table_one").
+    Set(goqu.Record{"foo": goqu.I("table_two.bar")}).
+    From("table_two").
+    Where(goqu.Ex{"table_one.id": goqu.I("table_two.id")})
+
+sql, _, _ := ds.ToSQL()
+fmt.Println(sql)
+```
+Output:
+```sql
+UPDATE `table_one`,`table_two` SET `foo`=`table_two`.`bar` WHERE (`table_one`.`id` = `table_two`.`id`)
+```
+
 <a name="where"></a>
 **[Where](https://godoc.org/github.com/doug-martin/goqu/#UpdateDataset.Where)**
 

exp/update_clauses.go

@@ -12,8 +12,13 @@ type (
 		SetTable(table Expression) UpdateClauses
 
 		SetValues() interface{}
+		HasSetValues() bool
 		SetSetValues(values interface{}) UpdateClauses
 
+		From() ColumnListExpression
+		HasFrom() bool
+		SetFrom(tables ColumnListExpression) UpdateClauses
+
 		Where() ExpressionList
 		ClearWhere() UpdateClauses
 		WhereAppend(expressions ...Expression) UpdateClauses
@@ -38,6 +43,7 @@ type (
 		commonTables []CommonTableExpression
 		table        Expression
 		setValues    interface{}
+		from         ColumnListExpression
 		where        ExpressionList
 		order        ColumnListExpression
 		limit        interface{}
@@ -58,6 +64,7 @@ func (uc *updateClauses) clone() *updateClauses {
 		commonTables: uc.commonTables,
 		table:        uc.table,
 		setValues:    uc.setValues,
+		from:         uc.from,
 		where:        uc.where,
 		order:        uc.order,
 		limit:        uc.limit,
@@ -86,12 +93,31 @@ func (uc *updateClauses) SetTable(table Expression) UpdateClauses {
 func (uc *updateClauses) SetValues() interface{} {
 	return uc.setValues
 }
+
+func (uc *updateClauses) HasSetValues() bool {
+	return uc.setValues != nil
+}
+
 func (uc *updateClauses) SetSetValues(values interface{}) UpdateClauses {
 	ret := uc.clone()
 	ret.setValues = values
 	return ret
 }
 
+func (uc *updateClauses) From() ColumnListExpression {
+	return uc.from
+}
+
+func (uc *updateClauses) HasFrom() bool {
+	return uc.from != nil && !uc.from.IsEmpty()
+}
+
+func (uc *updateClauses) SetFrom(from ColumnListExpression) UpdateClauses {
+	ret := uc.clone()
+	ret.from = from
+	return ret
+}
+
 func (uc *updateClauses) Where() ExpressionList {
 	return uc.where
 }

exp/update_clauses_test.go

@@ -70,6 +70,29 @@ func (ucs *updateClausesSuite) TestSetSetValues() {
 	assert.Equal(t, r2, c2.SetValues())
 }
 
+func (ucs *updateClausesSuite) TestFrom() {
+	t := ucs.T()
+	c := NewUpdateClauses()
+	ce := NewColumnListExpression("a", "b")
+	c2 := c.SetFrom(ce)
+
+	assert.Nil(t, c.From())
+
+	assert.Equal(t, ce, c2.From())
+}
+
+func (ucs *updateClausesSuite) TestSetFrom() {
+	t := ucs.T()
+	ce1 := NewColumnListExpression("a", "b")
+	c := NewUpdateClauses().SetFrom(ce1)
+	ce2 := NewColumnListExpression("a", "b")
+	c2 := c.SetFrom(ce2)
+
+	assert.Equal(t, ce1, c.From())
+
+	assert.Equal(t, ce2, c2.From())
+}
+
 func (ucs *updateClausesSuite) TestWhere() {
 	t := ucs.T()
 	w := Ex{"a": 1}

expressions.go

@@ -192,6 +192,12 @@ func Literal(sql string, args ...interface{}) exp.LiteralExpression {
 	return L(sql, args...)
 }
 
+// Create a new SQL value ( alias for goqu.L("?", val) ). The prrimary use case for this would be in selects.
+// See examples.
+func V(val interface{}) exp.LiteralExpression {
+	return exp.NewLiteralExpression("?", val)
+}
+
 // Creates a new Range to be used with a Between expression
 //    exp.C("col").Between(exp.Range(1, 10))
 func Range(start, end interface{}) exp.RangeVal {