Support single quoted string in INSERT query (#145)

Single quoted string is now supported in INSERT.
INSERT INTO Foo VALUES ("hello", 'world');

src/data/value.rs

@@ -306,6 +306,9 @@ impl Value {
             (DataType::Boolean, AstValue::Boolean(v)) => {
                 Ok(nullable.into_value(Value::OptBool(Some(*v)), Value::Bool(*v)))
             }
+            (DataType::Text, AstValue::SingleQuotedString(v)) => {
+                Ok(nullable.into_value(Value::OptStr(Some(v.clone())), Value::Str(v.clone())))
+            }
             (DataType::Int, AstValue::Null) => nullable.as_result(
                 Value::OptI64(None),
                 ValueError::NullValueOnNotNullField.into(),

src/tests/sql_types.rs

@@ -17,12 +17,13 @@ test_case!(sql_types, async move {
             (id,   content, verified, ratio)
         VALUES
             ( 1, \"Hello\",     True,   0.1),
-            ( 1, \"World\",    False,   0.9);
+            ( 1, \"World\",    False,   0.9),
+            ( 1,    'test',    False,   0.0);
     "
     );
 
     let test_sqls = [
-        (2, "SELECT * FROM Item;"),
+        (3, "SELECT * FROM Item;"),
         (1, "SELECT * FROM Item WHERE verified = True;"),
         (1, "SELECT * FROM Item WHERE ratio > 0.5;"),
         (1, "SELECT * FROM Item WHERE ratio = 0.1;"),
@@ -32,8 +33,10 @@ test_case!(sql_types, async move {
         ),
         (0, "SELECT * FROM Item WHERE content=\"World\";"),
         (1, "SELECT * FROM Item WHERE content=\"Foo\";"),
+        (1, "SELECT * FROM Item WHERE content='Foo';"),
         (1, "UPDATE Item SET id = 11 WHERE content=\"Foo\";"),
-        (2, "SELECT * FROM Item;"),
+        (1, "UPDATE Item SET id = 14 WHERE content='Foo';"),
+        (3, "SELECT * FROM Item;"),
     ];
 
     for (num, sql) in test_sqls.iter() {