Misc bugfixes, doc updates

src/drivers.rs

@@ -102,7 +102,9 @@ pub trait DatabaseDriver {
     }
 
     // Runs a basic sql query on the database
-    // fn query(&self, sql: &str) -> Result<impl Any, impl Error>;
+    fn query(&self, sql: &str) -> Result<Box<dyn Any>, Box<dyn Any>> {
+        Ok(Box::new(String::from(sql)))
+    }
 
     /// Prepares an sql statement for the database
     fn prepare(&self, sql: &str) -> Result<(), ()> {

src/drivers/postgres.rs

@@ -33,18 +33,6 @@ impl PostgresDriver {
 
         self.connection = RefCell::new(Some(connection));
     }
-
-    pub fn query(&self, sql: &str) -> Result<Vec<Row>, Error> {
-        if self.connection.borrow().is_none() {
-            panic!("No database connection.");
-        }
-
-        self.connection
-            .borrow_mut()
-            .as_mut()
-            .unwrap()
-            .query(sql, &[])
-    }
 }
 
 impl DatabaseDriver for PostgresDriver {
@@ -55,4 +43,22 @@ impl DatabaseDriver for PostgresDriver {
     fn random(&self) -> String {
         String::from(" RANDOM()")
     }
+
+    fn query(&self, sql: &str) -> Result<Box<dyn Any>, Box<dyn Any>> {
+        if self.connection.borrow().is_none() {
+            panic!("No database connection.");
+        }
+
+        let result = self
+            .connection
+            .borrow_mut()
+            .as_mut()
+            .unwrap()
+            .query(sql, &[]);
+
+        match result {
+            Ok(res) => Ok(Box::new(res)),
+            Err(e) => Err(Box::new(e)),
+        }
+    }
 }

src/lib.rs

@@ -35,12 +35,7 @@ pub mod prelude {
     //! This includes enum types, traits,
     //! the Query Builder, and individual database drivers.
     pub use crate::drivers::DatabaseDriver;
-    pub use crate::query_builder::{
+    pub use crate::query_builder::{JoinType, LikeWildcard, OrderDirection, QueryBuilder};
-        JoinType,
-        LikeWildcard,
-        OrderDirection,
-        QueryBuilder,
-    };
 
     #[cfg(feature = "postgres")]
     /// Postgres Driver

src/query_builder.rs

@@ -79,7 +79,36 @@ enum QueryType {
     Delete,
 }
 
-/// The struct representing a query builder
+/// QueryBuilder for general SQL queries
+///
+/// ```
+/// use stringqb::prelude::*;
+///
+/// // You probably do not want to use the default driver, as it
+/// // is basically a mock for testing
+/// use stringqb::drivers::DefaultDriver;
+///
+/// // The query builder must be mutable to be useful
+/// let mut qb = QueryBuilder::new(DefaultDriver::new());
+///
+/// // Each builder method returns a mutable reference to itself so
+/// // the methods are chainable
+/// qb.select("field as f")
+///     .from("table t")
+///     .inner_join("table_two tt", "field2 as ff", "=", "f")
+///     .wher("f >", 3);
+///
+/// // Since they are references, you do not have to chain.
+/// let sql = qb.get_compiled_select();
+///
+/// # assert_eq!(
+/// #    sql,
+/// #    r#"SELECT "field" AS "f"
+/// FROM "table" "t"
+/// INNER JOIN "table_two" "tt" ON "field2" AS "ff"=f
+/// WHERE "f" > ?"#
+/// # );
+/// ```
 pub struct QueryBuilder {
     /// The struct to store the query builder info
     state: QueryState,
@@ -87,9 +116,7 @@ pub struct QueryBuilder {
 }
 
 /// The struct representing a prepared statement
-pub struct Prepared {
+pub struct Prepared {}
-
-}
 
 impl Default for QueryBuilder {
     /// Creates a new QueryBuilder instance with default driver
@@ -109,19 +136,19 @@ impl QueryBuilder {
     /// ```no_run
     /// use stringqb::prelude::*;
     ///
-    /// // You probably do not want to use the default driver, as it
+    /// // Postgres Driver (If enabled)
-    /// // is basically a mock for testing
+    /// let pgDriver = PostgresDriver::new("postgres://");
-    /// use stringqb::drivers::DefaultDriver;
     ///
-    /// // The query builder must be mutable to be useful
+    /// #[cfg(feature = "sqlite")]
-    /// let mut qb = QueryBuilder::new(DefaultDriver::new());
+    /// // SQLite Driver (memory)
+    /// let liteMemoryDriver = SQLiteDriver::new(":memory:");
     ///
-    /// // Each builder method returns a mutable reference to itself so
+    /// #[cfg(feature = "sqlite")]
-    /// // the methods are chainable
+    /// // SQLite Driver (file)
-    /// qb.select("field f").from("table");
+    /// let liteDriver = SQLiteDriver::new("/path/to/db.sqlite3");
     ///
-    /// // Since they are references, you do not have to chain.
+    /// // The variable to the query builder must be mutable
-    /// let sql = qb.get_compiled_select();
+    /// let mut queryBuilder = QueryBuilder::new(pgDriver);
     /// ```
     pub fn new(driver: impl DatabaseDriver + 'static) -> Self {
         QueryBuilder {
@@ -137,28 +164,13 @@ impl QueryBuilder {
     /// Set the fields to select from the database as a string
     ///
     /// ```no_run
-    /// # let mut qb = stringqb::query_builder::QueryBuilder::default();
+    /// # use stringqb::prelude::*;
+    /// # let mut qb = QueryBuilder::default();
     /// // You can also alias field names
     /// qb.select("foo as bar");
     /// ```
     pub fn select(&mut self, fields: &str) -> &mut Self {
-        lazy_static! {
+        let fields = self.quote_fields(fields);
-            static ref RE: Regex = Regex::new(r"(?i) as ").unwrap();
-        };
-
-        let fields = split_map_join(fields, ",", |s| {
-            if !RE.is_match(s) {
-                return self.driver.quote_identifier(s.trim());
-            }
-
-            // Do a operation similar to split_map_join for the
-            // regex matches, quoting each identifier
-            RE.split(s)
-                .into_iter()
-                .map(|p| self.driver.quote_identifier(p))
-                .collect::<Vec<String>>()
-                .join(" as ")
-        });
 
         self.state.append_select_string(&fields);
 
@@ -168,7 +180,8 @@ impl QueryBuilder {
     /// Set the fields to select from the database as a Vector
     ///
     /// ```no_run
-    /// # let mut qb = stringqb::query_builder::QueryBuilder::default();
+    /// # use stringqb::prelude::*;
+    /// # let mut qb = QueryBuilder::default();
     /// // You can also alias via a vector of fields
     /// qb.select_vec(vec!["foo as bar", "baz"]);
     /// ```
@@ -195,8 +208,9 @@ impl QueryBuilder {
     /// Specify the database table to select from
     ///
     /// ```no_run
-    /// # let mut qb = stringqb::query_builder::QueryBuilder::default();
+    /// # use stringqb::prelude::*;
-    /// // You can specifiy an alias for the table
+    /// # let mut qb = QueryBuilder::default();
+    /// // You can specify an alias for the table
     /// qb.from("products p");
     /// ```
     pub fn from(&mut self, table_name: &str) -> &mut Self {
@@ -215,7 +229,7 @@ impl QueryBuilder {
     ///
     /// ```no_run
     /// # use stringqb::prelude::*;
-    /// # let mut qb = stringqb::query_builder::QueryBuilder::default();
+    /// # let mut qb = QueryBuilder::default();
     /// // Search for a value that ends with "foo"
     /// qb.like("field", String::from("foo"), LikeWildcard::Before);
     ///
@@ -233,7 +247,7 @@ impl QueryBuilder {
     ///
     /// ```no_run
     /// # use stringqb::prelude::*;
-    /// # let mut qb = stringqb::query_builder::QueryBuilder::default();
+    /// # let mut qb = QueryBuilder::default();
     /// // Search for a value that ends with "foo"
     /// qb.or_like("field", String::from("foo"), LikeWildcard::Before);
     ///
@@ -251,7 +265,7 @@ impl QueryBuilder {
     ///
     /// ```no_run
     /// # use stringqb::prelude::*;
-    /// # let mut qb = stringqb::query_builder::QueryBuilder::default();
+    /// # let mut qb = QueryBuilder::default();
     /// // Search for a value that does not end with "foo"
     /// qb.not_like("field", String::from("foo"), LikeWildcard::Before);
     ///
@@ -269,7 +283,7 @@ impl QueryBuilder {
     ///
     /// ```no_run
     /// # use stringqb::prelude::*;
-    /// # let mut qb = stringqb::query_builder::QueryBuilder::default();
+    /// # let mut qb = QueryBuilder::default();
     /// // Search for a value that does not end with "foo"
     /// qb.or_not_like("field", String::from("foo"), LikeWildcard::Before);
     ///
@@ -393,16 +407,37 @@ impl QueryBuilder {
     }
 
     /// Specify a `where in` clause for the query, prefixed with `or`
+    ///
+    /// ```no_run
+    /// # use stringqb::prelude::*;
+    /// # let mut qb = QueryBuilder::default();
+    /// // Look for a set of rows matching the values passed
+    /// qb.or_where_in("key", vec![1,2,3]);
+    /// ```
     pub fn or_where_in(&mut self, key: &str, values: Vec<impl Any>) -> &mut Self {
         self._where_in(key, values, "IN", "OR")
     }
 
     /// Specify a `where not in` clause for the query
+    ///
+    /// ```no_run
+    /// # use stringqb::prelude::*;
+    /// # let mut qb = QueryBuilder::default();
+    /// // Look for a set of rows not matching the values passed
+    /// qb.where_not_in("key", vec![1,2,3]);
+    /// ```
     pub fn where_not_in(&mut self, key: &str, values: Vec<impl Any>) -> &mut Self {
         self._where_in(key, values, "NOT IN", "AND")
     }
 
     /// Specify a `where not in` clause for the query, prefixed with `or`
+    ///
+    /// ```no_run
+    /// # use stringqb::prelude::*;
+    /// # let mut qb = QueryBuilder::default();
+    /// // Look for a set of rows not matching the values passed
+    /// qb.or_where_not_in("key", vec![1,2,3]);
+    /// ```
     pub fn or_where_not_in(&mut self, key: &str, values: Vec<impl Any>) -> &mut Self {
         self._where_in(key, values, "NOT IN", "OR")
     }
@@ -412,6 +447,15 @@ impl QueryBuilder {
     // --------------------------------------------------------------------------
 
     /// Set a key and value for an insert or update query
+    ///
+    /// ```no_run
+    /// # use stringqb::prelude::*;
+    /// # let mut qb = QueryBuilder::default();
+    /// // Can be called multiple times to set multiple values
+    /// qb.set("foo", 3)
+    ///     .set("bar", 4)
+    ///     .insert("table");
+    /// ```
     pub fn set(&mut self, key: &str, value: impl Any) -> &mut Self {
         let key = self.driver.quote_identifier(key);
         self.state
@@ -431,11 +475,25 @@ impl QueryBuilder {
     }
 
     /// Convenience method for a `left` join
+    ///
+    /// ```no_run
+    /// # use stringqb::prelude::*;
+    /// # let mut qb = QueryBuilder::default();
+    /// // Note that the value is not prepared/escaped, due to it often being a column
+    /// qb.left_join("table1", "column1", "<>", "foo");
+    /// ```
     pub fn left_join(&mut self, table: &str, col: &str, op: &str, value: &str) -> &mut Self {
         self.join(table, col, op, value, JoinType::Left)
     }
 
     /// Convenience method for an `inner` join
+    ///
+    /// ```no_run
+    /// # use stringqb::prelude::*;
+    /// # let mut qb = QueryBuilder::default();
+    /// // Note that the value is not prepared/escaped, due to it often being a column
+    /// qb.inner_join("table1", "column1", "<>", "foo");
+    /// ```
     pub fn inner_join(&mut self, table: &str, col: &str, op: &str, value: &str) -> &mut Self {
         self.join(table, col, op, value, JoinType::Inner)
     }
@@ -445,7 +503,7 @@ impl QueryBuilder {
     /// ```no_run
     /// # use stringqb::prelude::*;
     /// # let mut qb = QueryBuilder::default();
-    /// // Note that the value is not escaped, due to it often being a column
+    /// // Note that the value is not prepared/escaped, due to it often being a column
     /// qb.join("table1", "column1", "<>", "foo", JoinType::Inner);
     /// ```
     pub fn join(
@@ -456,9 +514,16 @@ impl QueryBuilder {
         value: &str,
         join_type: JoinType,
     ) -> &mut Self {
-        let table = self.driver.quote_identifier(table);
+        let col = self.quote_fields(col);
-        let col = self.driver.quote_identifier(col);
+        let table = self.quote_table(table);
-        let condition = table + " ON " + &col + op + value;
+
+        let condition = format!(
+            "{} ON {}{}{}",
+            table,
+            &col,
+            op,
+            value
+        );
 
         let join_type = match join_type {
             JoinType::Cross => "CROSS ",
@@ -520,6 +585,11 @@ impl QueryBuilder {
 
     ///  Add an offset to the query
     pub fn offset(&mut self, offset: usize) -> &mut Self {
+        assert!(
+            self.state.offset.is_some(),
+            "You must set a limit to set an offset"
+        );
+
         self.state.offset = Some(offset);
 
         self
@@ -531,16 +601,28 @@ impl QueryBuilder {
 
     /// Start a logical grouping in the current query
     pub fn group_start(&mut self) -> &mut Self {
+        let conj = if ! self.state.has_where_clause() {
+            "\nWHERE "
+        } else {
+            " "
+        };
+
         self.state
-            .append_query_map(QueryClauseType::GroupStart, " ", "(");
+            .append_query_map(QueryClauseType::GroupStart, conj, "(");
 
         self
     }
 
     /// Start a logical grouping, prefixed with `not`
     pub fn not_group_start(&mut self) -> &mut Self {
+        let conj = if ! self.state.has_where_clause() {
+            "\nWHERE "
+        } else {
+            " AND "
+        };
+
         self.state
-            .append_query_map(QueryClauseType::GroupStart, " AND ", "NOT (");
+            .append_query_map(QueryClauseType::GroupStart, conj, "NOT (");
 
         self
     }
@@ -580,7 +662,7 @@ impl QueryBuilder {
     /// # let mut qb = QueryBuilder::default();
     /// // The get() method actually calls the driver to run
     /// // the SQL query
-    /// let query = db.select_vec(vec!["foo", "bar"])
+    /// let query = qb.select_vec(vec!["foo", "bar"])
     ///     .from("table t")
     ///     .get();
     /// ```
@@ -602,7 +684,7 @@ impl QueryBuilder {
     /// # let mut qb = QueryBuilder::default();
     /// // The insert() method actually calls the driver to run
     /// // the SQL query
-    /// let query = db.set("foo", 3)
+    /// let query = qb.set("foo", 3)
     ///     .insert("table");
     /// ```
     pub fn insert(&mut self, table: &str) {
@@ -618,7 +700,7 @@ impl QueryBuilder {
     /// # let mut qb = QueryBuilder::default();
     /// // The update() method actually calls the driver to run
     /// // the SQL query
-    /// let query = db.set("foo", 3)
+    /// let query = qb.set("foo", 3)
     ///     .wher("foo", 4)
     ///     .update("table");
     /// ```
@@ -629,6 +711,15 @@ impl QueryBuilder {
     }
 
     /// Execute the generated delete query
+    ///
+    /// ```no_run
+    /// # use stringqb::prelude::*;
+    /// # let mut qb = QueryBuilder::default();
+    /// // The delete() method actually calls the driver to run
+    /// // the SQL query
+    /// let query = qb.wher("foo", 3)
+    ///     .delete("table");
+    /// ```
     pub fn delete(&mut self, table: &str) {
         let sql = self.get_compiled_delete(table);
 
@@ -670,14 +761,14 @@ impl QueryBuilder {
     // --------------------------------------------------------------------------
 
     /// Get a new instance of the query builder
-    pub fn reset(&mut self) -> &Self {
+    pub fn reset(&mut self) -> &mut Self {
         self.state = QueryState::new();
 
         self
     }
 
     /// Execute an SQL query with no parameters
-    pub fn basic_query(&mut self, sql: &str) {
+    pub fn basic_query(&mut self, sql: &str) -> Result<Box<dyn Any>, Box<dyn Any>> {
         self.driver.query(sql)
     }
 
@@ -691,6 +782,32 @@ impl QueryBuilder {
         unimplemented!();
     }
 
+    /// Quotes table column(s)/field(s) accounting for 'as' aliases
+    fn quote_fields(&mut self, fields: &str) -> String {
+        lazy_static! {
+            static ref RE: Regex = Regex::new(r"(?i) as ").unwrap();
+        };
+
+        split_map_join(fields, ",", |s| {
+            if !RE.is_match(s) {
+                return self.driver.quote_identifier(s.trim());
+            }
+
+            // Do a operation similar to split_map_join for the
+            // regex matches, quoting each identifier
+            RE.split(s)
+                .into_iter()
+                .map(|p| self.driver.quote_identifier(p))
+                .collect::<Vec<String>>()
+                .join(" AS ")
+        })
+    }
+
+    /// Quotes table(s), accounting for aliases
+    pub fn quote_table(&mut self, table: &str) -> String {
+        split_map_join(table, " ", |s| self.driver.quote_identifier(s))
+    }
+
     // --------------------------------------------------------------------------
     // ! Implementation Details
     // --------------------------------------------------------------------------
@@ -703,6 +820,12 @@ impl QueryBuilder {
         like: &str,
         conj: &str,
     ) -> &mut Self {
+        let conj = if ! self.state.has_where_clause() {
+            "\nWHERE "
+        } else {
+            conj
+        };
+
         let field = self.driver.quote_identifier(field);
 
         let like = format!("{} {} ?", field, like);
@@ -775,6 +898,12 @@ impl QueryBuilder {
 
         let str = format!("{} {} ({}) ", key, in_str, placeholders.join(","));
 
+        let conj = if ! self.state.has_where_clause() {
+            "\nWHERE "
+        } else {
+            conj
+        };
+
         self.state
             .append_query_map(QueryClauseType::WhereIn, conj, &str);
 
@@ -805,21 +934,29 @@ impl QueryBuilder {
 
         item += &item2;
 
+        let conj = if self.state.query_map.len() == 0 || ( ! self.state.has_where_clause()) {
+            String::from("\nWHERE")
+        } else {
+            String::from(conj)
+        };
+
         let conj = if last_item.is_some() {
             let last_item = last_item.unwrap();
 
             match last_item.clause_type {
                 QueryClauseType::GroupStart => String::from(""),
-                _ => format!(" {} ", conj),
+                _ => format!("{} ", conj),
             }
         } else {
-            format!(" {} ", conj)
+            format!("{} ", conj)
         };
 
         self.state
             .append_query_map(QueryClauseType::Where, &conj, &item);
     }
 
+
+
     fn compile(&self, query_type: QueryType, table: &str) -> String {
         // Get the base clause for the query
         let base_sql = self.compile_type(query_type, &self.driver.quote_identifier(table));
@@ -893,7 +1030,7 @@ impl QueryBuilder {
         // @TODO determine query result type
         // @TODO prepare/execute query, and return result
         let stmt = self.prepare(sql);
-        self.execute(&stmt, values)
+        self.execute(&stmt, &values)
     }
 }
 
@@ -1041,12 +1178,6 @@ impl QueryState {
     }
 
     fn append_query_map(&mut self, clause_type: QueryClauseType, conj: &str, s: &str) -> &mut Self {
-        let conj = if self.query_map.len() == 0 {
-            " WHERE "
-        } else {
-            conj
-        };
-
         self.query_map.push(QueryClause::new(clause_type, conj, s));
 
         self
@@ -1110,6 +1241,20 @@ impl QueryState {
         &mut self.where_values
     }
 
+    fn has_where_clause(&self) -> bool {
+        let has_clause = false;
+
+        for clause in self.query_map.iter() {
+            match clause.clause_type {
+                QueryClauseType::Where => return true,
+                QueryClauseType::WhereIn => return true,
+                _ => (),
+            }
+        }
+
+        has_clause
+    }
+
     fn set_from_string(&mut self, s: &str) -> &mut Self {
         self.from_string = String::from(s);
 
@@ -1172,7 +1317,7 @@ mod tests {
         qb.from("test").where_in("foo", vec![0, 1, 2, 3, 4, 5]);
 
         let sql = qb.get_compiled_select();
-        let expected = "SELECT *\nFROM \"test\" WHERE \"foo\" IN (?,?,?,?,?,?) ";
+        let expected = "SELECT *\nFROM \"test\"\nWHERE \"foo\" IN (?,?,?,?,?,?) ";
 
         assert_eq!(sql, expected);
     }

src/types.rs

@@ -86,8 +86,8 @@ pub enum ToDriverOutput<'a> {
 // Generically allow any type that can be converted into a ValueRef
 // to be converted into a ToSqlOutput as well.
 impl<'a, T: ?Sized> From<&'a T> for ToDriverOutput<'a>
-    where
+where
-        &'a T: Into<ValueRef<'a>>,
+    &'a T: Into<ValueRef<'a>>,
 {
     fn from(t: &'a T) -> Self {
         ToDriverOutput::Borrowed(t.into())
@@ -120,16 +120,13 @@ impl<'a, T: ?Sized> From<&'a T> for ToDriverOutput<'a>
 //from_value!(f64);
 //from_value!(Vec<u8>);
 
-
 /// Types that can be converted to a type that the driver understands
 pub trait ToDriver {
     fn to_driver(&self) -> Result<ToDriverOutput<'_>, ()>;
 }
 
 /// A trait for types that can be created from the result of a query on the driver
-pub trait FromDriver: Sized {
+pub trait FromDriver: Sized {}
-
-}
 
 /// Enum struct for mapping between database and Rust types
 #[derive(Clone, Copy, PartialEq, PartialOrd, Eq, Ord, Debug, Hash)]

tests/integration_test.rs

@@ -15,7 +15,7 @@ fn select_keys_as_query() {
 
     let sql = qb.select("foo as bar, baz").from("a").get_compiled_select();
 
-    assert_eq!(sql, "SELECT \"foo\" as \"bar\",\"baz\"\nFROM \"a\"");
+    assert_eq!(sql, "SELECT \"foo\" AS \"bar\",\"baz\"\nFROM \"a\"");
 }
 
 #[test]
@@ -54,7 +54,7 @@ fn select_where() {
     qb.from("test").r#where("foo", "bar");
 
     let sql = qb.get_compiled_select();
-    let expected = "SELECT *\nFROM \"test\" WHERE \"foo\"=?";
+    let expected = "SELECT *\nFROM \"test\"\nWHERE \"foo\"=?";
 
     assert_eq!(sql, expected);
 }
@@ -66,7 +66,7 @@ fn select_where_in() {
     qb.from("test").where_in("foo", vec![0, 1, 2, 3, 4, 5]);
 
     let sql = qb.get_compiled_select();
-    let expected = "SELECT *\nFROM \"test\" WHERE \"foo\" IN (?,?,?,?,?,?) ";
+    let expected = "SELECT *\nFROM \"test\"\nWHERE \"foo\" IN (?,?,?,?,?,?) ";
 
     assert_eq!(sql, expected);
 }