Implement the remaining query builder methods, except those that call the database

src/enums.rs

@@ -44,7 +44,7 @@ pub enum OrderDirection {
 }
 
 /// The type of Query Clause
-#[derive(Debug)]
+#[derive(Debug, PartialEq)]
 pub enum QueryClauseType {
     /// Ending a parenthetical grouping
     GroupEnd,

src/main.rs

@@ -11,7 +11,7 @@ fn main() {
         .set("buzz", Box::new((1, 2.0, true, 'q')));
 
     // This just makes me sad
-    qb.r#where("foo", "<>", Box::new(2));
+    qb.r#where("foo <>", Box::new(2));
 
     println!("QueryBuilder object: {:#?}", &qb);
 

src/query_builder.rs

@@ -124,6 +124,14 @@ impl QueryBuilder {
         self
     }
 
+    /// Tell the database to give you query plain info, rather
+    /// than a result set
+    pub fn explain(&mut self) -> &mut Self {
+        self.state.explain = true;
+
+        self
+    }
+
     /// Specify the database table to select from
     ///
     /// ```
@@ -195,22 +203,31 @@ impl QueryBuilder {
     // ! 'Where' methods
     // --------------------------------------------------------------------------
 
-    /// Specify a condition for the `where` clause of the query
-    pub fn r#where(&mut self, key: &str, op: &str, value: Box<dyn Any>) -> &mut Self {
-        // @TODO actually implement setting the keys for the where
-        self.state.append_where_values(value);
-
-        unimplemented!();
+    /// Alias method for `r#where`.
+    pub fn filter(&mut self, key: &str, value: Box<dyn Any>) -> &mut Self {
+        self.r#where(key, value)
     }
 
-    /// Specify a condition for a `where` clause where a column has a value
-    pub fn where_eq(&mut self, key: &str, value: Box<dyn Any>) -> &mut Self {
-        self.r#where(key, "=", value)
+    /// Specify a condition for the `where` clause of the query. Can be called
+    /// multiple times, which will then add additional where conditions, prefixed
+    /// with 'AND'.
+    ///
+    /// ```no_run
+    /// # use stringqb::prelude::*;
+    /// # let mut qb = QueryBuilder::default();
+    /// // By default, key = value
+    /// qb.r#where("key", Box::new("value"));
+    ///
+    /// // Other operators can be used with a separating space
+    /// qb.r#where("key >", Box::new(4));
+    /// ```
+    pub fn r#where(&mut self, key: &str, value: Box<dyn Any>) -> &mut Self {
+        self._where_string(key, value, "AND")
     }
 
     /// Specify a condition for the `where` clause of the query, prefixed with `or`
     pub fn or_where(&mut self, key: &str, value: Box<dyn Any>) -> &mut Self {
-        unimplemented!();
+        self._where_string(key, value, "OR")
     }
 
     /// Specify a `where in` clause for the query
@@ -549,8 +566,38 @@ impl QueryBuilder {
         self
     }
 
-    fn _where_string(&mut self, key: &str, value: Box<dyn Any>) -> &mut Self {
-        unimplemented!();
+    fn _where_string(&mut self, key: &str, value: Box<dyn Any>, conj: &str) -> &mut Self {
+        let keys = self._where(key, vec![value]);
+
+        for k in keys {
+            self._where_string_key(key, conj);
+        }
+
+        self
+    }
+
+    fn _where_string_key(&mut self, key: &str, conj: &str) {
+        let field = key.trim().split(" ").collect::<Vec<&str>>();
+        let query_map = self.state.get_query_map();
+
+        let last_item = &query_map[query_map.len() - 1];
+        let mut item = self.driver.quote_identifier(field[0]);
+
+        let item2 = if field.len() == 1 {
+            String::from("=?")
+        } else {
+            format!(" {} ?", &field[1])
+        };
+
+        item += &item2;
+
+        let conj = if last_item.clause_type == QueryClauseType::GroupStart {
+            String::from("")
+        } else {
+            format!(" {} ", conj)
+        };
+
+        self.state.append_query_map(QueryClauseType::Where, &conj, &item);
     }
 
     fn compile(&self, query_type: QueryType, table: &str) -> String {
@@ -570,12 +617,18 @@ impl QueryBuilder {
             &parts.push(clause.to_string());
         }
 
-        let sql = parts.join("");
+        let mut sql = parts.join("");
 
-        // @TODO handle limit / offset
+        // Add limit/ offset
+        sql = self.driver.limit(&sql, self.state.limit, self.state.offset);
 
+        // Handle explain
+        if self.state.explain == true {
+            self.driver.explain(&sql)
+        } else {
             sql
         }
+    }
 
     fn compile_type(&self, query_type: QueryType, table: &str) -> String {
         match query_type {

src/query_builder/query_state.rs

@@ -2,7 +2,7 @@ use super::*;
 
 #[derive(Debug)]
 pub struct QueryClause {
-    clause_type: QueryClauseType,
+    pub clause_type: QueryClauseType,
     conjunction: String,
     string: String,
 }
@@ -23,6 +23,8 @@ impl QueryClause {
 
 #[derive(Debug)]
 pub struct QueryState {
+    pub explain: bool,
+
     select_string: String,
     from_string: String,
     set_string: String,
@@ -58,6 +60,8 @@ pub struct QueryState {
 impl Default for QueryState {
     fn default() -> Self {
         QueryState {
+            explain: false,
+
             select_string: String::from(""),
             from_string: String::from(""),
             set_string: String::from(""),