Bug fixes and added a SQLQuery class that is incomplete

src/zutil/db/SQLQuery.java

@@ -0,0 +1,140 @@
+package zutil.db;
+
+import java.util.ArrayList;
+import java.util.LinkedList;
+
+/**
+ * A class that generates a query by objects, minimizes errors
+ * 
+ * @author Ziver
+ */
+public class SQLQuery {
+	protected abstract class SQLQueryItem{
+		public abstract void getString(StringBuilder query);
+		
+		public String toString(){
+			StringBuilder query = new StringBuilder();
+			this.getString(query);
+			return query.toString();
+		}
+	}
+
+	//*******************************************
+	// Main Types
+	protected class Select extends SQLQueryItem{
+		String[] params;
+
+		/**
+		 * @param		params		is the columns that you want out of the SELECT query, leave empty for all columns
+		 */
+		public Select(String ...params ){
+			this.params = params;
+		}
+		
+		public void getString(StringBuilder query) {
+			query.append("SELECT ");
+			if( params == null )
+				query.append("* ");
+			else{
+				for(int i=0; i<params.length ;i++){
+					query.append(params[i]);
+					if( i != params.length-1 )
+						query.append(", ");
+				}
+				query.append(' ');
+			}			
+		}
+		
+		public From FROM(String table){
+			return new From(table);
+		}
+	}
+	
+	protected class Update extends SQLQueryItem{
+		public void getString(StringBuilder query) {
+			
+		}
+	}
+	
+	protected class Delete extends SQLQueryItem{
+		public void getString(StringBuilder query) {
+			
+		}
+	}
+	
+	//*******************************************
+	// Sub Types
+	protected class From extends SQLQueryItem{
+		ArrayList<String> tables;
+
+		public From(String ...tables){
+			this.tables = new ArrayList<String>();
+			for( String table : tables )
+				this.tables.add(table);
+		}
+		
+		public From NATURALJOIN(String ...tables){
+			return joinTable("NATURAL JOIN", tables);
+		}
+		
+		public From JOIN(String ...tables){
+			return joinTable("JOIN", tables);
+		}
+		
+		public From UNION(String ...tables){
+			return joinTable("UNION", tables);
+		}
+		
+		private From joinTable(String type, String[] tables){
+			StringBuilder str = new StringBuilder();
+			for(int i=0; i<tables.length ;i++){
+				str.append(tables[i]);
+				if( i != tables.length-1 )
+					str.append(' ').append(type).append(' ');
+			}
+			str.append(' ');
+			this.tables.add(str.toString());
+			return this;
+		}
+		
+		public void getString(StringBuilder query) {
+			query.append("FROM ");
+			if( tables.isEmpty() )
+				throw new RuntimeException("The FROM query item must hav atleast 1 table!");
+			for(int i=0; i<tables.size() ;i++){
+				query.append(tables.get(i));
+				if( i != tables.size()-1 )
+					query.append(", ");
+			}
+			query.append(' ');
+		}
+	}
+	
+	
+	//*******************************************
+	// Condition Types
+	protected class Where extends SQLQueryItem{
+		
+		public void getString(StringBuilder query) {
+			
+		}
+	}
+	
+	//*******************************************
+	// Sorting Types
+	
+	
+	//*******************************************
+	public Select SELECT(){
+		return new Select();
+	}
+	
+	public Update UPDATE(){
+		return new Update();
+	}
+	
+	public Delete DELETE(){
+		return new Delete();
+	}
+	
+}