实现削峰套利策略的编辑页面

src/database/SQL.cpp

@@ -0,0 +1,64 @@
+#include "SQL.h"
+
+std::string SQL::str()
+{
+    if (type == TYPE::select)
+    {
+        // SELECT * from t_tabname WHERE  id='1';
+        if (sql_k.empty()) {}
+        std::string s = "SELECT " + (sql_k.empty() ? "*" : sql_k) + " FROM `" + tabname + "`";
+        if (!sql_c.empty()) { s += (" WHERE" + sql_c); }
+        return s + ";";
+    }
+    else if (type == TYPE::update)
+    {
+        // UPDATE t_tabname SET a='1', b='2' WHERE id='1';
+        std::string s = "UPDATE `" + tabname + "` SET " + sql_k + " WHERE" + sql_c;
+        return s + ";";
+    }
+    else if (type == TYPE::insert)
+    {
+        // INSERT INTO t_tabname (a,b,c) VALUES('1','2','3');
+        std::string s = "INSERT INTO `" + tabname + "` (" + sql_k + ") VALUES(" + sql_v + ");";
+        return s;
+    }
+    else if (type == TYPE::del)
+    {
+        return "";
+    }
+    return "";
+}
+
+SQL& SQL::table(std::string t)
+{
+    tabname = t;
+    return *this;
+}
+
+SQL& SQL::select(std::string k)
+{
+    if (!sql_k.empty()) { sql_k += ","; }
+    sql_k += k;
+    return *this;
+}
+SQL& SQL::where(std::string expr)
+{
+    sql_c += (" " + expr);
+    return *this;
+}
+
+SQL& SQL::update(std::string k, std::string v)
+{
+    if (!sql_k.empty()) { sql_k += ","; }
+    sql_k += ("`" + k + "`='" + v + "'");
+    return *this;
+}
+
+SQL& SQL::insert(std::string k, std::string v)
+{
+    if (!sql_k.empty()) { sql_k += ","; }
+    sql_k += ("`" + k + "`");
+    if (!sql_v.empty()) { sql_v += ","; }
+    sql_v += ("'" + v + "'");
+    return *this;
+}