Sqlite插入单引号和双引号，防止sql注入

1. 方法1

• sqlite3_mprintf替换sprintf,
• '%q'替换'%s'.

1.1. 举例

修改前代码

	//修改前, hello'123写入失败char sql[1000]char* sql = sprintf("UPDATE table SET name = '%s' WHERE name_id = %d","hello'123", 1);rc = sqlite3_exec(db, sql, NULL, NULL, &err_msg);if (rc != SQLITE_OK ){fprintf(stderr, "Failed to updata. \n");fprintf(stderr, "SQL error: %s\n", err_msg);sqlite3_free(err_msg);sqlite3_close(db);return -1;}/* 关闭 */sqlite3_close(db);return 0;

修改后代码

	//修改后，hello'123写入成功char* sql = sqlite3_mprintf("UPDATE table SET name = '%q' WHERE name_id = %d","hello'123", 1);rc = sqlite3_exec(db, sql, NULL, NULL, &err_msg);if (rc != SQLITE_OK ){fprintf(stderr, "Failed to updata. \n");fprintf(stderr, "SQL error: %s\n", err_msg);sqlite3_free(err_msg);sqlite3_close(db);sqlite3_free(sql);  //别忘了释放return -1;}/* 关闭 */sqlite3_close(db);sqlite3_free(sql);	//别忘了释放return 0;

2. 方法2

使用sqlite3_prepare_v2或prepare方式。

sql_query.prepare("INSERT INTO tables VALUES(?, ?);");
sql_query.addBindValue("hello'123");
sql_query.addBindValue("hello");
sql_query.exec();