/**
* @ 默认构造函数
* @connectionString 数据库连接字符串
* */
protected SQLHelper(SQLDataBaseType dbType, string connectionString)
: this(new SQLContext(dbType, connectionString))
{
}
/**
* @ 构造函数第一次重载，自动构造数据连接对象
* @ dbType 数据库类型
* @ connectionString 数据库连接字符串
* */
public SQLContext(SQLDataBaseType dbType, string connectionString)
{
this.dbType = dbType;
this.connectionString = connectionString;
}
