表格存储：DefinedColumnType

枚举取值列表

• DCT_INTEGER：整数

• DCT_DOUBLE：浮点数

• DCT_BOOLEAN：布尔值

• DCT_STRING：字符串

• DCT_BLOB：二进制

enum DefinedColumnType {
    DCT_INTEGER = 1;
    DCT_DOUBLE = 2;
    DCT_BOOLEAN = 3;
    DCT_STRING = 4;
    DCT_BLOB = 7;
}