# Functions
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# Constants
ColKeyMul 一个非唯一索引的第一列，且该列允许多个相同的值。.
ColKeyNull 没有被索引，或者只是一个多列非唯一索引的次要列.
ColKeyPri 主键，或者是一个多列主键的一部分。.
ColKeyUni 唯一索引的第一列。 （唯一索引允许多个 NULL 值，但你可以通过检查 IS_NULLABLE 列来判断列是否允许 NULL。）.
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# Variables
QueryColumnMeta 用于查询表字段元数据的Sql语言 在DataSourceManager初始化后，如果配置表上有配置这条Sql语言，则覆盖.
QueryTableMeta 用于查询表元数据的Sql语言 在DataSourceManager初始化后，如果配置表上有配置这条Sql语言，则覆盖.
# Structs
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# Interfaces
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# Type aliases
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