com.supermap.data
Class JoinType
- java.lang.Object
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- com.supermap.data.Enum
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- com.supermap.data.JoinType
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public final class JoinType extends Enum
This class defines the the connection type constant between two tables.This class is used to determine the record in the query result when query two connected tables.
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Field Detail
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INNERJOIN
public static final JoinType INNERJOIN
Inner join. When the two tables are joined with inner joint type, only the records exist in both tables will be returned as the result, besides meeting the query condition. The UDB engine is not supported the Inner join.
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LEFTJOIN
public static final JoinType LEFTJOIN
Left join. When the two tables are joined with left join type, all the records that meet query condition in the left table, that is the main table , will be returned, and if there is no relevant record in the right table (the exterior table), the corresponding filed values will be empty.
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