Package com.mckoi.database.interpret
Class Insert
- java.lang.Object
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- com.mckoi.database.interpret.Statement
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- com.mckoi.database.interpret.Insert
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public class Insert extends Statement
The instance class that stores all the information about an insert statement for processing.- Author:
- Tobias Downer
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Constructor Summary
Constructors Constructor Description Insert()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description Table
evaluate()
Evaluates the statement and returns a table that represents the result set.void
prepare()
Prepares the statement with the given Database object.-
Methods inherited from class com.mckoi.database.interpret.Statement
addTable, Debug, init, resolveTree, resolveVariableName
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Method Detail
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prepare
public void prepare() throws DatabaseException
Description copied from class:Statement
Prepares the statement with the given Database object. This is called before the statement is evaluated. The prepare statement queries the database and resolves information about the statement (for example, it resolves column names and aliases and determines the tables that are touched by this statement so we can lock the appropriate tables before we evaluate).NOTE: Care must be taken to ensure that all methods called here are safe in as far as modifications to the data occuring. The rules for safety should be as follows. If the database is in EXCLUSIVE mode, then we need to wait until it's switched back to SHARED mode before this method is called. All collection of information done here should not involve any table state info. except for column count, column names, column types, etc. Queries such as obtaining the row count, selectable scheme information, and certainly 'getCellContents' must never be called during prepare. When prepare finishes, the affected tables are locked and the query is safe to 'evaluate' at which time table state is safe to inspect.
- Specified by:
prepare
in classStatement
- Throws:
DatabaseException
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evaluate
public Table evaluate() throws DatabaseException
Description copied from class:Statement
Evaluates the statement and returns a table that represents the result set. This is called after 'prepare'.- Specified by:
evaluate
in classStatement
- Throws:
DatabaseException
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