root / trunk / libraries / libGDBMS / src / main / java / com / hardcode / gdbms / engine / data / driver / ReadAccess.java @ 10627
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package com.hardcode.gdbms.engine.data.driver; |
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import com.hardcode.gdbms.driver.exceptions.ReadDriverException; |
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import com.hardcode.gdbms.engine.values.Value; |
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/**
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* Interfaz que define los m?todos de acceso de lectura
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*
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* @author Fernando Gonz?lez Cort?s
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*/
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public interface ReadAccess { |
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public final static int FIELD_TYPE_BOOLEAN = 0; |
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public final static int FIELD_TYPE_STRING = 5; |
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public final static int FIELD_TYPE_DOUBLE = 4; |
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public final static int FIELD_TYPE_FLOAT = 3; |
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public final static int FIELD_TYPE_LONGINT = 2; |
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public final static int FIELD_TYPE_INT = 1; |
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/**
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* Obtiene el valor que se encuentra en la fila y columna indicada
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*
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* @param rowIndex fila
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* @param fieldId columna
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*
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* @return subclase de Value con el valor del origen de datos. Never null (use
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* ValueFactory.createNullValue() instead)
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* @throws ReadDriverException TODO
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*/
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public abstract Value getFieldValue(long rowIndex, int fieldId) |
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throws ReadDriverException;
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/**
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* Obtiene el n?mero de campos del DataSource
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*
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* @return
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* @throws ReadDriverException TODO
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*/
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public abstract int getFieldCount() throws ReadDriverException; |
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/**
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* Devuelve el nombre del campo fieldId-?simo
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*
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* @param fieldId ?ndice del campo cuyo nombre se quiere obtener
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*
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* @return
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* @throws ReadDriverException TODO
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*/
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public abstract String getFieldName(int fieldId) throws ReadDriverException; |
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/**
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* Obtiene el n?mero de registros del DataSource
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*
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* @return
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* @throws ReadDriverException TODO
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*/
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public abstract long getRowCount() throws ReadDriverException; |
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/**
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* Devuelve el tipo del campo i?simo. Devuelve una constante de la clase
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* java.sql.Types
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*
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* @param i ?ndice del campo cuyo tipo se quiere conocer
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*
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* @return Class
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* @throws ReadDriverException TODO
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*/
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public abstract int getFieldType(int i) throws ReadDriverException; |
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/**
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* Devuelve el ancho del campo i?simo.
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*
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* @param i ?ndice del campo cuyo ancho se quiere conocer
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*
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* @return int
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* @throws ReadDriverException TODO
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*/
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public abstract int getFieldWidth(int i) throws ReadDriverException; |
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} |