Interface IColumnMetaData
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public interface IColumnMetaDataDescribes the column metadata of a row.
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description java.lang.StringgetColumnAlias(int index)Returns the column alias at the specified index.intgetColumnCount()Returns the number of columns in a row of the result set.java.lang.StringgetColumnLabel(int index)Gets the label or display name of the column at the specified index.java.lang.StringgetColumnName(int index)Returns the column name at the specified index.java.lang.StringgetColumnNativeTypeName(int index)Returns the data provider specific data type name of the specified column.intgetColumnType(int index)Returns the data type of the column at the specified index.java.lang.StringgetColumnTypeName(int index)Returns the Data Engine data type name of the column at the specified index.booleanisComputedColumn(int index)Indicates whether the specified projected column is defined as a computed column.
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Method Detail
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getColumnCount
int getColumnCount()
Returns the number of columns in a row of the result set.- Returns:
- the number of columns in a row.
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getColumnName
java.lang.String getColumnName(int index) throws ScriptExceptionReturns the column name at the specified index.- Parameters:
index- The projected column index.- Returns:
- The name of the specified column.
- Throws:
ScriptException- if given index is invalid.
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getColumnAlias
java.lang.String getColumnAlias(int index) throws ScriptExceptionReturns the column alias at the specified index. An alias is given to a column as a programmatic convenience. A column can be referred using a name or an alias interchangeably.- Parameters:
index- The projected column index.- Returns:
- The alias of the specified column. Null if none is defined.
- Throws:
ScriptException- if given index is invalid.
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getColumnType
int getColumnType(int index) throws ScriptExceptionReturns the data type of the column at the specified index.- Parameters:
index- The projected column index.- Returns:
- The data type of the specified column, as an integer defined in org.eclipse.birt.data.engine.api.DataType.
- Throws:
ScriptException- if given index is invalid.
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getColumnTypeName
java.lang.String getColumnTypeName(int index) throws ScriptExceptionReturns the Data Engine data type name of the column at the specified index.- Parameters:
index- The projected column index.- Returns:
- The Data Engine data type name of the specified column.
- Throws:
ScriptException- if given index is invalid.
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getColumnNativeTypeName
java.lang.String getColumnNativeTypeName(int index) throws ScriptExceptionReturns the data provider specific data type name of the specified column.- Returns:
- the data type name as defined by the data provider.
- Throws:
ScriptException- if given index is invalid.
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getColumnLabel
java.lang.String getColumnLabel(int index) throws ScriptExceptionGets the label or display name of the column at the specified index.- Parameters:
index- The projected column index.- Returns:
- The label of the specified column.
- Throws:
ScriptException- if given index is invalid.
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isComputedColumn
boolean isComputedColumn(int index) throws ScriptExceptionIndicates whether the specified projected column is defined as a computed column. A computed column is one that is not retrieved from the underlying data provider. Only those computed columns declared explicitly in a data set design are considered as "computed" columns.- Parameters:
index- The projected column index.- Returns:
- true if the given column is a computed column; false otherwise.
- Throws:
ScriptException- if given index is invalid.
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