java.lang.Object
- mondrian.rolap.aggmatcher.JdbcSchema

```
public class JdbcSchema
extends Object
```
Metadata gleaned from JDBC about the tables and columns in the star schema. This class is used to scrape a database and store information about its tables and columnIter.
The structure of this information is as follows: A database has tables. A table has columnIter. A column has one or more usages. A usage might be a column being used as a foreign key or as part of a measure.
Tables are created when calling code requests the set of available tables. This call getTables() causes all tables to be loaded. But a table's columnIter are not loaded until, on a table-by-table basis, a request is made to get the set of columnIter associated with the table. Since, the AggTableManager first attempts table name matches (recognition) most tables do not match, so why load their columnIter. Of course, as a result, there are a host of methods that can throw an SQLException, rats.

Author:

Richard M. Emberson

Nested Class Summary

Nested Classes
Modifier and Type	Class	Description
`static interface`	`JdbcSchema.Factory`
`static class`	`JdbcSchema.StdFactory`
`class`	`JdbcSchema.Table`	A table in a database.
`static class`	`JdbcSchema.UsageType`	Enumeration of ways that an aggregate table can use a column.

Field Summary

Fields
Modifier and Type	Field	Description
`static String`	`FACT_COUNT_COLUMN_NAME`
`static int`	`FACT_COUNT_COLUMN_USAGE`
`static String`	`FOREIGN_KEY_COLUMN_NAME`
`static int`	`FOREIGN_KEY_COLUMN_USAGE`
`static String`	`IGNORE_COLUMN_NAME`
`static int`	`IGNORE_COLUMN_USAGE`
`static String`	`LEVEL_COLUMN_NAME`
`static int`	`LEVEL_COLUMN_USAGE`
`static String`	`MEASURE_COLUMN_NAME`
`static int`	`MEASURE_COLUMN_USAGE`
`static String`	`UNKNOWN_COLUMN_NAME`
`static int`	`UNKNOWN_COLUMN_USAGE`

Constructor Summary

Constructors
Constructor Description

JdbcSchema(DataSource dataSource)

Method Summary

All Methods Static Methods Instance Methods Concrete Methods Deprecated Methods
Modifier and Type	Method	Description
`protected void`	`addTable(ResultSet rs)`	Makes a Table from an ResultSet: the table's name is the ResultSet third entry.
`protected void`	`clear()`
`static void`	`clearAllDBs()`
`static void`	`clearDB(DataSource dataSource)`	Clears information in a JdbcSchema associated with a DataSource.
`static String`	`convertColumnTypeToName(Set<JdbcSchema.UsageType> columnType)`	Maps from column type enum to column type name or list of names if the parameter represents more than on usage.
`void`	`flushUsages()`	flushes all star usage references
`String`	`getCatalogName()`	Returns the database's catalog name.
`DataSource`	`getDataSource()`
`static Dialect.Datatype`	`getDatatype(int javaType)`	Converts a `Types` value to a `Dialect.Datatype`.
`org.apache.logging.log4j.Logger`	`getLogger()`	Returns the Logger.
`String`	`getSchemaName()`	Returns the database's schema name.
`JdbcSchema.Table`	`getTable(String tableName)`	Gets a table by name.
`Collection<JdbcSchema.Table>`	`getTables()`	Returns the database's tables.
`protected SortedMap<String,JdbcSchema.Table>`	`getTablesMap()`
`static boolean`	`isText(int javaType)`	Returns true if the parameter is a java.sql.Type text type.
`static boolean`	`isUniqueColumnType(Set<JdbcSchema.UsageType> columnType)`	Determine if the parameter represents a single column type, i.e., the column only has one usage.
`void`	`load()`	Deprecated. API updated to pass Mondrian connection properties See: `load(PropertyList)`
`void`	`load(Util.PropertyList connectInfo)`	This forces the tables to be loaded.
`protected void`	`loadTables(Util.PropertyList connectInfo)`	Gets all of the tables (and views) in the database.
`static JdbcSchema`	`makeDB(DataSource dataSource)`	Creates or retrieves an instance of the JdbcSchema for the given DataSource.
`void`	`print(PrintWriter pw, String prefix)`
`protected void`	`remove()`
`static void`	`removeDB(DataSource dataSource)`	Removes a JdbcSchema associated with a DataSource.
`void`	`setCatalogName(String catalog)`	Sets the database's catalog name.
`protected void`	`setDataSource(DataSource dataSource)`
`void`	`setSchemaName(String schema)`	Sets the database's schema name.
`String`	`toString()`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Field Detail
  - UNKNOWN_COLUMN_USAGE
```
public static final int UNKNOWN_COLUMN_USAGE
```
    See Also:
    
    Constant Field Values
  - FOREIGN_KEY_COLUMN_USAGE
```
public static final int FOREIGN_KEY_COLUMN_USAGE
```
    See Also:
    
    Constant Field Values
  - MEASURE_COLUMN_USAGE
```
public static final int MEASURE_COLUMN_USAGE
```
    See Also:
    
    Constant Field Values
  - LEVEL_COLUMN_USAGE
```
public static final int LEVEL_COLUMN_USAGE
```
    See Also:
    
    Constant Field Values
  - FACT_COUNT_COLUMN_USAGE
```
public static final int FACT_COUNT_COLUMN_USAGE
```
    See Also:
    
    Constant Field Values
  - IGNORE_COLUMN_USAGE
```
public static final int IGNORE_COLUMN_USAGE
```
    See Also:
    
    Constant Field Values
  - UNKNOWN_COLUMN_NAME
```
public static final String UNKNOWN_COLUMN_NAME
```
    See Also:
    
    Constant Field Values
  - FOREIGN_KEY_COLUMN_NAME
```
public static final String FOREIGN_KEY_COLUMN_NAME
```
    See Also:
    
    Constant Field Values
  - MEASURE_COLUMN_NAME
```
public static final String MEASURE_COLUMN_NAME
```
    See Also:
    
    Constant Field Values
  - LEVEL_COLUMN_NAME
```
public static final String LEVEL_COLUMN_NAME
```
    See Also:
    
    Constant Field Values
  - FACT_COUNT_COLUMN_NAME
```
public static final String FACT_COUNT_COLUMN_NAME
```
    See Also:
    
    Constant Field Values
  - IGNORE_COLUMN_NAME
```
public static final String IGNORE_COLUMN_NAME
```
    See Also:
    
    Constant Field Values
- Constructor Detail
  - JdbcSchema
```
public JdbcSchema(DataSource dataSource)
```
- Method Detail
  - getLogger
```
public org.apache.logging.log4j.Logger getLogger()
```
    Returns the Logger.
  - makeDB
```
public static JdbcSchema makeDB(DataSource dataSource)
```
    Creates or retrieves an instance of the JdbcSchema for the given DataSource.
    
    Parameters:
    
    dataSource - DataSource
    
    Returns:
    
    instance of the JdbcSchema for the given DataSource
  - clearDB
```
public static void clearDB(DataSource dataSource)
```
    Clears information in a JdbcSchema associated with a DataSource.
    
    Parameters:
    
    dataSource - DataSource
  - removeDB
```
public static void removeDB(DataSource dataSource)
```
    Removes a JdbcSchema associated with a DataSource.
    
    Parameters:
    
    dataSource - DataSource
  - isUniqueColumnType
```
public static boolean isUniqueColumnType(Set<JdbcSchema.UsageType> columnType)
```
    Determine if the parameter represents a single column type, i.e., the column only has one usage.
    
    Parameters:
    
    columnType - Column types
    
    Returns:
    
    true if column has only one usage.
  - convertColumnTypeToName
```
public static String convertColumnTypeToName(Set<JdbcSchema.UsageType> columnType)
```
    Maps from column type enum to column type name or list of names if the parameter represents more than on usage.
  - getDatatype
```
public static Dialect.Datatype getDatatype(int javaType)
```
    Converts a Types value to a Dialect.Datatype.
    
    Parameters:
    
    javaType - JDBC type code, as per Types
    
    Returns:
    
    Datatype
  - isText
```
public static boolean isText(int javaType)
```
    Returns true if the parameter is a java.sql.Type text type.
  - load
```
@Deprecated
public void load()
          throws SQLException
```
    Deprecated.
    API updated to pass Mondrian connection properties See: load(PropertyList)
    
    Throws:
    
    SQLException
  - load
```
public void load(Util.PropertyList connectInfo)
          throws SQLException
```
    This forces the tables to be loaded.
    
    Parameters:
    
    connectInfo - Mondrian connection properties
    
    Throws:
    
    SQLException
  - clear
```
protected void clear()
```
  - remove
```
protected void remove()
```
  - getDataSource
```
public DataSource getDataSource()
```
  - setDataSource
```
protected void setDataSource(DataSource dataSource)
```
  - setSchemaName
```
public void setSchemaName(String schema)
```
    Sets the database's schema name.
    
    Parameters:
    
    schema - Schema name
  - getSchemaName
```
public String getSchemaName()
```
    Returns the database's schema name.
  - setCatalogName
```
public void setCatalogName(String catalog)
```
    Sets the database's catalog name.
  - getCatalogName
```
public String getCatalogName()
```
    Returns the database's catalog name.
  - getTables
```
public Collection<JdbcSchema.Table> getTables()
```
    Returns the database's tables. The collection is sorted by table name.
  - flushUsages
```
public void flushUsages()
```
    flushes all star usage references
  - getTable
```
public JdbcSchema.Table getTable(String tableName)
```
    Gets a table by name.
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object
  - print
```
public void print(PrintWriter pw,
                  String prefix)
```
  - loadTables
```
protected void loadTables(Util.PropertyList connectInfo)
                   throws SQLException
```
    Gets all of the tables (and views) in the database. If called a second time, this method is a no-op.
    
    Parameters:
    
    connectInfo - The Mondrian connection properties
    
    Throws:
    
    SQLException
  - addTable
```
protected void addTable(ResultSet rs)
                 throws SQLException
```
    Makes a Table from an ResultSet: the table's name is the ResultSet third entry.
    
    Parameters:
    
    rs - Result set
    
    Throws:
    
    SQLException
  - getTablesMap
```
protected SortedMap<String,JdbcSchema.Table> getTablesMap()
```
  - clearAllDBs
```
public static void clearAllDBs()
```

Class JdbcSchema

Nested Class Summary

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

UNKNOWN_COLUMN_USAGE

FOREIGN_KEY_COLUMN_USAGE

MEASURE_COLUMN_USAGE

LEVEL_COLUMN_USAGE

FACT_COUNT_COLUMN_USAGE

IGNORE_COLUMN_USAGE

UNKNOWN_COLUMN_NAME

FOREIGN_KEY_COLUMN_NAME

MEASURE_COLUMN_NAME

LEVEL_COLUMN_NAME

FACT_COUNT_COLUMN_NAME

IGNORE_COLUMN_NAME

Constructor Detail

JdbcSchema

Method Detail

getLogger

makeDB

clearDB

removeDB

isUniqueColumnType

convertColumnTypeToName

getDatatype

isText

load

load

clear

remove

getDataSource

setDataSource

setSchemaName

getSchemaName

setCatalogName

getCatalogName

getTables

flushUsages

getTable

toString

print

loadTables

addTable

getTablesMap

clearAllDBs