DatabaseMetaData Java

package com.database.manager;

import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;

/**
 * @author daoger
 *
 * 2009-9-24
 */
public class DatabaseMetaDateApplication
{
 private DatabaseMetaData dbMetaData = null;

 private Connection con = null;

 private void getDatabaseMetaData()
 {
  try
  {
   if (dbMetaData == null)
   {
    Class.forName("oracle.jdbc.driver.OracleDriver");
    String url = "jdbc:oracle:thin:@192.168.0.2:1521:×××";
    String user = "×××";
    String password = "×××";
    con = DriverManager.getConnection(url, user, password);
    dbMetaData = con.getMetaData();
   }
  } catch (ClassNotFoundException e)
  {
   // TODO: handle ClassNotFoundException
   e.printStackTrace();
  } catch (SQLException e)
  {
   // TODO: handle SQLException
   e.printStackTrace();
  }
 }

 public void colseCon()
 {
  try
  {
   if (con != null)
   {
    con.close();
   }
  } catch (SQLException e)
  {
   // TODO: handle SQLException
   e.printStackTrace();
  }
 }

 /**
  * 获得数据库的一些相关信息
  */
 public void getDataBaseInformations()
 {
  try
  {
   System.out.println("URL:" + dbMetaData.getURL() + ";");
   System.out.println("UserName:" + dbMetaData.getUserName() + ";");
   System.out.println("isReadOnly:" + dbMetaData.isReadOnly() + ";");
   System.out.println("DatabaseProductName:" + dbMetaData.getDatabaseProductName() + ";");
   System.out.println("DatabaseProductVersion:" + dbMetaData.getDatabaseProductVersion() + ";");
   System.out.println("DriverName:" + dbMetaData.getDriverName() + ";");
   System.out.println("DriverVersion:" + dbMetaData.getDriverVersion());
  } catch (SQLException e)
  {
   // TODO: handle SQLException
   e.printStackTrace();
  }
 }

 /**
  * 获得该用户下面的所有表
  */
 public void getAllTableList(String schemaName)
 {
  try
  {
   // table type. Typical types are "TABLE", "VIEW", "SYSTEM
   // TABLE", "GLOBAL TEMPORARY", "LOCAL TEMPORARY", "ALIAS",
   // "SYNONYM".
   String[] types =
   { "TABLE" };
   ResultSet rs = dbMetaData.getTables(null, schemaName, "%", types);
   while (rs.next())
   {
    String tableName = rs.getString("TABLE_NAME");
    // table type. Typical types are "TABLE", "VIEW", "SYSTEM
    // TABLE", "GLOBAL TEMPORARY", "LOCAL TEMPORARY", "ALIAS",
    // "SYNONYM".
    String tableType = rs.getString("TABLE_TYPE");
    // explanatory comment on the table
    String remarks = rs.getString("REMARKS");
    System.out.println(tableName + "-" + tableType + "-" + remarks);
   }
  } catch (SQLException e)
  {
   // TODO: handle SQLException
   e.printStackTrace();
  }
 }

 /**
  * 获得该用户下面的所有视图
  */
 public void getAllViewList(String schemaName)
 {
  try
  {
   String[] types =
   { "VIEW" };
   ResultSet rs = dbMetaData.getTables(null, schemaName, "%", types);
   while (rs.next())
   {
    String viewName = rs.getString("TABLE_NAME");
    // table type. Typical types are "TABLE", "VIEW", "SYSTEM
    // TABLE", "GLOBAL TEMPORARY", "LOCAL TEMPORARY", "ALIAS",
    // "SYNONYM".
    String viewType = rs.getString("TABLE_TYPE");
    // explanatory comment on the table
    String remarks = rs.getString("REMARKS");
    System.out.println(viewName + "-" + viewType + "-" + remarks);
   }
  } catch (SQLException e)
  {
   // TODO: handle SQLException
   e.printStackTrace();
  }
 }

 /**
  * 获得数据库中所有方案名称
  */
 public void getAllSchemas()
 {
  try
  {
   ResultSet rs = dbMetaData.getSchemas();
   while (rs.next())
   {
    String tableSchem = rs.getString("TABLE_SCHEM");
    System.out.println(tableSchem);
   }
  } catch (SQLException e)
  {
   // TODO: handle SQLException
   e.printStackTrace();
  }
 }

 /**
  * 获得表或视图中的所有列信息
  */
 public void getTableColumns(String schemaName, String tableName)
 {
  try
  {
   ResultSet rs = dbMetaData.getColumns(null, schemaName, tableName, "%");
   while (rs.next())
   {
    // table catalog (may be null)
    String tableCat = rs.getString("TABLE_CAT");
    // table schema (may be null)
    String tableSchemaName = rs.getString("TABLE_SCHEM");
    // table name
    String tableName_ = rs.getString("TABLE_NAME");
    // column name
    String columnName = rs.getString("COLUMN_NAME");
    // SQL type from java.sql.Types
    int dataType = rs.getInt("DATA_TYPE");
    // Data source dependent type name, for a UDT the type name is
    // fully qualified
    String dataTypeName = rs.getString("TYPE_NAME");
    // table schema (may be null)
    int columnSize = rs.getInt("COLUMN_SIZE");
    // the number of fractional digits. Null is returned for data
    // types where DECIMAL_DIGITS is not applicable.
    int decimalDigits = rs.getInt("DECIMAL_DIGITS");
    // Radix (typically either 10 or 2)
    int numPrecRadix = rs.getInt("NUM_PREC_RADIX");
    // is NULL allowed.
    int nullAble = rs.getInt("NULLABLE");
    // comment describing column (may be null)
    String remarks = rs.getString("REMARKS");
    // default value for the column, which should be interpreted as
    // a string when the value is enclosed in single quotes (may be
    // null)
    String columnDef = rs.getString("COLUMN_DEF");
    //    
    int sqlDataType = rs.getInt("SQL_DATA_TYPE");
    //    
    int sqlDatetimeSub = rs.getInt("SQL_DATETIME_SUB");
    // for char types the maximum number of bytes in the column
    int charOctetLength = rs.getInt("CHAR_OCTET_LENGTH");
    // index of column in table (starting at 1)
    int ordinalPosition = rs.getInt("ORDINAL_POSITION");
    // ISO rules are used to determine the nullability for a column.
    // YES --- if the parameter can include NULLs;
    // NO --- if the parameter cannot include NULLs
    // empty string --- if the nullability for the parameter is
    // unknown
    String isNullAble = rs.getString("IS_NULLABLE");
    // Indicates whether this column is auto incremented
    // YES --- if the column is auto incremented
    // NO --- if the column is not auto incremented
    // empty string --- if it cannot be determined whether the
    // column is auto incremented parameter is unknown
    String isAutoincrement = rs.getString("IS_AUTOINCREMENT");
    System.out.println(tableCat + "-" + tableSchemaName + "-" + tableName_ + "-" + columnName + "-"
      + dataType + "-" + dataTypeName + "-" + columnSize + "-" + decimalDigits + "-" + numPrecRadix
      + "-" + nullAble + "-" + remarks + "-" + columnDef + "-" + sqlDataType + "-" + sqlDatetimeSub
      + charOctetLength + "-" + ordinalPosition + "-" + isNullAble + "-" + isAutoincrement + "-");
   }
  } catch (SQLException e)
  {
   // TODO: handle SQLException
   e.printStackTrace();
  }
 }

 /**
  * 获得一个表的索引信息
  */
 public void getIndexInfo(String schemaName, String tableName)
 {
  try
  {
   ResultSet rs = dbMetaData.getIndexInfo(null, schemaName, tableName, true, true);
   while (rs.next())
   {
    // Can index values be non-unique. false when TYPE is
    // tableIndexStatistic
    boolean nonUnique = rs.getBoolean("NON_UNIQUE");
    // index catalog (may be null); null when TYPE is
    // tableIndexStatistic
    String indexQualifier = rs.getString("INDEX_QUALIFIER");
    // index name; null when TYPE is tableIndexStatistic
    String indexName = rs.getString("INDEX_NAME");
    // index type:
    // tableIndexStatistic - this identifies table statistics that
    // are returned in conjuction with a table's index descriptions
    // tableIndexClustered - this is a clustered index
    // tableIndexHashed - this is a hashed index
    // tableIndexOther - this is some other style of index
    short type = rs.getShort("TYPE");
    // column sequence number within index; zero when TYPE is
    // tableIndexStatistic
    short ordinalPosition = rs.getShort("ORDINAL_POSITION");
    // column name; null when TYPE is tableIndexStatistic
    String columnName = rs.getString("COLUMN_NAME");
    // column sort sequence, "A" => ascending, "D" => descending,
    // may be null if sort sequence is not supported; null when TYPE
    // is tableIndexStatistic
    String ascOrDesc = rs.getString("ASC_OR_DESC");
    // When TYPE is tableIndexStatistic, then this is the number of
    // rows in the table; otherwise, it is the number of unique
    // values in the index.
    int cardinality = rs.getInt("CARDINALITY");
    System.out.println(nonUnique + "-" + indexQualifier + "-" + indexName + "-" + type + "-"
      + ordinalPosition + "-" + columnName + "-" + ascOrDesc + "-" + cardinality);
   }
  } catch (SQLException e)
  {
   // TODO: handle SQLException
   e.printStackTrace();
  }
 }

 /**
  * 获得一个表的主键信息
  */
 public void getAllPrimaryKeys(String schemaName, String tableName)
 {
  try
  {
   ResultSet rs = dbMetaData.getPrimaryKeys(null, schemaName, tableName);
   while (rs.next())
   {
    // column name
    String columnName = rs.getString("COLUMN_NAME");
    // sequence number within primary key( a value of 1 represents
    // the first column of the primary key, a value of 2 would
    // represent the second column within the primary key).
    short keySeq = rs.getShort("KEY_SEQ");
    // primary key name (may be null)
    String pkName = rs.getString("PK_NAME");
    System.out.println(columnName + "-" + keySeq + "-" + pkName);
   }
  } catch (SQLException e)
  {
   // TODO: handle SQLException
   e.printStackTrace();
  }
 }

 /**
  * 获得一个表的外键信息
  */
 public void getAllExportedKeys(String schemaName, String tableName)
 {
  try
  {
   ResultSet rs = dbMetaData.getExportedKeys(null, schemaName, tableName);
   while (rs.next())
   {
    // primary key table catalog (may be null)
    String pkTableCat = rs.getString("PKTABLE_CAT");
    // primary key table schema (may be null)
    String pkTableSchem = rs.getString("PKTABLE_SCHEM");
    // primary key table name
    String pkTableName = rs.getString("PKTABLE_NAME");
    // primary key column name
    String pkColumnName = rs.getString("PKCOLUMN_NAME");
    // foreign key table catalog (may be null) being exported (may
    // be null)
    String fkTableCat = rs.getString("FKTABLE_CAT");
    // foreign key table schema (may be null) being exported (may be
    // null)
    String fkTableSchem = rs.getString("FKTABLE_SCHEM");
    // foreign key table name being exported
    String fkTableName = rs.getString("FKTABLE_NAME");
    // foreign key column name being exported
    String fkColumnName = rs.getString("FKCOLUMN_NAME");
    // sequence number within foreign key( a value of 1 represents
    // the first column of the foreign key, a value of 2 would
    // represent the second column within the foreign key).
    short keySeq = rs.getShort("KEY_SEQ");
    // What happens to foreign key when primary is updated:
    // importedNoAction - do not allow update of primary key if it
    // has been imported
    // importedKeyCascade - change imported key to agree with
    // primary key update
    // importedKeySetNull - change imported key to NULL if its
    // primary key has been updated
    // importedKeySetDefault - change imported key to default values
    // if its primary key has been updated
    // importedKeyRestrict - same as importedKeyNoAction (for ODBC
    // 2.x compatibility)
    short updateRule = rs.getShort("UPDATE_RULE");

    // What happens to the foreign key when primary is deleted.
    // importedKeyNoAction - do not allow delete of primary key if
    // it has been imported
    // importedKeyCascade - delete rows that import a deleted key
    // importedKeySetNull - change imported key to NULL if its
    // primary key has been deleted
    // importedKeyRestrict - same as importedKeyNoAction (for ODBC
    // 2.x compatibility)
    // importedKeySetDefault - change imported key to default if its
    // primary key has been deleted
    short delRule = rs.getShort("DELETE_RULE");
    // foreign key name (may be null)
    String fkName = rs.getString("FK_NAME");
    // primary key name (may be null)
    String pkName = rs.getString("PK_NAME");
    // can the evaluation of foreign key constraints be deferred
    // until commit
    // importedKeyInitiallyDeferred - see SQL92 for definition
    // importedKeyInitiallyImmediate - see SQL92 for definition
    // importedKeyNotDeferrable - see SQL92 for definition
    short deferRability = rs.getShort("DEFERRABILITY");
    System.out.println(pkTableCat + "-" + pkTableSchem + "-" + pkTableName + "-" + pkColumnName + "-"
      + fkTableCat + "-" + fkTableSchem + "-" + fkTableName + "-" + fkColumnName + "-" + keySeq + "-"
      + updateRule + "-" + delRule + "-" + fkName + "-" + pkName + "-" + deferRability);
   }
  } catch (SQLException e)
  {
   // TODO: handle SQLException
   e.printStackTrace();
  }
 }

 public DatabaseMetaDateApplication()
 {
  this.getDatabaseMetaData();
 }
}