# 所有程序包的分层结构

程序包分层结构:

- com.dolphindb.jdbc

## 类分层结构

- java.lang.Object
  - com.dolphindb.jdbc.ColumnBindValue (implements java.lang.Comparable<T>)
  - com.dolphindb.jdbc.Driver (implements java.sql.Driver)
  - com.dolphindb.jdbc.JDBCConnection (implements java.sql.Connection)
  - com.dolphindb.jdbc.JDBCDataBaseMetaData (implements java.sql.DatabaseMetaData)
  - com.dolphindb.jdbc.JDBCParameterMetaData (implements java.sql.ParameterMetaData)
  - com.dolphindb.jdbc.JDBCResultSet (implements java.sql.ResultSet)
  - com.dolphindb.jdbc.JDBCResultSetMetaData (implements java.sql.ResultSetMetaData)
  - com.dolphindb.jdbc.JDBCStatement (implements java.sql.Statement)
    - com.dolphindb.jdbc.JDBCPrepareStatement (implements java.sql.PreparedStatement)
      - com.dolphindb.jdbc.JDBCCallableStatement (implements java.sql.CallableStatement)
  - com.dolphindb.jdbc.Main
  - com.dolphindb.jdbc.TypeCast
  - com.dolphindb.jdbc.Utils

## 枚举分层结构

- java.lang.Object
  - java.lang.Enum<E> (implements java.lang.Comparable<T>, java.io.Serializable)
    - com.dolphindb.jdbc.InsertType