Help Center/ GaussDB(DWS)/ Developer Guide/ Standard data warehouse (8.3.0.x)/ Using JDBC or ODBC for GaussDB(DWS) Secondary Development/ JDBC-Based Development/ JDBC Interfaces
Updated on 2024-11-05 GMT+08:00
View PDF
Share

JDBC Interfaces

JDBC interface is a set of API methods for users. This section describes some common interfaces. For other interfaces, see information in JDK1.6 (software package) and JDBC 4.0.

java.sql.Connection

This section describes java.sql.Connection, the interface for connecting to a database.

Table 1 java.sql.Connection methods

Method

Return Type

Support JDBC 4 or Not

close()

void

Yes

commit()

void

Yes

createStatement()

Statement

Yes

getAutoCommit()

boolean

Yes

getClientInfo()

Properties

Yes

getClientInfo(String name)

String

Yes

getTransactionIsolation()

int

Yes

isClosed()

boolean

Yes

isReadOnly()

boolean

Yes

prepareStatement(String sql)

PreparedStatement

Yes

rollback()

void

Yes

setAutoCommit(boolean autoCommit)

void

Yes

setClientInfo(Properties properties)

void

Yes

setClientInfo(String name,String value)

void

Yes

The interface uses the AutoCommit mode by default, but you can disable it by setting setAutoCommit to false. This will package all subsequent statements in explicit transactions. Note that you will not be able to execute statements that cannot be executed within transactions.

java.sql.CallableStatement

This section describes java.sql.CallableStatement, the stored procedure execution interface.

Table 2 java.sql.CallableStatement methods

Method

Return Type

Support JDBC 4 or Not

registerOutParameter(int parameterIndex, int type)

void

Yes

wasNull()

boolean

Yes

getString(int parameterIndex)

String

Yes

getBoolean(int parameterIndex)

boolean

Yes

getByte(int parameterIndex)

byte

Yes

getShort(int parameterIndex)

short

Yes

getInt(int parameterIndex)

int

Yes

getLong(int parameterIndex)

long

Yes

getFloat(int parameterIndex)

float

Yes

getDouble(int parameterIndex)

double

Yes

getBigDecimal(int parameterIndex)

BigDecimal

Yes

getBytes(int parameterIndex)

byte[]

Yes

getDate(int parameterIndex)

Date

Yes

getTime(int parameterIndex)

Time

Yes

getTimestamp(int parameterIndex)

Timestamp

Yes

getObject(int parameterIndex)

Object

Yes
  • Do not perform batch operations on statements containing OUT parameters.
  • The following methods are inherited from java.sql.Statement: close, execute, executeQuery, executeUpdate, getConnection, getResultSet, getUpdateCount, isClosed, setMaxRows, and setFetchSize.
  • The following methods are inherited from java.sql.PreparedStatement: addBatch, clearParameters, execute, executeQuery, executeUpdate, getMetaData, setBigDecimal, setBoolean, setByte, setBytes, setDate, setDouble, setFloat, setInt, setLong, setNull, setObject, setString, setTime, and setTimestamp.

java.sql.DatabaseMetaData

This section describes java.sql.DatabaseMetaData, the interface for defining database objects.

Table 3 java.sql.DatabaseMetaData methods

Method

Return Type

Support JDBC 4 or Not

getTables(String catalog, String schemaPattern, String tableNamePattern, String[] types)

ResultSet

Yes

getColumns(String catalog, String schemaPattern, String tableNamePattern, String columnNamePattern)

ResultSet

Yes

getTableTypes()

ResultSet

Yes

getUserName()

String

Yes

isReadOnly()

boolean

Yes

nullsAreSortedHigh()

boolean

Yes

nullsAreSortedLow()

boolean

Yes

nullsAreSortedAtStart()

boolean

Yes

nullsAreSortedAtEnd()

boolean

Yes

getDatabaseProductName()

String

Yes

getDatabaseProductVersion()

String

Yes

getDriverName()

String

Yes

getDriverVersion()

String

Yes

getDriverMajorVersion()

int

Yes

getDriverMinorVersion()

int

Yes

usesLocalFiles()

boolean

Yes

usesLocalFilePerTable()

boolean

Yes

supportsMixedCaseIdentifiers()

boolean

Yes

storesUpperCaseIdentifiers()

boolean

Yes

storesLowerCaseIdentifiers()

boolean

Yes

supportsMixedCaseQuotedIdentifiers()

boolean

Yes

storesUpperCaseQuotedIdentifiers()

boolean

Yes

storesLowerCaseQuotedIdentifiers()

boolean

Yes

storesMixedCaseQuotedIdentifiers()

boolean

Yes

supportsAlterTableWithAddColumn()

boolean

Yes

supportsAlterTableWithDropColumn()

boolean

Yes

supportsColumnAliasing()

boolean

Yes

nullPlusNonNullIsNull()

boolean

Yes

supportsConvert()

boolean

Yes

supportsConvert(int fromType, int toType)

boolean

Yes

supportsTableCorrelationNames()

boolean

Yes

supportsDifferentTableCorrelationNames()

boolean

Yes

supportsExpressionsInOrderBy()

boolean

Yes

supportsOrderByUnrelated()

boolean

Yes

supportsGroupBy()

boolean

Yes

supportsGroupByUnrelated()

boolean

Yes

supportsGroupByBeyondSelect()

boolean

Yes

supportsLikeEscapeClause()

boolean

Yes

supportsMultipleResultSets()

boolean

Yes

supportsMultipleTransactions()

boolean

Yes

supportsNonNullableColumns()

boolean

Yes

supportsMinimumSQLGrammar()

boolean

Yes

supportsCoreSQLGrammar()

boolean

Yes

supportsExtendedSQLGrammar()

boolean

Yes

supportsANSI92EntryLevelSQL()

boolean

Yes

supportsANSI92IntermediateSQL()

boolean

Yes

supportsANSI92FullSQL()

boolean

Yes

supportsIntegrityEnhancementFacility()

boolean

Yes

supportsOuterJoins()

boolean

Yes

supportsFullOuterJoins()

boolean

Yes

supportsLimitedOuterJoins()

boolean

Yes

isCatalogAtStart()

boolean

Yes

supportsSchemasInDataManipulation()

boolean

Yes

supportsSavepoints()

boolean

Yes

supportsResultSetHoldability(int holdability)

boolean

Yes

getResultSetHoldability()

int

Yes

getDatabaseMajorVersion()

int

Yes

getDatabaseMinorVersion()

int

Yes

getJDBCMajorVersion()

int

Yes

getJDBCMinorVersion()

int

Yes

java.sql.Driver

This section describes java.sql.Driver, the database driver interface.

Table 4 java.sql.Driver methods

Method

Return Type

Support JDBC 4 or Not

acceptsURL(String url)

boolean

Yes

connect(String url, Properties info)

Connection

Yes

jdbcCompliant()

boolean

Yes

getMajorVersion()

int

Yes

getMinorVersion()

int

Yes

java.sql.PreparedStatement

This section describes java.sql.PreparedStatement, the interface for preparing statements.

Table 5 java.sql.PreparedStatement methods

Method

Return Type

Support JDBC 4 or Not

clearParameters()

void

Yes

execute()

boolean

Yes

executeQuery()

ResultSet

Yes

executeUpdate()

int

Yes

getMetaData()

ResultSetMetaData

Yes

setBoolean(int parameterIndex, boolean x)

void

Yes

setBigDecimal(int parameterIndex, BigDecimal x)

void

Yes

setByte(int parameterIndex, byte x)

void

Yes

setBytes(int parameterIndex, byte[] x)

void

Yes

setDate(int parameterIndex, Date x)

void

Yes

setDouble(int parameterIndex, double x)

void

Yes

setFloat(int parameterIndex, float x)

void

Yes

setInt(int parameterIndex, int x)

void

Yes

setLong(int parameterIndex, long x)

void

Yes

setNString(int parameterIndex, String value)

void

Yes

setShort(int parameterIndex, short x)

void

Yes

setString(int parameterIndex, String x)

void

Yes

addBatch()

void

Yes

executeBatch()

int[]

Yes

clearBatch()

void

Yes
  • addBatch() and execute() can be executed only after clearBatch().
  • Calling the executeBatch() method does not clear the batch. Clear batch by explicitly calling clearBatch().
  • You do not need to use set*() to reuse the values of bounded variables in a batch after they have been added.
  • The following methods are inherited from java.sql.Statement: close, execute, executeQuery, executeUpdate, getConnection, getResultSet, getUpdateCount, isClosed, setMaxRows, and setFetchSize.

java.sql.ResultSet

This section describes java.sql.ResultSet, the interface for execution result sets.

Table 6 java.sql.ResultSet methods

Method

Return Type

Support JDBC 4 or Not

findColumn(String columnLabel)

int

Yes

getBigDecimal(int columnIndex)

BigDecimal

Yes

getBigDecimal(String columnLabel)

BigDecimal

Yes

getBoolean(int columnIndex)

boolean

Yes

getBoolean(String columnLabel)

boolean

Yes

getByte(int columnIndex)

byte

Yes

getBytes(int columnIndex)

byte[]

Yes

getByte(String columnLabel)

byte

Yes

getBytes(String columnLabel)

byte[]

Yes

getDate(int columnIndex)

Date

Yes

getDate(String columnLabel)

Date

Yes

getDouble(int columnIndex)

double

Yes

getDouble(String columnLabel)

double

Yes

getFloat(int columnIndex)

float

Yes

getFloat(String columnLabel)

float

Yes

getInt(int columnIndex)

int

Yes

getInt(String columnLabel)

int

Yes

getLong(int columnIndex)

long

Yes

getLong(String columnLabel)

long

Yes

getShort(int columnIndex)

short

Yes

getShort(String columnLabel)

short

Yes

getString(int columnIndex)

String

Yes

getString(String columnLabel)

String

Yes

getTime(int columnIndex)

Time

Yes

getTime(String columnLabel)

Time

Yes

getTimestamp(int columnIndex)

Timestamp

Yes

getTimestamp(String columnLabel)

Timestamp

Yes

isAfterLast()

boolean

Yes

isBeforeFirst()

boolean

Yes

isFirst()

boolean

Yes

next()

boolean

Yes
  • A statement cannot have multiple open result sets.
  • The cursor used to traverse the result set cannot remain in the open state after being committed.

java.sql.ResultSetMetaData

This section describes java.sql.ResultSetMetaData, which provides details about ResultSet object information.

Table 7 java.sql.ResultSetMetaData methods

Method

Return Type

Support JDBC 4 or Not

getColumnCount()

int

Yes

getColumnName(int column)

String

Yes

getColumnType(int column)

int

Yes

getColumnTypeName(int column)

String

Yes

java.sql.Statement

This section describes java.sql.Statement, the interface for executing SQL statements.

Table 8 java.sql.Statement methods

Method

Return Type

Support JDBC 4 or Not

close()

void

Yes

execute(String sql)

boolean

Yes

executeQuery(String sql)

ResultSet

Yes

executeUpdate(String sql)

int

Yes

getConnection()

Connection

Yes

getResultSet()

ResultSet

Yes

getQueryTimeout()

int

Yes

getUpdateCount()

int

Yes

isClosed()

boolean

Yes

setQueryTimeout(int seconds)

void

Yes

setFetchSize(int rows)

void

Yes

cancel()

void

Yes

setFetchSize can reduce the memory occupied by the result set on the client. Result sets are packaged into cursors and segmented for processing, which will increase the communication traffic between the database and the client, affecting performance.

Database cursors are valid only within their transactions. Therefore, when setting setFetchSize, set setAutoCommit to false and commit transactions on the connection to flush service data to a database.

javax.sql.ConnectionPoolDataSource

This section describes javax.sql.ConnectionPoolDataSource, the interface for data source connection pools.

Table 9 javax.sql.ConnectionPoolDataSource methods

Method

Return Type

Support JDBC 4 or Not

getLoginTimeout()

int

Yes

getLogWriter()

PrintWriter

Yes

getPooledConnection()

PooledConnection

Yes

getPooledConnection(String user,String password)

PooledConnection

Yes

setLoginTimeout(int seconds)

void

Yes

setLogWriter(PrintWriter out)

void

Yes

javax.sql.DataSource

This section describes javax.sql.DataSource, the interface for data sources.

Table 10 javax.sql.DataSource methods

Method

Return Type

Support JDBC 4 or Not

getConnection()

Connection

Yes

getConnection(String username,String password)

Connection

Yes

getLoginTimeout()

int

Yes

getLogWriter()

PrintWriter

Yes

setLoginTimeout(int seconds)

void

Yes

setLogWriter(PrintWriter out)

void

Yes

javax.sql.PooledConnection

This section describes javax.sql.PooledConnection, the connection interface created by a connection pool.

Table 11 javax.sql.PooledConnection methods

Method

Return Type

Support JDBC 4 or Not

addConnectionEventListener (ConnectionEventListener listener)

void

Yes

close()

void

Yes

getConnection()

Connection

Yes

removeConnectionEventListener (ConnectionEventListener listener)

void

Yes

addStatementEventListener (StatementEventListener listener)

void

Yes

removeStatementEventListener (StatementEventListener listener)

void

Yes

javax.naming.Context

This section describes javax.naming.Context, the context interface for connection configuration.

Table 12 javax.naming.Context methods

Method

Return Type

Support JDBC 4 or Not

bind(Name name, Object obj)

void

Yes

bind(String name, Object obj)

void

Yes

lookup(Name name)

Object

Yes

lookup(String name)

Object

Yes

rebind(Name name, Object obj)

void

Yes

rebind(String name, Object obj)

void

Yes

rename(Name oldName, Name newName)

void

Yes

rename(String oldName, String newName)

void

Yes

unbind(Name name)

void

Yes

unbind(String name)

void

Yes

javax.naming.spi.InitialContextFactory

This section describes javax.naming.spi.InitialContextFactory, the initial context factory interface.

Table 13 javax.naming.spi.InitialContextFactory methods

Method

Return Type

Support JDBC 4 or Not

getInitialContext(Hashtable<?,?> environment)

Context

Yes

CopyManager

CopyManager is an API interface class provided by the JDBC driver in GaussDB(DWS). It is used to import data to GaussDB(DWS) in batches.

Inheritance relationship of CopyManager

The CopyManager class is in the org.postgresql.copy package class and inherits the java.lang.Object class. The declaration of the class is as follows:

public class CopyManager
extends Object

Construction method

public CopyManager(BaseConnection connection)
throws SQLException

Common methods

Table 14 Common methods of CopyManager

Returned Value

Method

Description

throws

CopyIn

copyIn(String sql)

-

SQLException

long

copyIn(String sql, InputStream from)

Uses COPY FROM STDIN to quickly load data to tables in the database from InputStream.

SQLException,IOException

long

copyIn(String sql, InputStream from, int bufferSize)

Uses COPY FROM STDIN to quickly load data to tables in the database from InputStream.

SQLException,IOException

long

copyIn(String sql, Reader from)

Uses COPY FROM STDIN to quickly load data to tables in the database from Reader.

SQLException,IOException

long

copyIn(String sql, Reader from, int bufferSize)

Uses COPY FROM STDIN to quickly load data to tables in the database from Reader.

SQLException,IOException

CopyOut

copyOut(String sql)

-

SQLException

long

copyOut(String sql, OutputStream to)

Sends the result set of COPY TO STDOUT from the database to the OutputStream class.

SQLException,IOException

long

copyOut(String sql, Writer to)

Sends the result set of COPY TO STDOUT from the database to the Writer class.

SQLException,IOException
Parent topic: JDBC-Based Development