Package org.aoju.bus.shade.screw.dialect

Class AbstractDatabaseQuery

java.lang.Object

org.aoju.bus.shade.screw.dialect.AbstractDatabaseQuery

All Implemented Interfaces:

DatabaseQuery

Direct Known Subclasses:

CacheDbDataBaseQuery, Db2DataBaseQuery, H2DataBaseQuery, MariaDbDataBaseQuery, MySqlDataBaseQuery, OracleDataBaseQuery, OtherDataBaseQuery, PostgreSqlDataBaseQuery, SqlServerDataBaseQuery

public abstract class AbstractDatabaseQuery
extends Object
implements DatabaseQuery

抽象查询

Since:

Java 17+

Author:

Kimi Liu

Field Summary

Fields

Modifier and Type	Field	Description
protected final Map<String,List<Column>>	columnsCaching	缓存
protected Connection	connection	Connection 双重锁，线程安全

Constructor Summary

Constructors

Constructor	Description
AbstractDatabaseQuery(DataSource dataSource)

Method Summary

Modifier and Type	Method	Description
static void	close(Connection conn)	释放资源
static void	close(ResultSet rs)	释放资源
static void	close(ResultSet rs, Connection conn)	释放资源
static void	close(ResultSet rs, Statement st, Connection conn)	释放资源
protected String	getCatalog()	获取 getCatalog
protected DatabaseMetaData	getMetaData()	获取 DatabaseMetaData
List<? extends PrimaryKey>	getPrimaryKeys()	根据表名获取主键
protected String	getSchema()	获取 getSchema
protected PreparedStatement	prepareStatement(String sql)	准备声明

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.aoju.bus.shade.screw.dialect.DatabaseQuery

getDataBase, getPrimaryKeys, getTableColumns, getTableColumns, getTables

Field Details

columnsCaching

protected final Map<String,List<Column>> columnsCaching

缓存

connection

protected volatile Connection connection

Connection 双重锁，线程安全

Constructor Details

AbstractDatabaseQuery

public AbstractDatabaseQuery(DataSource dataSource)

Method Details

close

public static void close(ResultSet rs)

释放资源

Parameters:

rs - ResultSet

close

public static void close(Connection conn)

释放资源

Parameters:

conn - Connection

close

public static void close(ResultSet rs,
 Connection conn)

释放资源

Parameters:

rs - ResultSet

conn - Connection

close

public static void close(ResultSet rs,
 Statement st,
 Connection conn)

释放资源

Parameters:

rs - ResultSet

st - Statement

conn - Connection

getCatalog

protected String getCatalog()
                     throws org.aoju.bus.core.exception.InstrumentException

获取 getCatalog

Returns:

String

Throws:

org.aoju.bus.core.exception.InstrumentException - 异常

getSchema

protected String getSchema()
                    throws org.aoju.bus.core.exception.InstrumentException

获取 getSchema

Returns:

String

Throws:

org.aoju.bus.core.exception.InstrumentException - 异常

getMetaData

protected DatabaseMetaData getMetaData()
                                throws org.aoju.bus.core.exception.InstrumentException

获取 DatabaseMetaData

Returns:

DatabaseMetaData

Throws:

org.aoju.bus.core.exception.InstrumentException - 异常

prepareStatement

protected PreparedStatement prepareStatement(String sql)
                                      throws org.aoju.bus.core.exception.InstrumentException

准备声明

Parameters:

sql - String SQL

Returns:

PreparedStatement

Throws:

org.aoju.bus.core.exception.InstrumentException - 异常

getPrimaryKeys

public List<? extends PrimaryKey> getPrimaryKeys()
                                          throws org.aoju.bus.core.exception.InstrumentException

根据表名获取主键

Specified by:

getPrimaryKeys in interface DatabaseQuery

Returns:

List

Throws:

org.aoju.bus.core.exception.InstrumentException - 异常