JAVA下的OracleHelper包
在.NET平臺下有個被使用的很廣泛的SqlHelper工具類,是微軟專門針對SQL Server數據庫所編寫的數據訪問層中間件,很好的對ADO.NET進行了封裝。在實際應用中,由於項目需求,當時我曾對SqlHelper進行了若干改造,變成了能夠針對Oracle數據庫進行訪問的OracleHelper工具類,這些都是在.NET平臺下使用C#實現的。
近期,項目存在向java平臺下移植的可能,爲了屏蔽JDBC底層API,使平移更加容易,FuWaer花了點時間對C#下OracleHelper進行了改造,改造的目的就是要基本保持原有函數接口形式和類型不變,爲此,OracleHelper包由如下類組成:
共10個文件,其中,ey.db.oracle包中的OracleHelper.java實現了對JDBC的封裝;ey.db.type包中的9個類是爲了保持OracleHelper類函數能夠和C#下的OracleHelper類函數的形式和參數類型一致而編寫的。
全部內容可以通過以下鏈接下載:(寫此文章時blog無法上傳文件,稍後上傳,如有需要也可留下您的email或自行編譯文末源代碼)
源文件:Java_OracleHelper_1_0_20071027_src.zip
JAR包:Java_OracleHelper_1_0_20071027_jar.jar
本工具包的使用實例可以參見《java下OracleHelper包使用實例》
接下來,FuWaer分別對每個類的功能進行簡短的介紹,全部源碼在文章末尾貼出了,如無法下載源代碼,也可分別拷貝源碼自行編譯。
DataColumn、DataRow、DataTable
這三個類是仿照C#中的對應類實現的,實現了二維表格數據的對象化存儲,目的在於對JDBC的ResultSet實現封裝,後面將會介紹,OracleHelper.java中的ConvertResultSetToDataTable函數及實現了從ResultSet構造DataTable的過程。
DataSet
這也是仿照C#中的DataSet實現的,它由一個或多個DataTable實例構成,該類用於OracleHelper.java中的ExecuteDataSet函數的返回值類型。它將方便已經熟悉了C#下DataSet操作的程序人員,對數據庫查詢的結果集將不再以底層的ResultSet存在,應用了DataSet,開發人員可以完全不用知道ResultSet的存在。
OracleConnection
該類是仿照C#中OracleClient命名空間下的OracleConnection實現的。OracleConnection類是對java.sql.Connection的封裝,經過封裝,開發人員將不用瞭解java.sql.Connection的相關內容。該類具有如下主要結構:
構造函數 public OracleConnection(String connectionString)
其中,connectionString是用來構造java.sql.Connection實例所必需的信息,規定connectionString應該具有如下格式:url;user;password,例如:jdbc:oracle:thin:@localhost:1521:db;system;manager
關閉數據庫連接函數 public void Close()
啓動事務函數 public OracleTransaction BeginTransaction()
OracleTransaction
該類是仿照C#中OracleClient命名空間下的OracleTransaction實現的。OracleTransaction用於事務控制,通常,該類的實例是通過OracleConnection.BeginTransaction()獲得的。該類具有如下主要結構:
構造函數 public OracleTransaction(OracleConnection connection)
事務提交函數 public void Commit()
事務回滾函數 public void Rollback()
CommandType
這是個枚舉類,用於指示訪問數據庫的是文本型sql語句還是存儲過程,該枚舉類定義如下:
public enum CommandType {
Text,
StoreProcedure
}
ParameterDirection
這是個枚舉類,用於指示傳遞給存儲過程的參數的方向性,該枚舉類定義如下:
public enum ParameterDirection {
IN,
OUT
}
Parameter
這個類用於存儲向oracle存儲過程所傳遞的參數。
OracleHelper
該類是訪問oracle數據庫的核心類,該類以靜態函數的形式提供了對數據庫訪問的功能函數,仿照C#下OracleHelper,提供了12個公有靜態函數和1個私有靜態函數,針對開發人員來說,主要是應用其中的12個公有靜態函數,關於這些函數,這裏就不再多說了,如果您對於C#下的SqlHelper或OracleHelper比較熟悉的話,您一定能很快地知道這些函數該如何使用,這裏FuWaer給個函數結構圖:
好了,下面給出這10個文件的源代碼
文件1:OracleHelper.java
import ey.db.type.*;
import java.sql.*;
/**
*
* @author FuWaer
* @version 1.0
*
*/
public class OracleHelper {
/**
*
* @param connectionString
* @param commandType
* @param commandText
* @return
* @throws Exception
*/
public static DataSet ExecuteDataSet(String connectionString,
CommandType commandType, String commandText) throws Exception {
return ExecuteDataSet(new OracleConnection(connectionString),
commandType, commandText);
}
/**
*
* @param connectionString
* @param commandType
* @param commandText
* @param parameters
* @return
* @throws Exception
*/
public static DataSet ExecuteDataSet(String connectionString,
CommandType commandType, String commandText,
Parameter... parameters) throws Exception {
return ExecuteDataSet(new OracleConnection(connectionString),
commandType, commandText, parameters);
}
/**
*
* @param connection
* @param commandType
* @param commandText
* @return
* @throws Exception
*/
public static DataSet ExecuteDataSet(OracleConnection connection,
CommandType commandType, String commandText) throws Exception {
return ExecuteDataSet(connection, commandType, commandText,
new Parameter[0]);
}
/**
*
* @param connection
* @param commandType
* @param commandText
* @param parameters
* @return
* @throws Exception
*/
public static DataSet ExecuteDataSet(OracleConnection connection,
CommandType commandType, String commandText,
Parameter... parameters) throws Exception {
DataSet ds = new DataSet();
if (commandType.equals(CommandType.Text)) {
Statement s = connection.GetConnection().createStatement();
ResultSet rs = s.executeQuery(commandText);
ds.AddTable(ConvertResultSetToDataTable(rs));
} else if (commandType.equals(CommandType.StoreProcedure)) {
Parameter[] paras = parameters;
String sql = "";
for (int i = 0; i < paras.length; i++) {
sql = sql + "?,";
}
if (sql.length() > 0) {
sql = "(" + sql.substring(0, sql.length() - 1) + ")";
}
sql = "{ call " + commandText + sql + " }";
CallableStatement proc = null;
proc = connection.GetConnection().prepareCall(sql);
for (int i = 0; i < paras.length; i++) {
Parameter p = paras[i];
if (p.parameterDirection == ParameterDirection.IN) {
proc.setObject(i + 1, p.Value, p.parameterType);
} else if (p.parameterDirection == ParameterDirection.OUT) {
proc.registerOutParameter(i + 1, p.parameterType);
}
}
try {
proc.execute();
for (int i = 0; i < paras.length; i++) {
Parameter p = paras[i];
if (p.parameterDirection == ParameterDirection.OUT) {
p.Value = proc.getObject(i + 1);
if (p.parameterType == oracle.jdbc.OracleTypes.CURSOR) {
ResultSet rs = (ResultSet) p.Value;
DataTable dt = ConvertResultSetToDataTable(rs);
DataSet _lds = new DataSet();
_lds.AddTable(dt);
p.Value = _lds;
ds.AddTable(dt);
}
}
}
} catch (Exception e) {
throw e;
} finally {
connection.Close();
}
} else {
throw new Exception("commandType is invalid");
}
return ds;
}
/**
*
* @param transaction
* @param commandType
* @param commandText
* @return
* @throws Exception
*/
public static DataSet ExecuteDataSet(OracleTransaction transaction,
CommandType commandType, String commandText) throws Exception {
return ExecuteDataSet(transaction.Connection, commandType, commandText);
}
/**
*
* @param transaction
* @param commandType
* @param commandText
* @param parameters
* @return
* @throws Exception
*/
public static DataSet ExecuteDataSet(OracleTransaction transaction,
CommandType commandType, String commandText,
Parameter... parameters) throws Exception {
return ExecuteDataSet(transaction.Connection, commandType, commandText,
parameters);
}
/**
*
* @param connectionString
* @param commandType
* @param commandText
* @throws Exception
*/
public static void ExecuteNonQuery(String connectionString,
CommandType commandType, String commandText) throws Exception {
ExecuteNonQuery(new OracleConnection(connectionString), commandType,
commandText);
}
/**
*
* @param connectionString
* @param commandType
* @param commandText
* @param parameters
* @throws Exception
*/
public static void ExecuteNonQuery(String connectionString,
CommandType commandType, String commandText,
Parameter... parameters) throws Exception {
ExecuteNonQuery(new OracleConnection(connectionString), commandType,
commandText, parameters);
}
/**
*
* @param connection
* @param commandType
* @param commandText
* @throws Exception
*/
public static void ExecuteNonQuery(OracleConnection connection,
CommandType commandType, String commandText) throws Exception {
ExecuteNonQuery(connection, commandType, commandText, new Parameter[0]);
}
/**
*
* @param connection
* @param commandType
* @param commandText
* @param parameters
* @throws Exception
*/
public static void ExecuteNonQuery(OracleConnection connection,
CommandType commandType, String commandText,
Parameter... parameters) throws Exception {
if (commandType.equals(CommandType.Text)) {
Statement s = connection.GetConnection().createStatement();
s.execute(commandText);
} else if (commandType.equals(CommandType.StoreProcedure)) {
Parameter[] paras = parameters;
String sql = "";
for (int i = 0; i < paras.length; i++) {
sql = sql + "?,";
}
if (sql.length() > 0) {
sql = "(" + sql.substring(0, sql.length() - 1) + ")";
}
sql = "{ call " + commandText + sql + " }";
CallableStatement proc = null;
proc = connection.GetConnection().prepareCall(sql);
for (int i = 0; i < paras.length; i++) {
Parameter p = paras[i];
if (p.parameterDirection == ParameterDirection.IN) {
proc.setObject(i + 1, p.Value, p.parameterType);
} else if (p.parameterDirection == ParameterDirection.OUT) {
proc.registerOutParameter(i + 1, p.parameterType);
}
}
try {
proc.execute();
for (int i = 0; i < paras.length; i++) {
Parameter p = paras[i];
if (p.parameterDirection == ParameterDirection.OUT) {
p.Value = proc.getObject(i + 1);
if (p.parameterType == oracle.jdbc.OracleTypes.CURSOR) {
ResultSet rs = (ResultSet) p.Value;
DataTable dt = ConvertResultSetToDataTable(rs);
DataSet _lds = new DataSet();
_lds.AddTable(dt);
p.Value = _lds;
}
}
}
} catch (Exception e) {
throw e;
} finally {
connection.Close();
}
} else {
throw new Exception("commandType is invalid");
}
}
/**
*
* @param transaction
* @param commandType
* @param commandText
* @throws Exception
*/
public static void ExecuteNonQuery(OracleTransaction transaction,
CommandType commandType, String commandText) throws Exception {
ExecuteNonQuery(transaction.Connection, commandType, commandText);
}
/**
*
* @param transaction
* @param commandType
* @param commandText
* @param parameters
* @throws Exception
*/
public static void ExecuteNonQuery(OracleTransaction transaction,
CommandType commandType, String commandText,
Parameter... parameters) throws Exception {
ExecuteNonQuery(transaction.Connection, commandType, commandText,
parameters);
}
/**
* 將ResultSet裝換爲DataTable的函數
*
* @param rs
* @return
* @throws Exception
*/
private static DataTable ConvertResultSetToDataTable(ResultSet rs)
throws Exception {
ResultSetMetaData rsmd = rs.getMetaData();
int columnCount = rsmd.getColumnCount();
DataTable dt = new DataTable();
while (rs.next()) {
DataRow dr = new DataRow();
for (int i = 1; i <= columnCount; i++) {
DataColumn dc = new DataColumn(rsmd.getColumnName(i), rs
.getObject(i));
dr.AddColumn(dc);
}
dt.AddRow(dr);
}
return dt;
}
}
文件2:DataColumn.java
/**
*
* @author FuWaer
* @version 1.0
*/
public class DataColumn extends Object {
public DataColumn()
{
}
public DataColumn(String n,Object v)
{
colName = n;
colValue = v;
}
public Object colValue = null;
public String colName = null;
}
文件3:DataRow.java
/**
*
* @author FuWaer
* @version 1.0
*
*/
public class DataRow extends Object {
public DataRow(DataColumn[] cols)
{
Columns = cols.clone();
}
public DataRow()
{
}
public void AddColumn(DataColumn col)
{
DataColumn[] _cols = Columns.clone();
Columns = null;
Columns = new DataColumn[_cols.length+1];
for(int i=0;i<_cols.length;i++)
{
Columns[i] = _cols[i];
}
Columns[Columns.length-1] = col;
_cols = null;
}
public DataColumn [] Columns = new DataColumn[0];
}
文件4:DataTable.java
/**
*
* @author FuWaer
* @version 1.0
*/
public class DataTable {
public DataTable(DataRow[] rows)
{
Rows = rows.clone();
}
public DataTable()
{
}
public void AddRow(DataRow row)
{
DataRow[] _rows = Rows.clone();
this.Rows = null;
this.Rows = new DataRow[_rows.length+1];
for(int i=0;i<_rows.length;i++)
{
this.Rows[i] = _rows[i];
}
this.Rows[this.Rows.length-1] = row;
_rows = null;
}
public DataRow[] Rows = new DataRow[0];
}
文件5:DataSet.java
/**
*
* @author FuWaer
* @version 1.0
*/
public class DataSet {
public DataSet(DataTable[] tables)
{
this.Tables = tables.clone();
}
public DataSet()
{
}
public void AddTable(DataTable table)
{
DataTable[] _tables = this.Tables.clone();
this.Tables = null;
this.Tables = new DataTable[_tables.length+1];
for(int i=0;i<_tables.length;i++)
{
this.Tables[i] = _tables[i];
}
this.Tables[this.Tables.length-1] = table;
_tables = null;
}
public DataTable[] Tables = new DataTable[0];
}
文件6:OracleConnection.java
import java.sql.*;
/**
*
* @author FuWaer
* @version 1.0
*/
public class OracleConnection {
/**
* OracleConnection構造函數
* @param String connectionString :
* 數據庫連接參數,格式:url;user;passworld.
* 例如:jdbc:oracle:thin:@localhost:1521:db;system;manager
* @throws Exception
*/
public OracleConnection(String connectionString) throws Exception
{
Class.forName(this._driver);
String[] _sa = connectionString.split(";");
this.connection = DriverManager.getConnection(_sa[0], _sa[1], _sa[2]);
}
/**
* 關閉數據庫連接
* @throws Exception
*/
public void Close() throws Exception
{
if(!connection.isClosed()&&connection.getAutoCommit())
{
this.connection.close();
}
}
/**
* 從OracleConnection類創建事務處理的OracleTransaction類實例
* @return
* @throws Exception
*/
public OracleTransaction BeginTransaction() throws Exception
{
OracleTransaction tran = new OracleTransaction(this);
return tran;
}
/**
* 獲取java.sql.Connection對象
* @return java.sql.Connection對象
*/
public Connection GetConnection()
{
return this.connection;
}
private String _driver = "oracle.jdbc.driver.OracleDriver";
private Connection connection = null;
}
文件7:OracleTransaction.java
/**
*
* @author FuWaer
* @version 1.0
*/
public class OracleTransaction {
public OracleTransaction(OracleConnection connection) throws Exception
{
this.Connection = connection;
this.Connection.GetConnection().setAutoCommit(false);
}
/**
* 事務提交
* @throws Exception
*/
public void Commit() throws Exception
{
try
{
this.Connection.GetConnection().commit();
}
catch(Exception e)
{
throw e;
}
finally
{
this.Connection.GetConnection().setAutoCommit(true);
this.Connection.Close();
}
}
/**
* 事務回滾
* @throws Exception
*/
public void Rollback() throws Exception
{
try
{
this.Connection.GetConnection().rollback();
}
catch(Exception e)
{
throw e;
}
finally
{
this.Connection.GetConnection().setAutoCommit(true);
this.Connection.Close();
}
}
public OracleConnection Connection = null;
}
文件8:CommandType.java
/**
* 命令類型枚舉類
* @author FuWaer
* @version 1.0
*/
public enum CommandType {
Text,
StoreProcedure
}
文件9:ParameterDirection.java
/**
*
* @author FuWaer
* @version 1.0
*/
public enum ParameterDirection {
IN,
OUT
}
文件10:Parameter.java
/**
*
* @author FuWaer
* @version 1.0
*/
public class Parameter {
public Parameter(
String paraName,
int paraType,
Object paraValue,
ParameterDirection paraDirection
)
{
this.parameterName = paraName;
this.parameterType = paraType;
this.Value = paraValue;
this.parameterDirection = paraDirection;
}
public Parameter(
String paraName,
int paraType,
Object paraValue
)
{
this.parameterName = paraName;
this.parameterType = paraType;
this.Value = paraValue;
this.parameterDirection = ParameterDirection.IN;
}
public String parameterName = "";
public Object Value = null;
public ParameterDirection parameterDirection = null;
public int parameterType = 0;
}