} } }

    JAVA数据库处理惩罚(连接,数据查询,成果集返回)

    添加时间:2013-7-23 点击量:

    package  john
    
    import java.io.IOException;
    import java.util.;
    public class QueryDataRow
    {
    public HashMap hashColumn;

    private String[] data;
    public QueryDataRow()
    {
    super();
    }
    public String get(String str) throws IOException
    {
    int colindex = ((Integer) (hashColumn.get(str))).intValue();
    return DBUtil.deTransSql(data[colindex]);
    }
    public void setData(String[] s)
    {
    this.data = new String[s.length];
    forint i = 0; i < s.length; i++
    {
    this.data[i] = s[i];
    }
    }
    public void resetColumn(String columnName, String columnValue)
    {
    int colindex = ((Integer) (hashColumn.get(columnName))).intValue();
    data[colindex]
    = columnValue;
    }
    }



    package john
    
    import java.util.;
    import java.sql.;
    public class QueryData
    {
    private ArrayList rows;
    public QueryData()
    {
    rows
    = new ArrayList();
    rows.clear();
    }
    public boolean setData(ResultSet rs) throws Exception
    {
    boolean ret = false;
    try
    {
    ResultSetMetaData rsdata
    = rs.getMetaData();
    int ColumnCount = rsdata.getColumnCount();
    String Columns[]
    = new String[ColumnCount];

    HashMap hashColumn
    = new HashMap();

    forint i = 0; i < ColumnCount; i++
    {
    Columns[i]
    = rsdata.getColumnName(i + 1);
    hashColumn.put(Columns[i],
    new Integer(i));
    }
    while (rs.next())
    {
    String rowdata[]
    = new String[ColumnCount];

    forint i = 0; i < ColumnCount; i++
    {
    String column
    = Columns[i];

    String value
    = rs.getString(column);

    value
    = (value != null ? value : );
    rowdata[i]
    = value;
    }

    QueryDataRow row
    = new QueryDataRow();
    row.hashColumn
    = hashColumn;
    row.setData(rowdata);
    rows.add(row);
    }

    ret
    = true;
    }
    catch (Exception e)
    {
    ret
    = false;
    throw e;
    }
    return ret;
    }
    public boolean removeRow(int index) throws Exception
    {
    try
    {
    if (rows != null
    {
    rows.remove(index);
    return true;
    }
    else
    {
    return false;
    }
    }
    catch (Exception ex)
    {
    throw ex;
    }
    }
    public QueryDataRow getRow(int index) throws Exception
    {
    try
    {
    if (rows != null
    {
    QueryDataRow row
    = new QueryDataRow();
    return (QueryDataRow) rows.get(index);
    }
    else
    {
    return null;
    }

    }
    catch (Exception ex)
    {
    throw ex;
    }
    }
    public int size()
    {
    if (rows != null
    {
    return rows.size();
    }
    else
    {
    return 0;
    }
    }
    }



    package john
    
    import java.io.IOException;
    import java.sql.;
    import javax.sql.;

    public class DBUtil
    {

    public static final String STRING = 0;
    public static final String DATE = 1;
    public static final String INT = 2;

    private Connection conn = null; //DB接続

    private ResultSet sqlResult = null;
    private DataSource ds = null;
    Statement sqlStatement
    = null;

    / エラー情報/
    public String errStr = null;

    private static Logger logger = Logger.getLogger(DBUtil.class.getName());

    static
    {
    try
    {
    Class.forName(
    oracle.jdbc.driver.OracleDriver);
    }
    catch (Exception ex)
    {
    ex.printStackTrace();
    }
    }
    public DBUtil(Connection pConn)
    {
    conn
    = pConn; //DB接続

    sqlResult
    = null;
    ds
    = null;
    sqlStatement
    = null;
    errStr
    = new String();
    }
    public Connection connOpen() throws Exception
    {
    try
    {
    if (Common.CONN_FLAG == true
    {
    String strDbIp
    = Common.getData(other.dbhost);
    String strDbPort
    = Common.getData(other.dbport);
    String strDbName
    = Common.getData(other.dbname);
    String strUsername
    = Common.getData(other.dbuser);
    String strPassword
    = Common.getData(other.dbpswd);
    String strDBUrl
    = jdbc:oracle:thin:@+strDbIp+:+strDbPort+:+strDbName;
    conn
    = DriverManager.getConnection(strDBUrl, strUsername, strPassword);
    }
    conn.setAutoCommit(
    false);
    sqlStatement
    = null;
    sqlStatement
    = conn.createStatement();
    return conn;
    }
    catch (SQLException e)
    {
    String strErr
    = SQL connection error: /n
    + e.getMessage();
    logger.error(
    DBUTIL,strErr);
    this.errStr += strErr;
    throw new BaseException(syserr);
    }
    }
    public void connClose() throws Exception
    {
    try
    {
    if(sqlStatement != null
    sqlStatement.close();
    sqlStatement
    = null;
    if(conn != null
    if(!conn.isClosed())
    conn.close();
    conn
    = null;
    }
    catch (SQLException ex)
    {
    logger.error(
    DBUTIL,ex.getMessage());
    logger.error(
    DBUTIL,DB closing exception!);
    throw new BaseException(syserr);
    }
    }
    public QueryData selQuery(String strQuerySQL) throws Exception
    {
    try
    {
    QueryData qd
    = new QueryData();
    Statement tmpSQLStatement
    = conn.createStatement();
    tmpSQLStatement.execute(transSql(strQuerySQL));
    sqlResult
    = null;
    sqlResult
    = tmpSQLStatement.getResultSet();
    qd.setData(sqlResult);
    if(sqlResult != null) sqlResult.close();
    sqlResult
    = null;
    tmpSQLStatement.close();
    tmpSQLStatement
    = null;
    logger.error(
    DBUTIL,strQuerySQL);
    return qd;
    }
    catch(Exception e)
    {
    logger.error(
    DBUTIL,SQL error: + strQuerySQL);
    logger.error(
    DBUTIL,e.getMessage());
    throw new BaseException(syserr);
    }
    finally
    {
    }
    }
    public QueryData selQureyPrep(String pQuerySql,String[][] conditionlist) throws Exception
    {
    try
    {
    QueryData qd
    = new QueryData();
    PreparedStatement prep
    = conn.prepareStatement(transSql(pQuerySql));
    int cnt = 0;
    forint x = 0; x < conditionlist.length;x++
    {
    boolean isFalse = true;
    while (isFalse)
    {
    int mode = 0;
    String strMode
    =conditionlist[x][0];
    if (!Common.checkNull(strMode))
    {
    isFalse
    = false;
    break;
    }
    else
    {
    cnt
    ++;
    mode
    = Integer.parseInt(strMode);
    }
    switch (mode)
    {
    case 0:
    prep.setString(cnt,String.valueOf(conditionlist[x][
    1]));
    isFalse
    = false;
    break;
    case 1:
    prep.setDate(cnt,Date.valueOf(conditionlist[x][
    1]));
    isFalse
    = false;
    break;
    case 2:
    prep.setInt(cnt,Integer.parseInt(conditionlist[x][
    1]));
    isFalse
    = false;
    break;
    default :
    isFalse
    = false;
    break;
    }
    }
    }
    sqlResult
    = null;
    sqlResult
    = prep.executeQuery();
    qd.setData(sqlResult);
    if(sqlResult != null) sqlResult.close();
    sqlResult
    = null;
    prep.close();
    prep
    = null;
    logger.error(
    DBUTIL,pQuerySql);
    return qd;
    }
    catch(Exception e)
    {
    logger.error(
    DBUTIL,SQL error: + pQuerySql);
    logger.error(
    DBUTIL,e.getMessage());
    throw new BaseException(syserr);
    }
    finally
    {
    }
    }
    public ResultSet selQuery_large(String strQuerySQL) throws Exception
    {
    try
    {
    sqlStatement.execute(transSql(strQuerySQL));
    sqlResult
    = sqlStatement.getResultSet();
    logger.error(
    DBUTIL,strQuerySQL);
    return sqlResult;
    }
    catch(SQLException e)
    {
    logger.error(
    DBUTIL,SQL error: + strQuerySQL);
    logger.error(
    DBUTIL,e.getMessage());
    throw new BaseException(syserr);
    }
    finally
    {
    }
    }
    public void doQuery(String strQuerySQL) throws Exception
    {
    try
    {
    Statement SQLStatement
    = conn.createStatement();

    SQLStatement.executeUpdate(transSql(strQuerySQL));
    logger.error(
    DBUTIL,strQuerySQL);
    SQLStatement.close();
    SQLStatement
    = null;

    }
    catch(SQLException e)
    {
    logger.error(
    DBUTIL,SQL error: + strQuerySQL);
    logger.error(
    DBUTIL,e.getMessage());
    throw new BaseException(syserr);
    }
    finally
    {
    }
    }
    public void doQueryPrep(String pQuerySql,String[][] conditionlist) throws Exception
    {
    try
    {
    PreparedStatement prep
    = conn.prepareStatement(transSql(pQuerySql));
    int cnt = 0;
    forint x = 0; x < conditionlist.length;x++){
    boolean isFalse = true;
    while (isFalse){
    int mode = 0;
    String strMode
    =conditionlist[x][0];
    if (!Common.checkNull(strMode)){
    isFalse
    = false;
    break;
    }
    else{
    cnt
    ++;
    mode
    = Integer.parseInt(strMode);
    }
    switch (mode) {
    case 0:
    prep.setString(cnt,String.valueOf(conditionlist[x][
    1]));
    isFalse
    = false;
    break;
    case 1:
    prep.setDate(cnt,Date.valueOf(conditionlist[x][
    1]));
    isFalse
    = false;
    break;
    case 2:
    prep.setInt(cnt,Integer.parseInt(conditionlist[x][
    1]));
    isFalse
    = false;
    break;
    default :
    isFalse
    = false;
    break;
    }
    }
    }
    prep.executeUpdate();
    logger.error(
    DBUTIL,SQL error: + pQuerySql);
    prep.close();
    prep
    = null;

    }
    catch(SQLException e)
    {
    logger.error(
    DBUTIL,SQL error: + pQuerySql);
    logger.error(
    DBUTIL,e.getMessage());
    throw new BaseException(syserr);
    }
    finally
    {
    }
    }
    public boolean doCommit() throws Exception
    {
    try
    {
    conn.commit();
    return true;
    }
    catch (SQLException e)
    {
    logger.error(
    DBUTIL,SQL commit error! );
    logger.error(
    DBUTIL,e.getMessage());
    conn.rollback();
    throw new BaseException(syserr);
    }
    finally
    {
    }
    }
    public void doRollback() throws Exception
    {
    try
    {
    if(conn != null
    conn.rollback();
    }
    catch (Exception e)
    {
    logger.error(
    DBUTIL,SQL rollback error! );
    logger.error(
    DBUTIL,e.getMessage());
    }
    }
    public static String transSql(String strInput) throws IOException
    {
    String strOutput
    = strInput;
    //return EucJpFile.toJIS(strOutput);
    return strOutput;
    }
    public static String deTransSql(String strInput) throws IOException
    {
    String strOutput
    = strInput;
    return strOutput;
    //return EucJpFile.toCp932(strOutput);
    }
    }



    以下是JAVA对DB操纵的一种实现体式格式,与大师一路共享,对初学者可能有必然的帮助,当然对高手而 言,用处就不见的大了,迎接大师提出更好的定见和建议.为了贸易规矩,代码的注释去掉了,请大师见谅.


     

    我们永远不要期待别人的拯救,只有自己才能升华自己。自己已准备好了多少容量,方能吸引对等的人与我们相遇,否则再美好的人出现、再动人的事情降临身边,我们也没有能量去理解与珍惜,终将擦肩而过。—— 姚谦《品味》
    分享到: