package DBConnection_Sql;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.util.HashMap;
import dao_sql.WebBean;
/**
* @author Administrator
*
* TODO 要更改此生成的类型注释的模板,请转至
* 窗口 - 首选项 - Java - 代码样式 - 代码模板
*/
public class DBConnection extends WebBean
{
public String []FieldName;//存放数据库中的字段名字
public int CountField=0;//表示有多少个字段
public DBConnection()
{
}
public String gb2iso(String qs)
{
try
{
if (qs == null)
return "NULL";
else
{
String newStr= new String(qs.getBytes("gb2312"),"iso8859-1");
return newStr;
}
}
catch(Exception e)
{
System.err.println("gb2iso error:"+e.getMessage());
}
return "NULL";
}
public String iso2gb(String qs)
{
try
{
if (qs == null)
return "NULL";
else
{
String newStr= new String(qs.getBytes("iso8859-1"),"gb2312");
return newStr;
}
}
catch(Exception e)
{
System.err.println("iso2gb error:"+e.getMessage());
}
return "NULL";
}
public boolean ModiData(String Sql)
{
PreparedStatement pstmt = null;
HashMap hm=new HashMap();
try
{
if (!getConnection())
{
return false;
}
pstmt = conn.prepareStatement(Sql);
int i = pstmt.executeUpdate();
pstmt.close();
}
catch (Exception e)
{
println(e);
return false;
}
finally
{
free(pstmt);
}
return true;
}
//根据SQL语句来把查询的结果放在HASHMAP里
public HashMap GetData(String Sql)
{
PreparedStatement pstmt = null;
HashMap hm=new HashMap();
try
{
if (!getConnection())
{
return null;
}
pstmt = conn.prepareStatement(Sql);
hm= getRS(pstmt.executeQuery());
}
catch (Exception e) {
println(e);
} finally {
free(pstmt);
}
return hm;
}
//得到总的查询记录
public int getCount(String sql)
{
PreparedStatement pstmt = null ;
int count = 0 ;
try
{
if(!getConnection())
{
return 0 ;
}
pstmt = conn.prepareStatement(sql);
count = getCount(pstmt.executeQuery()) ;
} catch (Exception e)
{
println(e);
}
finally
{
free(pstmt);
}
return count ;
}
//根据表名返回字段名
private void GetFiels(String TableName)
{
PreparedStatement pstmt = null;
HashMap hm=new HashMap();
String SqlStr="select * from "+TableName;
try
{
pstmt = conn.prepareStatement(SqlStr);
hm= getRS(pstmt.executeQuery());
ResultSet rs = pstmt.executeQuery();
ResultSetMetaData Temp=rs.getMetaData();
CountField=Temp.getColumnCount();
FieldName=new String[CountField];
for(int j=0;j<CountField;j++)
{
FieldName[j]=Temp.getColumnName(j+1);
}
rs.close();
pstmt.close();
return;
}
catch (Exception e)
{
println(e);
}
}
//根据表名字把字段和字段的数目放到FieldName 和 CountField
public void GetFiels2(String TableName)
{
PreparedStatement pstmt = null;
HashMap hm=new HashMap();
String SqlStr="select * from "+TableName;
try
{
if (!getConnection())
{
return;
}
pstmt = conn.prepareStatement(SqlStr);
hm= getRS(pstmt.executeQuery());
ResultSet rs = pstmt.executeQuery();
ResultSetMetaData Temp=rs.getMetaData();//获得RESULTSET中的表格数据类型
CountField=Temp.getColumnCount(); //获得 ResultSet 中的列数。
FieldName=new String[CountField];
for(int j=0;j<CountField;j++)
{
FieldName[j]=Temp.getColumnName(j+1);//获得列名。
System.out.print(FieldName[j]);
}
rs.close();
pstmt.close();
return;
}
catch (Exception e)
{
println(e);
}
return;
}
//用来执行inserto update delete
public void GetFieldBySql(String SqlStr)
{
PreparedStatement pstmt = null;
HashMap hm=new HashMap();
try
{
if (!getConnection())
{
return;
}
pstmt = conn.prepareStatement(SqlStr);
hm= getRS(pstmt.executeQuery());
ResultSet rs = pstmt.executeQuery();
ResultSetMetaData Temp=rs.getMetaData();
CountField=Temp.getColumnCount();
FieldName=new String[CountField];
for(int j=0;j<CountField;j++)
{
FieldName[j]=Temp.getColumnName(j+1);
}
rs.close();
pstmt.close();
return;
}
catch (Exception e)
{
println(e);
}
finally
{
free(pstmt);
}
return;
}
//根据表名 你要添加的数据 对数据库进行添加功能
public boolean AddData(String Table,Object[] Data)
{
String sqlstr1 = "select * from "+Table ;
int sss = 0;
PreparedStatement pstmt = null;
try {
try {
if(!getConnection())
{
return false;
}
} catch (Exception e2) {
e2.printStackTrace();
}
pstmt = conn.prepareStatement(sqlstr1) ;
} catch (SQLException e1) {
e1.printStackTrace();
}
ResultSet rs = null;
try {
rs = pstmt.executeQuery();
} catch (SQLException e2) {
e2.printStackTrace();
}
ResultSetMetaData Temp = null;
try {
Temp = rs.getMetaData();
} catch (SQLException e3) {
e3.printStackTrace();
}
try {
if(Temp.isAutoIncrement(1))
{
sss = 1 ;
}
else
{
sss = 0 ;
}
} catch (SQLException e4) {
e4.printStackTrace();
}
HashMap hm=new HashMap();
try
{
GetFiels(Table);
String SqlStr = "insert "+Table+"(";
for(int i=sss;i<CountField;i++)
{
SqlStr+=FieldName[i];
if(i<CountField-1)
{
SqlStr+=",";
}
else
{
SqlStr+=")values(";
}
}
for(int i=sss;i<CountField;i++)
{
SqlStr+="?";
if(i<CountField-1)
{
SqlStr+=",";
}
else
{
SqlStr+=")";
}
}
pstmt = conn.prepareStatement(SqlStr);
for(int i=0;i<CountField-sss;i++)
{
if(Data[i].getClass().getName().equals("java.lang.String"))
{
String sTemp=gb2iso(Data[i].toString());
pstmt.setString(i+1,sTemp);
}
if(Data[i].getClass().getName().equals("java.lang.Integer"))
{
pstmt.setObject(i+1,Data[i]);
}
}
pstmt.executeUpdate();
pstmt.close();
conn.close();
}
catch(Exception e)
{
println(e);
return false;
}
return true;
}
//数据库的表名 字段名 和你要修改的数据 条件 来进行对数据库的 修改
public boolean ModiData(String Table, String[] Fields,Object[] Data,String Limit)
{
PreparedStatement pstmt = null;
HashMap hm=new HashMap();
try
{
if(!getConnection())
{
return false;
}
int m=Fields.length;
String SqlStr="update "+Table+" set ";
for(int i = 0;i < m;i++)
{
SqlStr+= Fields[i]+"=?";
if(i<m-1)
{
SqlStr+=",";
}
else
{
SqlStr+=" ";
}
}
SqlStr+=Limit;
pstmt = conn.prepareStatement(SqlStr);
for(int i=0;i<m;i++)
{
if(Data[i].getClass().getName().equals("java.lang.String"))
{
String sTemp=Data[i].toString();
pstmt.setString(i+1,sTemp);
}
if(Data[i].getClass().getName().equals("java.lang.Integer"))
{
pstmt.setObject(i+1,Data[i]);
}
}
pstmt.executeUpdate();
pstmt.close();
conn.close();
}
catch (Exception e)
{
println(e);
}
return true;
}
//进行修改Table表名,Fields[]字段名 Data[]字段数据,Limit修改的条件
public boolean ModiData(String Table,Object[] Data,String Limit)
{
PreparedStatement pstmt = null;
HashMap hm=new HashMap();
try
{
if (!getConnection())
{
return false;
}
GetFiels(Table);
if(CountField!=Data.length)
{
return false;
}
String SqlStr = "update "+Table+" set ";
for(int i = 0;i < CountField;i++)
{
SqlStr+= FieldName[i]+"=?";
if(i<CountField-1)
{
SqlStr+=",";
}
else
{
SqlStr+=" ";
}
}
SqlStr+=Limit;
System.out.println(SqlStr);
pstmt = conn.prepareStatement(SqlStr);
for(int i=0;i<CountField;i++)
{
if(Data[i].getClass().getName().equals("java.lang.String"))
{
String sTemp=Data[i].toString();
pstmt.setString(i+1,sTemp);
}
if(Data[i].getClass().getName().equals("java.lang.Integer"))
{
pstmt.setObject(i+1,Data[i]);
}
}
System.out.println(SqlStr);
pstmt.executeUpdate();
pstmt.close();
conn.close();
} catch (Exception e)
{
println(e);
}
finally
{
free(pstmt);
}
return true;
}
}
posted on 2006-03-29 15:50
xiaozhi 阅读(281)
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