sql动态条件查询语句
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共2个回答
热心网友
你的意思是通过程序来添加查询吧，我给你一个代码参考
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import Jdbc.Util.DBPUtil;
public class PreparedStatementDemo {
public static void main(String[] args)
{
PreparedStatementDemo psd = new PreparedStatementDemo();
psd.updateSalary("JACOB",3000);//给方法传入2个参数，执行sql语句
psd.selectSalary("JACOB");
}
public void updateSalary(String ename,double sal)
{
String sql = "Update stu_emp set sal= ? Where ename = ?";
Connection cn = null;
PreparedStatement ps = null;
try
{
cn = DBPUtil.getConnection();
ps = cn.prepareStatement(sql);
ps.setDouble(1, sal);
ps.setString(2, ename);
int num = ps.executeUpdate();
System.out.println("提示：总共有 "+num+" 条数据已经更新！");
}
catch (SQLException e)
{
e.printStackTrace();
}
finally
{
DBPUtil.stmtClose(ps);
DBPUtil.connClose(cn);
}
}
public void selectSalary(String name)
{
String sql = "Select * From stu_emp Where ename = ?";
Connection cn = null;
PreparedStatement ps = null;
ResultSet rs = null;
try
{
cn = DBPUtil.getConnection();
ps = cn.prepareStatement(sql);
ps.setString(1, name);
rs = ps.executeQuery();
while(rs.next())
{
System.out.println(rs.getString("ename")+" 的工资是： "+ rs.getInt("sal"));
}
}
catch (SQLException e)
{
e.printStackTrace();
}
finally
{
DBPUtil.stmtClose(ps);
DBPUtil.rsClose(rs);
DBPUtil.connClose(cn);
}
}
}
热心网友
哪个环境,ACCESS,还是SQL SERVER,还是ORACLE?追问ORACLE
