EmployeeDao.java
//删除数据
public boolean deleteEmployeeById(int id){
boolean result = false
try{
con = DBCon.getConn()
String sql = "delete from tb_employee where id=?"
pstmt = (PreparedStatement) con.prepareStatement(sql)
pstmt.setInt(1, id)
int i = pstmt.executeUpdate()
if(i == 1)
result = true
}catch(Exception e){
e.printStackTrace()
}finally{
try{
if(pstmt != null){
pstmt.close()
}
}catch(Exception e){
e.printStackTrace()
}
try{
if(con != null){
con.close()
}
}catch(Exception e){
e.printStackTrace()
}
}
return result
}
TestSql2.java
package com.sql.test
import com.sql.dao.EmployeeDao
public class TestSql02 {
public static void main(String[] args){
boolean result = EmployeeDao.getInstance().deleteEmployeeById(1)
if(result == true){
System.out.println("删除成功!")
}else{
System.out.println("删除失败!")
}
}
}
1.增加\x0d\x0aString s1="insert into tableNames (id,name,password) values(myseq.nextval,?,?)"\x0d\x0aClass.forName(driver)\x0d\x0aConnection conn = DriverManager.getConnection(url,dbUser,dbPwd)\x0d\x0aPreparedStatement prepStmt = conn.prepareStatement(s1)\x0d\x0aprepStmt.setString(1,name)\x0d\x0aprepStmt.setString(2,password)\x0d\x0aResultSet rs=stmt.executeUpdate()\x0d\x0a2、删除\x0d\x0aString s2="delete from tbNames where name=?"\x0d\x0aClass.forName(driver)\x0d\x0aConnection conn = DriverManager.getConnection(url,dbUser,dbPwd)\x0d\x0aPreparedStatement prepStmt = conn.prepareStatement(s2)\x0d\x0aprepStmt.setString(1,name)\x0d\x0aResultSet rs=stmt.executeUpdate()\x0d\x0a3、修改\x0d\x0aString s3=“update tbNames set name=? where id=?”\x0d\x0aClass.forName(driver)\x0d\x0aConnection conn = DriverManager.getConnection(url,dbUser,dbPwd)\x0d\x0aPreparedStatement prepStmt = conn.prepareStatement(s3)\x0d\x0aprepStmt.setString(1,name)\x0d\x0aprepStmt.setString(2,id)\x0d\x0aResultSet rs=stmt.executeUpdate()\x0d\x0a4、查询\x0d\x0aString s4="select id,name,password from tbNames"\x0d\x0aClass.forName(driver)\x0d\x0aConnection conn = DriverManager.getConnection(url,dbUser,dbPwd)\x0d\x0aStatement stmt=conn.createStatement()\x0d\x0aResultSet rs = stmt.executeQuery(s4)\x0d\x0awhile(rs.next){\x0d\x0aint id=rs.getInt(1)\x0d\x0aString name = rs.getString(2)\x0d\x0aString pwd=rs.getString(3)\x0d\x0aSystem.out.println(id+name+pwd)} \x0d\x0a\x0d\x0a以上四步必须都得关闭连接;!!!\x0d\x0ars.close()\x0d\x0astmt.close()\x0d\x0aconn.close()欢迎分享,转载请注明来源:内存溢出
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