JDBC實現增刪改查

首先建立起資料庫連線

//1、載入驅動

class.
forname
("com.mysql.jdbc.driver");
//2、獲取與資料庫的連線
string username =
"root"
;        string password =
"123456"
;        string url =
"jdbc:mysql://localhost:3306/jdbcstudy"
;        connection conn = drivermanager.
getconnection
(url, username, password)
;

statement st = conn.

createstatement()
;string sql =
"insert into 表名(欄位1,欄位2....) values(值1,值2...)"
;int num = st.
executeupdate
(sql)
;//num為改變的行數
if(num>0)

statement st = conn.

createstatement()
;string sql =
"update 表名 set 字段 = '值' where 條件 "
;int num = st.
executeupdate
(sql);if
(num>0)

statement st = conn.

createstatament()
;string sql =
"delete from 表名 where 條件"
;in num = st.
executeupdate
(sql);if
(num>0)

statement st = conn.

createstatament()
;string sql =
"select * from 表名 where 條件"
;resultset rs = st.
executequery
(sql)
;where
(rs.next)

首先建立乙個db.properties檔案，將下面這些建立連線時所用放入其中

driver = com.mysql.jdbc.driver

username = root
password =
123456
url = jdbc:mysql:
//localhost:
3306
/jdbcstudy?usessl=
true

public

class
jdbcutils
catch
(ioexception e)
catch
(classnotfoundexception e)
}//獲取資料庫連線物件
public
static connection getconnection()
throws sqlexception 
//釋放資源
public
static
void
closeall
(resultset resultset, statement statement,connection connection)
catch
(sqlexception e)}if
(statement!=null)
catch
(sqlexception e)}if
(connection!=null)
catch
(sqlexception e)}}
}

public

class
test1
catch
(sqlexception e)
finally
}@test
public
void
delete()
}catch
(sqlexception e)
finally
}@test
public
void
update()
}catch
(sqlexception e)
finally
}@test
public
void
query()
}catch
(sqlexception e)
finally
}}

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