e4a是一款非常流行的Android App開發(fā)軟件，可以使用e4a連接MySQL數(shù)據(jù)庫進(jìn)行數(shù)據(jù)操作。下面詳細(xì)介紹如何通過e4a連接MySQL數(shù)據(jù)庫。

步驟一：導(dǎo)入MySQL驅(qū)動包

'聲明DriverManager
Dim driver As String
driver = "com.mysql.jdbc.Driver"
'加載MySQL驅(qū)動
JDBC.Initialize("com.mysql.jdbc.Driver")

步驟二：連接MySQL數(shù)據(jù)庫

'連接MySQL數(shù)據(jù)庫
Dim con As String
Dim user As String
Dim passwd As String
Dim url As String
user = "root" 'MySQL用戶名
passwd = "123456" 'MySQL密碼
url = "jdbc:mysql://localhost:3306/test?useSSL=false" 'MySQL連接URL
'獲取數(shù)據(jù)庫連接
conn = JDBC.Connect(url,user,passwd,"com.mysql.jdbc.Driver")

步驟三：執(zhí)行SQL語句

'執(zhí)行SQL語句
Dim sql As String
sql = "SELECT * FROM user"
'獲取Statement對象
stmt = conn.ExecQuery(sql)
'遍歷結(jié)果集
Do While stmt.NextRow
'獲取每個字段的值
Dim id As String
Dim name As String
Dim age As String
id = stmt.GetString("id")
name = stmt.GetString("name")
age = stmt.GetString("age")
'處理數(shù)據(jù)
ToastMessageShow(id & "-" & name & "-" & age,True)
Loop

通過上述步驟，我們就可以使用e4a連接MySQL數(shù)據(jù)庫進(jìn)行數(shù)據(jù)操作了。注意，在連接MySQL數(shù)據(jù)庫時需要提前安裝MySQL驅(qū)動包，否則無法連接成功。