VBA Mysql 类

Option Explicit

'==================================== 声明属性 =================================Private Con As ADODB.Connection

' ====================================声明事件===================================

'==================================== 初始化 类 ===================================

Private Sub Class_Initialize()

Set Con = New ADODB.Connection

Con.CursorLocation = adUseClient '设置此项才可获取 recordset.RecordCount

Con.ConnectionString = "Driver={MySQL ODBC 5.2 ANSI Driver};" + _

"Server=sc;" + _

"DB=oa;" + _

"UID=UID;" + _

"PWD=PWD;" + _

"OPTION=3;" + _

"Stmt=Set Names 'UTF-8';"

End Sub

'=================================== 以“属性”的形式对 私有变量 读取、赋值 ====================================

'=================================== 公有方法 ====================================

'关闭连接

Public Sub closeConnection()

Con.Close

Set Con = Nothing

End Sub

'检测是否连接成功

Public Sub checkConnection()

Con.Open

If Con.State = adStateOpen Then

MsgBox "链接状态：" & Con.State & vbCrLf & "ADO版本：" & Con.Version, vbInformation, ""

End If

closeConnection '关闭连接

End Sub

'将查询得到的记录显示到指定 单元格

Public Sub recordToCell(sqlStr As String, wBook, wSheet, firstCell As String)

Dim thisRec As ADODB.Recordset

'查询记录

Set thisRec = selectRecord(sqlStr)

'写入到指定 单元格

Workbooks(wBook).Sheets(wSheet).Range(firstCell).CopyFromRecordset thisRec

closeConnection '关闭连接

End Sub

'============= 数据库 “插、查、改、删” ==============

'“删除”用“更改”[标记删除]实现）

'①“插入”一条记录（返回值：1成功，-1已有相同值，0失败）

'db 数据库名

'fieldArray 字段名 数组

'valueArray 字段值 数组

'checkField 用于检查是否已有相同记录的 字段名（field1,field2,……）

Public Function inertRecord(db As String, fieldArray, valueArray, checkField As String) As Integer

'检查是否已有相应记录

Dim insertRow As Integer

Dim rec As ADODB.Recordset

Dim checkFV, fieldValue, insertSql As String

' MsgBox TypeName(fieldArray)

checkFV = Join(fieldAndValue(fieldArray, valueArray, checkField), " AND ")

fieldValue = Join(fieldAndValue(fieldArray, valueArray), ",")

Set rec = selectRecord(db, "id", checkFV)

If rec.RecordCount

insertSql = "INSERT INTO `" & db & "` SET " & fieldValue

Con.Execute insertSql, insertRow, adCmdText

inertRecord = IIf(insertRow = 1, 1, 0)

Else

inertRecord = -1

End If

Set rec = Nothing

End Function

'②按条件“查询”记录（返回值：ADODB.Recordset对象）

'db 数据库名

'fields 要查询的字段名（field1,field2,……）

'where 查询条件（`field1`='value1' AND|OR `field2`='value2' AND|OR ……）

'sortFields 排序工序（field1,field2[DESC],……）

'limit 要查询的记录数（100 或 20,100）

Public Function selectRecord(db As String, Optional fields = "*", _

Optional where = "", Optional sortFields = "", Optional limit = "") As ADODB.Recordset

Dim sqlStr As String

sqlStr = "SELECT " & fields & " FROM `" & db & "`"

If where "" Then sqlStr = sqlStr & " WHERE " & where

If sortFields "" Then sqlStr = sqlStr & " ORDER BY '" & sortFields & "'"

If limit "" Then sqlStr = sqlStr & " LIMIT " & limit

' MsgBox sqlStr

Set selectRecord = allSql(sqlStr) '总查询 (执行sql语句方法)

End Function

'③“更改”符合指定条件的记录的指定字段（返回受影响的行数）

'db 数据库名

'fieldArray 字段名 数组

'valueArray 字段值 数组

'where 条件（`field1`='value1' AND|OR `field2`='value2' AND|OR ……）

Public Function updateRecord(db As String, fieldArray, valueArray, where As String) As Integer

Dim updateRows As Integer

Dim updateSql, fieldValue As String

fieldValue = Join(fieldAndValue(fieldArray, valueArray), ",")

If fieldValue "" Then

updateSql = "UPDATE `" & db & "` SET " & fieldValue & " WHERE " & where

Con.Open

Con.Execute updateSql, updateRows, adCmdText

updateRecord = IIf(updateRows 0, updateRows, 0)

End If

End Function

'总查询 (执行sql语句方法)

Public Function allSql(sqlStr) As ADODB.Recordset

Dim iRowscount As Long

Con.Open

Set allSql = Con.Execute(sqlStr, iRowscount, adCmdText)

End Function

'=================================== 私有方法 ====================================

'将 fieldArray、valueArray 连接成 `field`='value'（Array）并返回 “数组”

'（若 onlyField 不为空，则只连接包含其内元素的 field）

Private Function fieldAndValue(fieldArray, valueArray, Optional onlyField = "")

Dim i, s As Integer

Dim fj_onlyField(), fvArray()

' MsgBox fieldArray(0)

For i = 0 To UBound(fieldArray)

If fieldArray(i) "" Then

If onlyField = "" Then

ReDim Preserve fvArray(i)

fvArray(i) = "`" & fieldArray(i) & "`='" & valueArray(i) & "'"

Else

If InStr(onlyField, ",") > 0 Then

fj_onlyField = Split(onlyField, ",")

If checkArrayValue(fj_onlyField, fieldArray(i)) = True Then

ReDim Preserve fvArray(s)

fvArray(s) = "`" & fieldArray(i) & "`='" & valueArray(i) & "'"

s = s + 1

End If

Else

If onlyField = fieldArray(i) Then

ReDim Preserve fvArray(0)

fvArray(0) = "`" & fieldArray(i) & "`='" & valueArray(i) & "'"

Exit For

End If

End If

End If

End If

Next i

fieldAndValue = fvArray

End Function

'检测数组中是否包含有＝指定值的元素

Private Function checkArrayValue(arr, theValue) As Boolean

Dim i As Integer

checkArrayValue = False

For i = 0 To UBound(arr)

If arr(i) = theValue Then

checkArrayValue = True

Exit For

End If

Next i

End Function

'将 html实体 转换成正常字符(可用)

Private Function htmlDecodes(str As String) As String

If str = "" Then

htmlDecodes = ""

Else

str = Replace(str, "<", "<")

str = Replace(str, ">", ">")

str = Replace(str, "&", "&")

str = Replace(str, """, Chr(34))

str = Replace(str, ">", Chr(39))

htmlDecodes = str

End If

End Function