colin4k
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herman_liu76：
我们的action中不写逻辑，只处理http有关的数据准备与返 ...
有没有人在struts2的action这一层做事务控制？ -
xiaoxin5230：
呵呵，沙市小吃我觉得是最好吃的，物美价廉
沙市美食-过早篇 -
Durian：
面向数据库设计不能使用oo的全部特性。
ER Studio从设计模型生成JPA Entity -
xiaofengtoo：
我比较喜欢楼主的想法。对于老板与客户不关注那么多，能快速开发， ...
ER Studio从设计模型生成JPA Entity -
魔力猫咪：
ER的模型是数据库模型不是对象模型。
ER Studio从设计模型生成JPA Entity
主要是参考ER Studio设计模型 代码生成 。脚本如下：
ER Studio的模型难道就不是对象？难道必须写成JAVA Class才是对象？
'利用ER/Studio的Macro生成JPA Entity
'目前对于多对多关联和复合主键的支持还没有完成
'By Colin 2009/3/24
Sub Main()
Dim fso As Object
Dim entNames As Variant
Dim entCount As Variant
Dim entLoop As Integer
'ER/Studio variables
Dim mdl As Model
Dim subMdl As SubModel
Dim ent As Entity
Dim classPath As Variant
classPath = "d:\entity\"
Set mdl = DiagramManager.ActiveDiagram.ActiveModel
Set subMdl = mdl.ActiveSubModel
'get the entities list & count
subMdl.EntityNames(entNames, entCount)
'sort the entities by name(alphabetic sort)
Call dhQuickSort(entNames)
For entLoop = 0 To entCount - 1
Set ent = mdl.Entities.Item(entNames(entLoop))
Set fso = CreateObject("Scripting.FileSystemObject")
'DAO class file
Set csFile = fso.CreateTextFile(classPath & AttributeName(StrConv(ent.EntityName,vbLowerCase)) & ".java", True)
Call WriteEntity(csFile, ent, subMdl.Name)
csFile.Close
Next
End Sub
Sub WriteEntity(csFile As Object,ent As Entity, subModelName As String)
Dim content As String
'DAO class
Call Write2File(csFile, NamespaceStart(ent.EntityName, subModelName))
content = content & vbTab & "/// <summary>" & vbCrLf
content = content & vbTab & "/// Data Access Object for " & ent.EntityName & vbCrLf
content = content & vbTab & "/// </summary>" & vbCrLf
content = content & vbTab & "@Entity" & vbCrLf
content = content & vbTab & "@Table(name = """ & ent.TableName & """, catalog = ""wcs_db"", uniqueConstraints = {})" & vbCrLf
content = content & vbTab & "public class " & AttributeName(StrConv(ent.EntityName,vbLowerCase)) & " extends BaseEntity" & vbCrLf
content = content & vbTab & "{" & vbCrLf
content = content & EntityPrivateDeclare(ent) & vbCrLf
content = content & vbTab & vbTab & "/// <summary>" & vbCrLf
content = content & vbTab & vbTab & "/// default constructor for " & ent.EntityName & vbCrLf
content = content & vbTab & vbTab & "/// </summary>" & vbCrLf
content = content & vbTab & vbTab & "public " & AttributeName(StrConv(ent.EntityName,vbLowerCase)) & "()" & vbCrLf
content = content & vbTab & vbTab & "{" & vbCrLf
content = content & vbTab & vbTab & "}" & vbCrLf & vbCrLf
content = content & EntityPublicDeclare(ent)
content = content & EntityOverrideMethod(ent)
content = content & vbTab & "}"
Call Write2File(csFile, content)
End Sub
Function DataType2ClassType(attr As AttributeObj)
'return the .net data type corresponding to the sql type
Dim classType As String
Select Case attr.Datatype
Case "CHAR"
classType = "String"
Case "VARCHAR2"
classType = "String"
Case "NVARCHAR"
classType = "String"
Case "NVARCHAR2"
classType = "String"
Case "VARCHAR"
classType = "String"
Case "NTEXT"
classType = "String"
Case "DATETIME"
classType = "Date"
Case "DATE"
classType = "Date"
Case "DECIMAL"
classType = "java.math.BigDecimal"
Case "FLOAT"
classType = "Float"
Case "NUMERIC"
If attr.DataScale = 0 Then
If attr.DataLength > 9 Then
classType = "java.math.BigDecimal"
Else
classType = "Integer"
End If
Else
If attr.DataScale < 29 Then
classType = "java.math.BigDecimal"
Else
classType = "Double"
End If
End If
Case "INTEGER"
classType = "Integer"
Case "BIGINT"
classType = "Long"
Case "BIT"
classType = "Boolean"
Case Else
classType = "String"
End Select
DataType2ClassType = classType
End Function
Function AttributePrivateName(entName As String)
Dim length As Integer
Dim result As String
length = Len(entName)
If length >0 Then
result = StrConv(Left$(entName,1),vbLowerCase) & Right$(entName,length-1)
End If
AttributePrivateName = result
End Function
Function AttributeName(entName As String)
Dim result As String
Dim t As Integer
Dim tempStr As String
Dim length As Integer
length = Len(entName)
entName = StrConv(Left$(entName,1),vbUpperCase) & Right$(entName,length-1)
t=InStr(1,entName,"_")
If t > 0 Then
tempStr = Right$(entName,length - t)
length = Len(tempStr)
tempStr = StrConv(Left$(tempStr,1),vbUpperCase) & Right$(tempStr,length-1)
result = result & Left$(entName,t-1) & tempStr
Else
result = entName
End If
Do While t>0
length = Len(result)
t=InStr(1,result,"_")
tempStr = Right$(result,length-t)
length = Len(tempStr)
tempStr = StrConv(Left$(tempStr,1),vbUpperCase) & Right$(tempStr,length-1)
If t>0 Then
result = Left$(result,t-1) & tempStr
End If
Loop
AttributeName = result
End Function
Function EntityPrivateDeclare(ent As Entity)
Dim result As String
Dim attr As AttributeObj
Dim Index As Integer
Dim parent As Entity
Dim child As Entity
Dim rl As Relationship
Dim prl As Relationship
For Index=1 To ent.Attributes.Count
Set attr=FindAttribute(ent.Attributes, Index)
If Not attr Is Nothing Then
If attr.PrimaryKey Then
result=result & vbTab & vbTab & "private " & DataType2ClassType(attr) & " id;" & vbCrLf
Else
If attr.ForeignKey Then
'Set parent = attr.GetParent()
'result=result & vbTab & vbTab & "private " & AttributeName(StrConv((parent.EntityName),vbLowerCase)) & " " & AttributePrivateName(AttributeName(StrConv((parent.EntityName),vbLowerCase))) & ";" & vbCrLf
Else
result=result & vbTab & vbTab & "private " & DataType2ClassType(attr) & " " & AttributePrivateName(AttributeName(StrConv(attr.AttributeName,vbLowerCase))) & ";" & vbCrLf
End If
End If
End If
Next
For Each rl In ent.ChildRelationships
Set parent = rl.ParentEntity
result=result & vbTab & vbTab & "private " & AttributeName(StrConv((parent.EntityName),vbLowerCase)) & " " & AttributePrivateName(AttributeName(StrConv((parent.EntityName),vbLowerCase))) & ";" & vbCrLf
Next
For Each prl In ent.ParentRelationships
Set child = prl.ChildEntity
result=result & vbTab & vbTab & "private Set<" & AttributeName(StrConv((child.EntityName),vbLowerCase)) & "> " & AttributePrivateName(AttributeName(StrConv((child.EntityName),vbLowerCase))) & "s = new HashSet<" & AttributeName(StrConv((child.EntityName),vbLowerCase)) & ">();" & vbCrLf
Next
EntityPrivateDeclare=result
End Function
Function EntityPublicDeclare(ent As Entity)
Dim result As String
Dim attr As AttributeObj
Dim Index As Integer
Dim parent As Entity
Dim rl As Relationship
Dim fk As FKColumnPair
Dim keyID As String
Dim child As Entity
Dim prl As Relationship
For Index=1 To ent.Attributes.Count
Set attr = FindAttribute(ent.Attributes, Index)
If Not attr Is Nothing Then
'result = result & vbTab & vbTab & "private " & DataType2ClassType(attr) & " " & attr.AttributeName & ";" & vbCrLf
If attr.PrimaryKey Then
result = result & vbTab & vbTab & "/// <summary>" & vbCrLf
result = result & vbTab & vbTab & "/// " & attr.AttributeName & vbCrLf
result = result & vbTab & vbTab & "/// </summary>" & vbCrLf
result = result & AnnotationColumn(attr)
result = result & vbTab & vbTab & "@Override" & vbCrLf
result = result & vbTab & vbTab & "public " & DataType2ClassType(attr) & " getId(){" & vbCrLf
result = result & vbTab & vbTab & vbTab & "return this.id;" & vbCrLf
result = result & vbTab & vbTab & "}" & vbCrLf
result = result & vbTab & vbTab & vbCrLf
result = result & vbTab & vbTab & "@Override" & vbCrLf
result = result & vbTab & vbTab & "public void setId(" & DataType2ClassType(attr) & " id){" & vbCrLf
result = result & vbTab & vbTab & vbTab & "this.id = id;" & vbCrLf
result = result & vbTab & vbTab & "}" & vbCrLf
result = result & vbTab & vbTab & vbCrLf
Else
If attr.ForeignKey Then
Else
result = result & vbTab & vbTab & "/// <summary>" & vbCrLf
result = result & vbTab & vbTab & "/// " & attr.AttributeName & vbCrLf
result = result & vbTab & vbTab & "/// </summary>" & vbCrLf
result = result & AnnotationColumn(attr)
result = result & vbTab & vbTab & "public " & DataType2ClassType(attr) & " " & atrributeGetMethod(attr.ColumnName) & "(){" & vbCrLf
result = result & vbTab & vbTab & vbTab & "return this." & AttributePrivateName(AttributeName(StrConv(attr.AttributeName,vbLowerCase))) & ";" & vbCrLf
result = result & vbTab & vbTab & "}" & vbCrLf
result = result & vbTab & vbTab & vbCrLf
result = result & vbTab & vbTab & "public void " & atrributeSetMethod(attr.ColumnName) & "(" & DataType2ClassType(attr) & " " & AttributePrivateName(AttributeName(StrConv(attr.AttributeName,vbLowerCase))) & "){" & vbCrLf
result = result & vbTab & vbTab & vbTab & "this." & AttributePrivateName(AttributeName(StrConv(attr.AttributeName,vbLowerCase))) & " = " & AttributePrivateName(AttributeName(StrConv(attr.AttributeName,vbLowerCase))) & ";" & vbCrLf
result = result & vbTab & vbTab & "}" & vbCrLf
result = result & vbTab & vbTab & vbCrLf
End If
End If
End If
Next
For Each rl In ent.ChildRelationships
Set parent = rl.ParentEntity
If Not parent Is Nothing Then
'result = result & vbTab & vbTab & "/// <summary>" & vbCrLf
'result = result & vbTab & vbTab & "/// " & attr.AttributeName & vbCrLf
'result = result & vbTab & vbTab & "/// </summary>" & vbCrLf
'result = result & AnnotationColumn(attr)
For Each fk In rl.FKColumnPairs
keyID = fk.ParentAttribute.AttributeName
Next
result = result & AnnotationFK(parent,keyID)
'result=result & vbTab & vbTab & "private " & AttributeName(StrConv((parent.EntityName),vbLowerCase)) & " " & AttributePrivateName(AttributeName(StrConv((parent.EntityName),vbLowerCase))) & ";" & vbCrLf
result = result & vbTab & vbTab & "public " & AttributeName(StrConv(parent.EntityName,vbLowerCase)) & " " & atrributeGetMethod(parent.EntityName) & "(){" & vbCrLf
result = result & vbTab & vbTab & vbTab & "return this." & AttributePrivateName(AttributeName(StrConv((parent.EntityName),vbLowerCase))) & ";" & vbCrLf
result = result & vbTab & vbTab & "}" & vbCrLf
result = result & vbTab & vbTab & vbCrLf
result = result & vbTab & vbTab & "public void " & atrributeSetMethod(parent.EntityName) & "(" & AttributeName(StrConv((parent.EntityName),vbLowerCase)) & " " & AttributePrivateName(AttributeName(StrConv(parent.EntityName,vbLowerCase))) & "){" & vbCrLf
result = result & vbTab & vbTab & vbTab & "this." & AttributePrivateName(AttributeName(StrConv(parent.EntityName,vbLowerCase))) & " = " & AttributePrivateName(AttributeName(StrConv(parent.EntityName,vbLowerCase))) & ";" & vbCrLf
result = result & vbTab & vbTab & "}" & vbCrLf
result = result & vbTab & vbTab & vbCrLf
End If
Next
For Each prl In ent.ParentRelationships
Set child = prl.ChildEntity
If Not child Is Nothing Then
result = result & AnnotationChild(ent)
result = result & vbTab & vbTab & "public Set<" & AttributeName(StrConv(child.EntityName,vbLowerCase)) & "> " & atrributeGetMethod(child.EntityName) & "s(){" & vbCrLf
result = result & vbTab & vbTab & vbTab & "return this." & AttributePrivateName(AttributeName(StrConv((child.EntityName & "s"),vbLowerCase))) & ";" & vbCrLf
result = result & vbTab & vbTab & "}" & vbCrLf
result = result & vbTab & vbTab & vbCrLf
result = result & vbTab & vbTab & "public void " & atrributeSetMethod(child.EntityName & "s") & "(Set<" & AttributeName(StrConv((child.EntityName),vbLowerCase)) & "> " & AttributePrivateName(AttributeName(StrConv(child.EntityName,vbLowerCase))) & "s){" & vbCrLf
result = result & vbTab & vbTab & vbTab & "this." & AttributePrivateName(AttributeName(StrConv(child.EntityName,vbLowerCase))) & "s = " & AttributePrivateName(AttributeName(StrConv(child.EntityName,vbLowerCase))) & "s;" & vbCrLf
result = result & vbTab & vbTab & "}" & vbCrLf
result = result & vbTab & vbTab & vbCrLf
End If
Next
EntityPublicDeclare=result
End Function
Function atrributeGetMethod(attr As String)
atrributeGetMethod = "get" & AttributeName(StrConv(attr,vbLowerCase))
End Function
Function atrributeSetMethod(attr As String)
atrributeSetMethod = "set" & AttributeName(StrConv(attr,vbLowerCase))
End Function
Function AppendToString(attr As AttributeObj, Val As String)
Dim result As String
result=Val
If Len(Val)>0 Then
result = result & "id.toString()"
Else
result = "id.toString()"
End If
AppendToString=result
End Function
Function AppendGetHashCode(attr As AttributeObj, Val As String)
Dim result As String
result=Val
If Len(Val)>0 Then
result = result & " + " & "id.hashCode()"
Else
result ="id.hashCode()"
End If
AppendGetHashCode=result
End Function
Function AppendEquals(ent As Entity, attr As AttributeObj, Val As String)
Dim result As String
result=Val
If Len(Val)>0 Then
result = result & "&& (id) & == (obj instanceof " & AttributeName(StrConv(ent.EntityName,vbLowerCase)) & ")." & AttributeName(StrConv(attr.AttributeName,vbLowerCase)) & ")"
Else
result = "( id == ((" & AttributeName(StrConv(ent.EntityName,vbLowerCase)) & ")obj).getId() )"
End If
AppendEquals=result
End Function
Function EntityOverrideMethod(ent As Entity)
Dim result As String, toString As String, hashCode As String, equals As String
Dim attr As AttributeObj
Dim existsPrimary As Boolean
For Each attr In ent.Attributes
If attr.PrimaryKey Then
toString = AppendToString(attr, toString)
hashCode = AppendGetHashCode(attr, hashCode)
equals = AppendEquals(ent, attr, equals)
existsPrimary=True
End If
Next
If existsPrimary Then
result = result & vbTab & vbTab & "/// <summary>" & vbCrLf
result = result & vbTab & vbTab & "///" & vbCrLf
result = result & vbTab & vbTab & "/// </summary>" & vbCrLf
result = result & vbTab & vbTab & "/// <returns></returns>" & vbCrLf
result = result & vbTab & vbTab & "@Override" & vbCrLf
result = result & vbTab & vbTab & "public String toString()" & vbCrLf
result = result & vbTab & vbTab & "{" & vbCrLf
result = result & vbTab & vbTab & vbTab & "return " & toString & ";" & vbCrLf
result = result & vbTab & vbTab & "}" & vbCrLf
result = result & vbTab & vbTab & "/// <summary>" & vbCrLf
result = result & vbTab & vbTab & "///" & vbCrLf
result = result & vbTab & vbTab & "/// </summary>" & vbCrLf
result = result & vbTab & vbTab & "/// <returns></returns>" & vbCrLf
result = result & vbTab & vbTab & "@Override" & vbCrLf
result = result & vbTab & vbTab & "public int hashCode()" & vbCrLf
result = result & vbTab & vbTab & "{" & vbCrLf
result = result & vbTab & vbTab & vbTab & "return " & hashCode & ";" & vbCrLf
result = result & vbTab & vbTab & "}" & vbCrLf
result = result & vbTab & vbTab & "/// <summary>" & vbCrLf
result = result & vbTab & vbTab & "///" & vbCrLf
result = result & vbTab & vbTab & "/// </summary>" & vbCrLf
result = result & vbTab & vbTab & "/// <returns></returns>" & vbCrLf
result = result & vbTab & vbTab & "@Override" & vbCrLf
result = result & vbTab & vbTab & "public boolean equals(Object obj)" & vbCrLf
result = result & vbTab & vbTab & "{" & vbCrLf
result = result & vbTab & vbTab & vbTab & "boolean result = false;" & vbCrLf
result = result & vbTab & vbTab & vbTab & "if (obj instanceof " & AttributeName(StrConv(ent.EntityName,vbLowerCase)) & ")" & vbCrLf
result = result & vbTab & vbTab & vbTab & "{" & vbCrLf
result = result & vbTab & vbTab & vbTab & vbTab & "result = " & equals & ";" & vbCrLf
result = result & vbTab & vbTab & vbTab & "}" & vbCrLf
result = result & vbTab & vbTab & vbTab & "return result;" & vbCrLf
result = result & vbTab & vbTab & "}" & vbCrLf
End If
EntityOverrideMethod=result
End Function
Function AnnotationColumn(attr As AttributeObj)
Dim result As String
If Not attr Is Nothing Then
If attr.PrimaryKey Then
result = vbTab & vbTab & "@Id" & vbCrLf
result = result & vbTab & vbTab & "@GeneratedValue(strategy = GenerationType.AUTO)" & vbCrLf
End If
If attr.ForeignKey Then
result = vbTab & vbTab & "@ManyToOne(cascade = {CascadeType.PERSIST,CascadeType.MERGE})" &vbCrLf
result = result & vbTab & vbTab & "@JoinColumn(name=""" & attr.ColumnName & """)" & vbCrLf
Else
result = vbTab & vbTab & "@Column(name = """ & attr.ColumnName & """, unique = false, nullable = "
If attr.NullOption = "NULL" Then
result = result & "false"
Else
result = result & "true"
End If
result = result & ", insertable = true, updatable = true, length = " & attr.DataLength & ")" &vbCrLf
End If
End If
AnnotationColumn = result
End Function
Function AnnotationFK(parent As Entity,keyID As String)
Dim result As String
If Not parent Is Nothing Then
result = vbTab & vbTab & "@ManyToOne(cascade = {CascadeType.PERSIST,CascadeType.MERGE})" &vbCrLf
result = result & vbTab & vbTab & "@JoinColumn(name=""" & keyID & """)" & vbCrLf
End If
AnnotationFK = result
End Function
Function AnnotationChild(ent As Entity)
Dim result As String
If Not ent Is Nothing Then
result = vbTab & vbTab & "@OneToMany(mappedBy=""" & AttributePrivateName(AttributeName(StrConv(ent.EntityName,vbLowerCase ))) & """)" &vbCrLf
End If
AnnotationChild = result
End Function
Function NamespaceStart(entName As String, subModelName As String)
Dim result As String
result = "//*******************************************" & vbCrLf
result = result & "// ** Description: Data Access Object for " & entName & vbCrLf
result = result & "// ** Author : Code generator" & vbCrLf
result = result & "// ** Created : " & Now & vbCrLf
result = result & "// ** Modified :" & vbCrLf
result = result & "//*******************************************" & vbCrLf & vbCrLf
result = result & "package apps.demo.entity;" & vbCrLf & vbCrLf
result = result & "import java.util.*;" & vbCrLf
result = result & "import javax.persistence.*;" & vbCrLf
result = result & "import core.hibernate.BaseEntity;" & vbCrLf
NamespaceStart = result
End Function
Function FindAttribute(attrs As Attributes, Index As Integer)
Dim result As AttributeObj
Dim attr As AttributeObj
Set result = Nothing
For Each attr In attrs
If attr.SequenceNumber=Index Then
Set FindAttribute=attr
Exit Function
End If
Next
Set FindAttribute=Nothing
End Function
Sub Write2File(fileObj As Object, wordLine As String)
fileObj.WriteLine (wordLine)
End Sub
Const dhcMissing = -2
'sort the entities by name(alphabetic sort)
Sub dhQuickSort(varArray As Variant, Optional intLeft As Integer = dhcMissing, Optional intRight As Integer = dhcMissing)
Dim i As Integer
Dim j As Integer
Dim varTestVal As Variant
Dim intMid As Integer
If intLeft = dhcMissing Then intLeft = LBound(varArray)
If intRight = dhcMissing Then intRight = UBound(varArray)
If intLeft < intRight Then
intMid = (intLeft + intRight) \ 2
varTestVal = UCase(varArray(intMid))
i = intLeft
j = intRight
Do
Do While UCase(varArray(i)) < varTestVal
i = i + 1
Loop
Do While UCase(varArray(j)) > varTestVal
j = j - 1
Loop
If i <= j Then
SwapElements varArray, i, j
i = i + 1
j = j - 1
End If
Loop Until i > j
If j <= intMid Then
Call dhQuickSort(varArray, intLeft, j)
Call dhQuickSort(varArray, i, intRight)
Else
Call dhQuickSort(varArray, i, intRight)
Call dhQuickSort(varArray, intLeft, j)
End If
End If
End Sub
Private Sub SwapElements(varItems As Variant, intItem1 As Integer, intItem2 As Integer)
Dim varTemp As Variant
varTemp = varItems(intItem2)
varItems(intItem2) = varItems(intItem1)
varItems(intItem1) = varTemp
End Sub
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评论
6 楼
Durian
2009-05-20
面向数据库设计不能使用oo的全部特性。
5 楼
xiaofengtoo
2009-04-13
我比较喜欢楼主的想法。
对于老板与客户不关注那么多，能快速开发，并能实际应用才是最好的东西。
ER的模型设计 可以针对对象的设置，在于怎么使用。
不过这里我有个问题 楼主 ，你能生成出来的文件 是UTF8的文件吗 ？
对于老板与客户不关注那么多，能快速开发，并能实际应用才是最好的东西。
ER的模型设计 可以针对对象的设置，在于怎么使用。
不过这里我有个问题 楼主 ，你能生成出来的文件 是UTF8的文件吗 ？
4 楼
魔力猫咪
2009-03-25
ER的模型是数据库模型不是对象模型。
3 楼
colin4k
2009-03-24
魔力猫咪 写道
不建议使用这种方式。看上去好像方便了，其实是把主次关系搞反了。面向对象设计中对象是核心，不是数据库。如果先设计数据库，然后图省事生成对象，则是面向数据库设计。
ER Studio的模型难道就不是对象？难道必须写成JAVA Class才是对象？
2 楼
kjj
2009-03-24
同意楼上的做法
1 楼
魔力猫咪
2009-03-24
不建议使用这种方式。看上去好像方便了，其实是把主次关系搞反了。面向对象设计中对象是核心，不是数据库。如果先设计数据库，然后图省事生成对象，则是面向数据库设计。
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总结起来，"jpa代码自动生成工具-springboot"是利用JPA和Spring Boot特性，配合特定工具，帮助开发者快速构建包含领域模型、数据访问、业务逻辑和前端控制的完整应用。通过这种方式，开发者可以更专注于业务创新，而...
"Eclipse 生成 JPA 元模型的方法" Eclipse 是一个功能强大且广泛应用的集成开发环境（IDE），它提供了许多实用的功能和插件来帮助开发者快速开发和管理项目。Java 持久化 API（JPA）是 Java 平台上的一种标准化的...
ER元模型创建方法是数据库设计中的一个重要环节，它主要用于构建数据模型，以便更好地理解和组织数据库结构。在本教程中，我们将深入探讨如何创建ER（实体关系）元模型，并将其同步到数据库，确保数据的准确性和一致...
JPA代码生成器 1.生成domain dao ，service， mvc文件 2.对应的框架有JPA,spring MVC ,HIBERNATE 3.默认文件生成目录在D:\CODEGEN,直接修改工程源码即可 4.运行方法：JDBCCodeGenerator ，修改public static void ...
这一过程允许开发者从现有的数据库结构自动生成Java持久化实体类（即JPA实体类），并进一步生成基本的增删查改（CRUD）操作代码，极大地提高了开发效率和减少了手动编码的工作量。 ### 什么是JPA？ Java ...
这个工具可能包含一些预设模板，可以根据数据库模式自动生成实体类（Entity）、映射接口（Mapper Interface）以及对应的 XML 映射文件。然而，由于它需要用户进行部分代码修改才能使用，这意味着生成的代码可能只是...
Java自动生成entity、dao、service、controller代码
springboot jpa 自动生成实体类的 文件 可以拿走直接用 Generate POJOs.groovy
- 通过使用JPA的注解，如`@Entity`（表示这是一个实体类）、`@Table`（指定数据库表名）、`@Id`（标识主键）、`@GeneratedValue`（主键生成策略）等，可以对JavaBean进行更精细的配置。 5. **使用生成的JavaBean**...
本压缩包文件"04_JPA详解_第一个JPA实例与JPA主键生成策略.zip"包含了关于如何在实际项目中运用JPA，以及理解JPA主键生成策略的详细教程。 ### JPA基础 1. **JPA简介**: JPA是Java EE的一部分，它提供了一套规范，...
通过以上步骤，你就成功地搭建了JPA环境，并理解了如何创建JPA实体和设置主键生成策略。继续深入学习，你将能够利用JPA的强大功能，如查询语言(JPQL)、级联操作、事务管理等，来更高效地进行数据库操作。
本文将详细介绍如何通过一个简单的员工数据模型来创建、配置、调用并部署一个 SAP JPA 1.0 实体。我们的示例应用仅包含一个实体——“Employee”。该实体允许您执行以下操作：创建新员工、根据唯一标识符查找现有...
当Spring Boot应用启动时，JPA会自动扫描`@Entity`类并根据它们生成对应的数据库表。如果表已存在且与实体类匹配，则不会进行更改。如果表不存在，JPA将根据实体类创建表。 6. **使用Repository** 一旦表创建完成...
数据库 快速生成JPA表对象 脚本
它提供了一种方式，让开发者可以用面向对象的编程模型来操作数据库，而无需直接编写SQL语句。JPA允许你在Java应用程序中以对象的形式处理数据，这些对象可以自动转换为数据库中的记录。 在JPA的例子中，我们通常会...
4. 使用Spring Data JPA的@Entity注解定义Java实体类，对应数据库表结构。 5. 创建一个Repository接口，继承JpaRepository，IDEA会自动生成对应的数据访问方法。 6. 如果数据库已存在，可以使用IDEA的逆向工程工具，...