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joystudy.mer
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<?xml version="1.0" encoding="UTF-8"?>
<ERDiagram version="1.1">
<Connection session="JoyStudy" database="joystudy" />
<Drawing gridVisible="false" snapOn="false" fastRouting="false" labelsVisible="true" />
<Tables>
<Table name="coursetb">
<Drawing expanded="true" location="359,43" dimensions="168,86" />
<Columns>
<Column name="csID" primary_key="true" foreign_key="false" required="true" unique="true">
<Data type="int" size="10" />
</Column>
<Column name="csName" primary_key="false" foreign_key="false" required="true" unique="true">
<Data type="varchar" size="50" />
</Column>
<Column name="csTeacher" primary_key="false" foreign_key="true" required="true" unique="false">
<Data type="int" size="10" />
</Column>
</Columns>
</Table>
<Table name="enrollmenttb">
<Drawing expanded="true" location="61,81" dimensions="165,105" />
<Columns>
<Column name="enID" primary_key="true" foreign_key="false" required="true" unique="true">
<Data type="int" size="10" />
</Column>
<Column name="enUserID" primary_key="false" foreign_key="true" required="true" unique="false">
<Data type="int" size="10" />
</Column>
<Column name="enCourseID" primary_key="false" foreign_key="true" required="true" unique="false">
<Data type="int" size="10" />
</Column>
<Column name="enGrade" primary_key="false" foreign_key="false" required="false" unique="false">
<Data type="bigint" size="19" />
</Column>
</Columns>
</Table>
<Table name="messagetb">
<Drawing expanded="true" location="636,86" dimensions="179,125" />
<Columns>
<Column name="mgID" primary_key="true" foreign_key="false" required="true" unique="true">
<Data type="int" size="10" />
</Column>
<Column name="userID" primary_key="false" foreign_key="true" required="true" unique="false">
<Data type="int" size="10" />
</Column>
<Column name="courseID" primary_key="false" foreign_key="true" required="true" unique="false">
<Data type="int" size="10" />
</Column>
<Column name="mgTitle" primary_key="false" foreign_key="false" required="true" unique="false">
<Data type="varchar" size="100" />
</Column>
<Column name="mgContent" primary_key="false" foreign_key="false" required="true" unique="false">
<Data type="varchar" size="500" />
</Column>
</Columns>
</Table>
<Table name="usertb">
<Drawing expanded="true" location="359,272" dimensions="167,167" />
<Columns>
<Column name="uID" primary_key="true" foreign_key="false" required="true" unique="true">
<Data type="int" size="10" />
</Column>
<Column name="username" primary_key="false" foreign_key="false" required="true" unique="true">
<Data type="varchar" size="30" />
</Column>
<Column name="password" primary_key="false" foreign_key="false" required="true" unique="false">
<Data type="varchar" size="30" />
</Column>
<Column name="realName" primary_key="false" foreign_key="false" required="true" unique="false">
<Data type="varchar" size="30" />
</Column>
<Column name="Email" primary_key="false" foreign_key="false" required="true" unique="false">
<Data type="varchar" size="50" />
</Column>
<Column name="sex" primary_key="false" foreign_key="false" required="true" unique="false">
<Data type="char" size="2" />
</Column>
<Column name="Type" primary_key="false" foreign_key="false" required="true" unique="false">
<Data type="BIT" />
</Column>
</Columns>
</Table>
</Tables>
<Relationships>
<Relationship name="courseTeacher">
<Details primary_table="usertb" foreign_table="coursetb">
<PrimaryKeys>
<ColumnName name="uID" />
</PrimaryKeys>
<ForeignKeys>
<ColumnName name="csTeacher" />
</ForeignKeys>
</Details>
<Drawing routingType="0" />
</Relationship>
<Relationship name="enCourse">
<Details primary_table="coursetb" foreign_table="enrollmenttb">
<PrimaryKeys>
<ColumnName name="csID" />
</PrimaryKeys>
<ForeignKeys>
<ColumnName name="enCourseID" />
</ForeignKeys>
</Details>
<Drawing routingType="0" />
</Relationship>
<Relationship name="enUser">
<Details primary_table="usertb" foreign_table="enrollmenttb">
<PrimaryKeys>
<ColumnName name="uID" />
</PrimaryKeys>
<ForeignKeys>
<ColumnName name="enUserID" />
</ForeignKeys>
</Details>
<Drawing routingType="0" />
</Relationship>
<Relationship name="msgCourse">
<Details primary_table="coursetb" foreign_table="messagetb">
<PrimaryKeys>
<ColumnName name="csID" />
</PrimaryKeys>
<ForeignKeys>
<ColumnName name="courseID" />
</ForeignKeys>
</Details>
<Drawing routingType="0" />
</Relationship>
<Relationship name="msgUser">
<Details primary_table="usertb" foreign_table="messagetb">
<PrimaryKeys>
<ColumnName name="uID" />
</PrimaryKeys>
<ForeignKeys>
<ColumnName name="userID" />
</ForeignKeys>
</Details>
<Drawing routingType="0" />
</Relationship>
</Relationships>
</ERDiagram>