用黑莓JDE安裝SqLite

Question

我安裝了黑莓JDE和Eclipse。我想爲我的應用程序創建一個SqLite數據庫。我應該單獨安裝SqLite還是附帶BlackBerry JDE？

Answer 1

對於sqlite數據庫，沒有什麼可以單獨安裝的。您必須以編程方式創建它，並且必須使用它。用這個。

創建在SD卡數據庫：

Public void CreateDatabase() 
{ 
Database d; 

try 
{ 
URI myURI = URI.create("file:///SDCard/Databases/" +"Test.db"); 
d = DatabaseFactory.create(myURI); 
d.close(); 
add(new RichTextField("DB created successfully")); 
} 
catch (Exception e) 
{ 
System.out.println(e.getMessage()); 
e.printStackTrace(); 
add(new RichTextField("Error: "+e.toString())); 
} 
} 

在數據庫中創建表：

Public void CreateTable() 
{ 
Database d; 
try 
{ 
URI myURI = URI.create("file:///SDCard/Databases/"+"Test.db"); 
d = DatabaseFactory.open(myURI); 
Statement st = d.createStatement("CREATE TABLE 'testtable' (" +"'id' INTEGER, " +"'name' TEXT "); 

st.prepare(); 
st.execute(); 
st.close(); 
d.close(); 
add(new RichTextField("Table created successfully")); 
} 
catch (Exception e) 
{ 
System.out.println(e.getMessage()); 
e.printStackTrace(); 
add(new RichTextField("Error: "+e.toString())); 
} 

} 

插入數據的表：

Public void InsertData() 
{ 
Database d; 
try 
{ 
URI myURI = URI.create("file:///SDCard/Databases/" +"Test.db"); 
d = DatabaseFactory.open(myURI); 

Statement st = d.createStatement("INSERT INTO testtable(id,name) " + "VALUES (1,’Arun’)"); 
st.prepare(); 
st.execute(); 
st.close(); 
d.close(); 
add(new RichTextField("Values Inserted")); 
} 
catch (Exception e) 
{ 
System.out.println(e.getMessage()); 
e.printStackTrace(); 
add(new RichTextField("Error: "+e.toString())); 
} 

} 

從數據庫個

檢索值：

Public void RetriveValues() 
{ 
Database d; 

try 
{ 
URI myURI = URI.create("file:///SDCard/Databases/" +"Test.db"); 
d = DatabaseFactory.open(myURI); 
Statement st = d.createStatement("SELECT id,name FROM testtable"); 
st.prepare(); 
net.rim.device.api.database.Cursor c = st.getCursor(); 

Row r; 
int i = 0; 
while(c.next()) 
{ 
r = c.getRow(); 
i++; 
add(new RichTextField(i + ". ID = " + r.getInteger(0) 
+ " , " 
+". Name = " + r.getString(1))); 
} 
if (i==0) 
{ 
add(new RichTextField("No data in the table.")); 
} 
st.close(); 
d.close(); 
} 
catch (Exception e) 
{ 
System.out.println(e.getMessage()); 
e.printStackTrace(); 
add(new RichTextField("Error: "+e.toString())); 
} 
}