spring3.1.1+mybatis3.1.1, delete, check, change and paging and transaction management _java

1. [Code]mybatis Global configuration file

<plugins>
< Plugin interceptor = "Com.has.core.page.PaginationInterceptor"/>
</plugins>

2. [Document] Paginationinterceptor.java

@Intercepts ({@Signature (type = Statementhandler. Class, method = "Prepare", args = {Connection. class})}) Class Paginationinterceptor implements Interceptor {@Override public Object intercept (invocation invocation) throws Thro
wable {Statementhandler Statementhandler = (statementhandler) invocation.gettarget ();
Boundsql boundsql = Statementhandler.getboundsql ();
MetaObject Metastatementhandler = Metaobject.forobject (Statementhandler);
Rowbounds rowbounds = (rowbounds) metastatementhandler.getvalue ("Delegate.rowbounds");
if (rowbounds = null | | rowbounds = = rowbounds.default) {return invocation.proceed ();}
Configuration Configuration = (Configuration) metastatementhandler.getvalue ("Delegate.configuration");
Dialect.type databasetype = null; try {databasetype = Dialect.Type.valueOf (Configuration.getvariables (). GetProperty ("dialect"). toUpperCase ()); catch (Exception e) {} if (DatabaseType = = null) {throw new RuntimeException ("The value of the dialect propErty in Configuration.xml are not defined: "+ configuration.getvariables (). GetProperty (" dialect "));
Dialect dialect = null; Switch (databasetype) {case mysql:dialect = new Mysql5dialect (), break, Case oracle:dialect = new Oracledialect (); Bre
AK;
String originalsql = (string) metastatementhandler.getvalue ("Delegate.boundSql.sql"); Metastatementhandler.setvalue ("Delegate.boundSql.sql", Dialect.getlimitstring (Originalsql, Rowbounds.getoffset ()
, Rowbounds.getlimit ()));
Metastatementhandler.setvalue ("Delegate.rowBounds.offset", Rowbounds.no_row_offset);
Metastatementhandler.setvalue ("Delegate.rowBounds.limit", rowbounds.no_row_limit);
return Invocation.proceed (); @Override public Object Plugin (object target) {return Plugin.wrap (target, this);} @Override public void SetProperties (Properties Properties) {
}
}

3. [Document] Dialect.java

/**
* Database dialect definition
*/public
abstract class Dialect {public
static enum Type {
MYSQL, ORACLE
} Public
Abstract String getlimitstring (String sql, int skipresults, int maxresults);

4. [Document] Mysql5dialect.java

/**
* MySQL dialect pagination class */public
class Mysql5dialect extends dialect {
protected static final String Sql_ End_delimiter = ";";
public string getlimitstring (String sql, Boolean Hasoffset) {return
mysql5pagehepler.getlimitstring (SQL,-1,-1) ;
}
public string getlimitstring (string sql, int offset, int limit) {return
mysql5pagehepler.getlimitstring sql, offset, limit);
}
public Boolean supportslimit () {return
true;
}
}

5. [Document] Oracledialect.java

Package com.chyjr.has.core.page.dialect;
/**
* Oracel dialect Paging
* 
/Public
class Oracledialect extends dialect {public
String getlimitstring ( String sql, int offset, int limit) {
//TODO does not implement return
' ";
}
}

6. [Document] Mysql5pagehepler.java

Import Java.util.regex.Matcher;
Import Java.util.regex.Pattern; /** * MySQL Paging tool class/public class Mysql5pagehepler {/** * SQL/public static string getcountstring for total queries (String Queryse lect) {queryselect = Getlinesql (queryselect); int orderindex = Getlastorderinsertpoint (queryselect); int formIndex = GetA
Fterforminsertpoint (Queryselect);
String select = Queryselect.substring (0, Formindex); If the select contains DISTINCT, only the outer layer contains count if (Select.tolowercase (). IndexOf ("select DISTINCT")!=-1 | | queryselect.tolowerc ASE (). IndexOf ("GROUP BY")!=-1} {return to New StringBuffer (Queryselect.length ()). Append ("SELECT COUNT (1) Count from ( "). Append (queryselect.substring (0, Orderindex)). Append (") T "). ToString (); else {return new StringBuffer (Queryselect.length ()). Append ("SELECT COUNT (1) Count"). Append (Queryselect.substring (
Formindex, Orderindex)). ToString (); }/** * Gets the insertion point position of the last order by * @return Returns the position of the last order by insertion point/private static int Getlastorderinsertpoint (String queryselect) {int orderindex = Queryselect.tolowercase (). LastIndexOf ("ORDER by"); if (Orderindex = 1 | |!isbracketcanpar Tnership (Queryselect.substring (Orderindex, Queryselect.length ())) {throw new RuntimeException ("My SQL paging must have an order by
Statement! ");
return orderindex;  /** * Get Paged SQL * * @param offset * offset * @param limit * position * @return Paging SQL/public static string getlimitstring (String queryselect, int offset, int limit) {Queryselect = Getlinesql (queryselect);//String sql = Queryselect.replaceall ("[^\\
s,]+\\. "," "") + "limit" +//Offset + "," + limit;
String sql = queryselect + "Limit" + offset + "," + limit;
return SQL; /** * Transforms the SQL statement into a statement, and each word is separated by 1 spaces * * @param SQL * SQL statement * @return If SQL is null return NULL, return converted SQL/private static String G
Etlinesql (String sql) {return sql.replaceall ("[\ r \ n]", ""). ReplaceAll ("\\s{2,}", "");} /** * Gets the insertion point of the first correct from of SQL * * private static int getafterforminsertpoint (string queryselect) {string regex = "\\s+from\\s
+" ; Pattern PatTern = Pattern.compile (regex, pattern.case_insensitive);
Matcher Matcher = Pattern.matcher (Queryselect);
while (Matcher.find ()) {int fromstartindex = Matcher.start (0);
String Text = queryselect.substring (0, Fromstartindex);
if (isbracketcanpartnership (text)) {return Fromstartindex}}
return 0; /** * Determines whether the bracket "()" matches, and does not determine whether the order is correct * * @param text * To be judged @return if the match returns TRUE, return False/private static Boolean Isbra Cketcanpartnership (String text) {if (Text = null | | (Getindexofcount (Text, ' (')!= getindexofcount (text, ') '))
{return false;}
return true; /** * Gets the number of times a character appears in another string * * @param text * text * @param ch * character/private static int Getindexofcount (String text, Char 
CH) {int count = 0; for (int i = 0; i < text.length (); i++) {count = (Text.charat (i) = ch)? Count + 1:count;}
return count; }
}

2. [Picture] Mybatis.jpg