这篇文章主要介绍如何让Hibernate支持Access方言，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！

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让Hibernate支持Access方言：

package com.hxtt.support.hibernate;   import org.hibernate.Hibernate;  import org.hibernate.dialect.Dialect;  import org.hibernate.dialect.function.VarArgsSQLFunction;  import org.hibernate.cfg.Environment;  import org.hibernate.dialect.function.NoArgSQLFunction;  import org.hibernate.dialect.function.StandardSQLFunction;   public class HxttDialect extends Dialect {        static final String DEFAULT_BATCH_SIZE = "15";  static final String NO_BATCH = "0";         public HxttDialect() {           super();       //Mathematical Functions       registerFunction("abs", new StandardSQLFunction("abs") );       registerFunction("ceiling", new StandardSQLFunction("ceiling", Hibernate.INTEGER) );       registerFunction("ceil", new StandardSQLFunction("ceil", Hibernate.INTEGER) );   registerFunction("sign", new StandardSQLFunction("sign", Hibernate.INTEGER) );       registerFunction("degrees", new StandardSQLFunction("degrees", Hibernate.DOUBLE) );       registerFunction("exp", new StandardSQLFunction("exp", Hibernate.DOUBLE) );       registerFunction("floor", new StandardSQLFunction("floor", Hibernate.INTEGER) );       registerFunction("int", new StandardSQLFunction("int", Hibernate.INTEGER) );       registerFunction("log", new StandardSQLFunction("log", Hibernate.DOUBLE) );       registerFunction("log10", new StandardSQLFunction("log10", Hibernate.DOUBLE) );       registerFunction("log2", new StandardSQLFunction("log2", Hibernate.DOUBLE) );       registerFunction("ln", new StandardSQLFunction("ln", Hibernate.DOUBLE) );       registerFunction("mod", new StandardSQLFunction("mod", Hibernate.INTEGER) );       registerFunction("pi", new NoArgSQLFunction("pi", Hibernate.DOUBLE) );       registerFunction("pow", new StandardSQLFunction("pow", Hibernate.DOUBLE) );       registerFunction("power", new StandardSQLFunction("power", Hibernate.DOUBLE) );       registerFunction("padians", new StandardSQLFunction("padians", Hibernate.DOUBLE) );       registerFunction("radians", new StandardSQLFunction("radians", Hibernate.DOUBLE) );       registerFunction("rand", new NoArgSQLFunction("rand", Hibernate.DOUBLE) );       registerFunction("round", new StandardSQLFunction("round", Hibernate.INTEGER) );       registerFunction("sign", new StandardSQLFunction("sign", Hibernate.INTEGER) );       registerFunction("sqrt", new StandardSQLFunction("sqrt", Hibernate.DOUBLE) );       registerFunction("trunc", new StandardSQLFunction("trunc", Hibernate.DOUBLE) );       registerFunction("truncate", new StandardSQLFunction("truncate", Hibernate.DOUBLE) );       //Trigonometric Functions       registerFunction("acos", new StandardSQLFunction("acos", Hibernate.DOUBLE) );       registerFunction("asin", new StandardSQLFunction("asin", Hibernate.DOUBLE) );       registerFunction("atan", new StandardSQLFunction("atan", Hibernate.DOUBLE) );       registerFunction("atan2", new StandardSQLFunction("atan2", Hibernate.DOUBLE) );       registerFunction("cos", new StandardSQLFunction("cos", Hibernate.DOUBLE) );       registerFunction("cot", new StandardSQLFunction("cot", Hibernate.DOUBLE) );       registerFunction("crc32", new StandardSQLFunction("crc32", Hibernate.LONG) );       registerFunction("sin", new StandardSQLFunction("sin", Hibernate.DOUBLE) );       registerFunction("tan", new StandardSQLFunction("tan", Hibernate.DOUBLE) );   //String Functions       registerFunction("alltrim", new StandardSQLFunction("alltrim") );       registerFunction("asc", new StandardSQLFunction("asc", Hibernate.INTEGER) );       registerFunction("ascii", new StandardSQLFunction("ascii", Hibernate.INTEGER) );       registerFunction("at", new StandardSQLFunction("at", Hibernate.INTEGER) );       registerFunction("bin", new StandardSQLFunction("bin", Hibernate.STRING) );       registerFunction("bit_length", new StandardSQLFunction("bit_length", Hibernate.LONG) );       registerFunction("char_length", new StandardSQLFunction("char_length", Hibernate.LONG) );       registerFunction("character_length", new StandardSQLFunction("character_length", Hibernate.LONG) );       registerFunction("char", new StandardSQLFunction("char", Hibernate.STRING) );       registerFunction("chr", new StandardSQLFunction("char", Hibernate.STRING) );       registerFunction("chrtran", new StandardSQLFunction("chrtran", Hibernate.STRING) );       registerFunction( "concat", new VarArgsSQLFunction(Hibernate.STRING, "", "||", "") );       registerFunction( "concat_ws", new VarArgsSQLFunction(Hibernate.STRING, "", "||", "") );       registerFunction( "conv", new StandardSQLFunction("conv", Hibernate.STRING) );       registerFunction( "difference", new StandardSQLFunction("difference", Hibernate.STRING) );       registerFunction("hex", new StandardSQLFunction("hex", Hibernate.STRING) );       registerFunction("initcap", new StandardSQLFunction("initcap") );  // registerFunction("insert", new StandardSQLFunction("insert") );       registerFunction("instr", new StandardSQLFunction("instr", Hibernate.INTEGER) );       registerFunction("lcase", new StandardSQLFunction("lcase") );       registerFunction("left", new StandardSQLFunction("left", Hibernate.INTEGER) );       registerFunction("len", new StandardSQLFunction("len", Hibernate.LONG) );       registerFunction("length", new StandardSQLFunction("length", Hibernate.LONG) );       registerFunction("locate", new StandardSQLFunction("locate", Hibernate.LONG) );       registerFunction("lower", new StandardSQLFunction("lower") );       registerFunction("lpad", new StandardSQLFunction("lpad", Hibernate.STRING) );       registerFunction("ltrim", new StandardSQLFunction("ltrim") );       registerFunction("mid", new StandardSQLFunction("mid", Hibernate.STRING) );       registerFunction("oct", new StandardSQLFunction("oct", Hibernate.STRING) );       registerFunction("octet_length", new StandardSQLFunction("octet_length", Hibernate.LONG) );       registerFunction("padc", new StandardSQLFunction("padc", Hibernate.STRING) );       registerFunction("padl", new StandardSQLFunction("padl", Hibernate.STRING) );       registerFunction("padr", new StandardSQLFunction("padr", Hibernate.STRING) );       registerFunction("position", new StandardSQLFunction("position", Hibernate.INTEGER) );       registerFunction("proper", new StandardSQLFunction("proper") ) ;       registerFunction("repeat", new StandardSQLFunction("repeat", Hibernate.STRING) );       registerFunction("replicate", new StandardSQLFunction("replicate", Hibernate.STRING) );       registerFunction("replace", new StandardSQLFunction("replace", Hibernate.STRING) );       registerFunction("right", new StandardSQLFunction("right", Hibernate.INTEGER) );       registerFunction("rpad", new StandardSQLFunction("rpad", Hibernate.STRING) );       registerFunction("rtrim", new StandardSQLFunction("rtrim") );       registerFunction("soundex", new StandardSQLFunction("soundex") );       registerFunction("space", new StandardSQLFunction("space", Hibernate.STRING) );       registerFunction( "strcat", new VarArgsSQLFunction(Hibernate.STRING, "", "||", "") );       registerFunction("strcmp", new StandardSQLFunction("strcmp", Hibernate.INTEGER) );       registerFunction("strconv", new StandardSQLFunction("strconv", Hibernate.STRING) );       registerFunction("strtran", new StandardSQLFunction("strtran", Hibernate.STRING) );       registerFunction("stuff", new StandardSQLFunction("stuff", Hibernate.STRING) );       registerFunction("substr", new StandardSQLFunction("stuff", Hibernate.STRING) );       registerFunction("substring", new StandardSQLFunction("substring", Hibernate.STRING) );       registerFunction("translate", new StandardSQLFunction("translate", Hibernate.STRING) );       registerFunction("trim", new StandardSQLFunction("trim") );       registerFunction("ucase", new StandardSQLFunction("ucase") );       registerFunction("upper", new StandardSQLFunction("upper") );       registerFunction("charmirr", new StandardSQLFunction("charmirr") );       registerFunction("reverse", new StandardSQLFunction("reverse") );        //Date/Time Functions       registerFunction("addtime",new StandardSQLFunction("addtime",Hibernate.TIMESTAMP));       registerFunction("cdow",new StandardSQLFunction("cdow",Hibernate.STRING));       registerFunction("cmonth",new StandardSQLFunction("cmonth",Hibernate.STRING));       registerFunction("curdate", new NoArgSQLFunction("curdate", Hibernate.DATE) );       registerFunction("curtime", new NoArgSQLFunction("curtime", Hibernate.TIME) );       registerFunction("date", new StandardSQLFunction("date", Hibernate.DATE) );       registerFunction("datediff", new StandardSQLFunction("datediff", Hibernate.INTEGER) );       registerFunction("datetime",new   NoArgSQLFunction("datetime",Hibernate.TIMESTAMP));       registerFunction("date_add",new   StandardSQLFunction("date_add",Hibernate.DATE));       registerFunction("date_sub",new   StandardSQLFunction("date_sub",Hibernate.DATE));       registerFunction("adddate",new   StandardSQLFunction("adddate",Hibernate.DATE));       registerFunction("subdate",new   StandardSQLFunction("subdate",Hibernate.DATE));       registerFunction("day", new StandardSQLFunction("day", Hibernate.INTEGER) );       registerFunction("dayofmonth", new StandardSQLFunction("dayofmonth", Hibernate.INTEGER) );       registerFunction("dayname", new StandardSQLFunction("dayname", Hibernate.STRING) );       registerFunction("dayofweek", new StandardSQLFunction("dayofweek", Hibernate.INTEGER) );       registerFunction("dayofyear", new StandardSQLFunction("dayofyear", Hibernate.INTEGER) );       registerFunction("extract",new   StandardSQLFunction("extract",Hibernate.INTEGER));       registerFunction("dow",new StandardSQLFunction("dow",Hibernate.STRING));       registerFunction("from_days", new StandardSQLFunction("from_days", Hibernate.DATE) );       registerFunction("gomonth", new StandardSQLFunction("gomonth", Hibernate.DATE) );       registerFunction("hour", new StandardSQLFunction("hour", Hibernate.INTEGER) );       registerFunction("last_day", new StandardSQLFunction("last_day", Hibernate.DATE) );       registerFunction("minute",new   StandardSQLFunction("minute",Hibernate.INTEGER));       registerFunction("millisecond",new   StandardSQLFunction("millisecond",Hibernate.INTEGER));       registerFunction("microsecond",new   StandardSQLFunction("microsecond",Hibernate.INTEGER));       registerFunction("month",new   StandardSQLFunction("month",Hibernate.INTEGER));       registerFunction("monthname",new StandardSQLFunction("monthname",Hibernate.STRING));       registerFunction("now", new NoArgSQLFunction("now", Hibernate.TIMESTAMP) );       registerFunction("quarter", new StandardSQLFunction("quarter", Hibernate.INTEGER) );       registerFunction("second", new StandardSQLFunction("second", Hibernate.INTEGER) );       registerFunction("sub_time", new NoArgSQLFunction("sub_time", Hibernate.TIMESTAMP) );       registerFunction("sysdate", new NoArgSQLFunction("sysdate", Hibernate.TIMESTAMP) );       registerFunction("time", new StandardSQLFunction("time", Hibernate.TIME) );       registerFunction("timediff", new StandardSQLFunction("timediff", Hibernate.TIME) );       registerFunction("timestamp", new StandardSQLFunction("timestamp", Hibernate.TIMESTAMP) );       registerFunction("timestampadd", new StandardSQLFunction("timestampadd", Hibernate.TIMESTAMP) );       registerFunction("timestampdiff", new StandardSQLFunction("timestampdiff", Hibernate.INTEGER) );       registerFunction("to_days", new StandardSQLFunction("to_days", Hibernate.INTEGER) );       registerFunction("week", new StandardSQLFunction("week", Hibernate.INTEGER) );       registerFunction("weekofyear", new StandardSQLFunction("weekofyear", Hibernate.INTEGER) );       registerFunction("year", new StandardSQLFunction("year", Hibernate.INTEGER) );  //boolean functions      registerFunction("empty", new StandardSQLFunction("empty", Hibernate.BOOLEAN) );      registerFunction("isblank", new StandardSQLFunction("isblank", Hibernate.BOOLEAN) );      registerFunction("isalpha", new StandardSQLFunction("isalpha", Hibernate.BOOLEAN) );      registerFunction("isdigit", new StandardSQLFunction("isdigit", Hibernate.BOOLEAN) );      registerFunction("isnull", new StandardSQLFunction("isnull", Hibernate.BOOLEAN) );  //Conversion Functions      registerFunction("cbool", new StandardSQLFunction("cbool", Hibernate.BOOLEAN) );      registerFunction("cbyte", new StandardSQLFunction("cbyte", Hibernate.BYTE) );      registerFunction("cdate", new StandardSQLFunction("cdate", Hibernate.DATE) );      registerFunction("cdbl", new StandardSQLFunction("cdbl", Hibernate.DOUBLE) );      registerFunction("cint", new StandardSQLFunction("cint", Hibernate.INTEGER) );      registerFunction("clng", new StandardSQLFunction("clng", Hibernate.LONG) );      registerFunction("csng", new StandardSQLFunction("csng", Hibernate.FLOAT) );      registerFunction("cstr", new StandardSQLFunction("cstr", Hibernate.STRING) );      registerFunction("ctod", new StandardSQLFunction("ctod", Hibernate.DATE) );      registerFunction("ctot", new StandardSQLFunction("ctot", Hibernate.TIMESTAMP) );      registerFunction("dtoc", new StandardSQLFunction("dtoc", Hibernate.STRING) );      registerFunction("dtot", new StandardSQLFunction("dtot", Hibernate.TIMESTAMP) );      registerFunction("ttoc", new StandardSQLFunction("ttoc", Hibernate.STRING) );      registerFunction("ttod", new StandardSQLFunction("ttod", Hibernate.DATE) );  //Security Functions       registerFunction("compress", new StandardSQLFunction("compress", Hibernate.STRING) );       registerFunction("uncompress", new StandardSQLFunction("uncompress", Hibernate.STRING) );       registerFunction("encrypt", new StandardSQLFunction("encrypt", Hibernate.STRING) );       registerFunction("decrypt", new StandardSQLFunction("decrypt", Hibernate.STRING) );       registerFunction("encode", new StandardSQLFunction("encode", Hibernate.STRING) );       registerFunction("decode", new StandardSQLFunction("decode", Hibernate.STRING) );       registerFunction("md5", new StandardSQLFunction("md5", Hibernate.STRING) );       registerFunction("crypt3", new StandardSQLFunction("crypt3", Hibernate.STRING) );  //System Functions       registerFunction( "database", new NoArgSQLFunction("database", Hibernate.STRING, false) );       registerFunction( "user", new NoArgSQLFunction("user", Hibernate.STRING, false) );       registerFunction( "deleted", new NoArgSQLFunction("deleted", Hibernate.BOOLEAN, false) );       registerFunction( "reccount", new NoArgSQLFunction("reccount", Hibernate.LONG, false) );       registerFunction( "recno", new NoArgSQLFunction("recno", Hibernate.LONG, false) );       registerFunction( "rowlocked", new NoArgSQLFunction("rowlocked", Hibernate.BOOLEAN, false) );  //Miscellaneous Functions       registerFunction( "nvl", new StandardSQLFunction("nvl") );       registerFunction( "ifnull", new StandardSQLFunction("ifnull") );         getDefaultProperties().setProperty(Environment.MAX_FETCH_DEPTH, "2");       getDefaultProperties().setProperty(Environment.STATEMENT_BATCH_SIZE, DEFAULT_BATCH_SIZE);       }  }    ////////////////////////////////////////////////////////////////////////////////    package com.hxtt.support.hibernate;   import java.sql.Types;    /**  * An SQL dialect for HXTT Access.  * @author daiwei  */ public class HxttAccessDialect   extends HxttDialect {        public HxttAccessDialect() {           super();           //complete map           //registerColumnType( Types.BIT, "bit" );           //registerColumnType( Types.CHAR, "varchar(1)" );        // HXTT Access DON'T SUPPORT CHAR,and there is no varchar(1) column type,so there is no CHAR           registerColumnType(Types.CHAR, "varchar($l)");           registerColumnType(Types.VARCHAR, 255, "varchar($l)");           registerColumnType(Types.LONGVARCHAR, "longvarchar");           registerColumnType(Types.NUMERIC, "numeric");           registerColumnType(Types.NUMERIC, "numeric($p,$s)");           registerColumnType(Types.BOOLEAN, "boolean");           registerColumnType( Types.BIGINT, "NUMERIC(19,0)" );   // MS Access DON'T SUPPORT BIGINT           //registerColumnType( Types.TINYINT, "number(3,0)" );    // MS Access DON'T SUPPORT TINYINT           //registerColumnType(Types.TINYINT, "tinyint"); //HXTT Access' tinyint is from 0 to 255           registerColumnType(Types.TINYINT, "smallint"); //HXTT Access' tinyint is from 0 to 255           registerColumnType(Types.SMALLINT, "smallint");           registerColumnType(Types.INTEGER, "integer");           registerColumnType(Types.REAL, "real");           //registerColumnType( Types.FLOAT, "float" ); // HXTT Access DON'T SUPPORT FLOAT ,it will be a double type           registerColumnType(Types.DOUBLE, "double");           //registerColumnType( Types.BINARY, 6784, "binary" );           registerColumnType(Types.VARBINARY, 510, "varbinary");           //registerColumnType( Types.LONGVARBINARY, "longvarbinary");            //registerColumnType( Types.DATE, "date" );           // registerColumnType( Types.TIME, "time" );    //   HXTT Access DON'T SUPPORT TIME           registerColumnType(Types.TIMESTAMP, "timestamp");           //registerColumnType( Types.BLOB, "blob" ); // BLOB COLUMN WILL CHANGE TO   JAVA_OBJECT TYPE COLUMN           //registerColumnType( Types.CLOB, "clob" ); // CLOB COLUMN WILL CHANGE TO   LONGVARCHAR TYPE COLUMN           registerColumnType(Types.OTHER, "currency");           //registerColumnType( Types.OTHER, "graphics" );           registerColumnType(Types.OTHER, "ole");           registerColumnType( Types.JAVA_OBJECT, "java_object" );        }        //ALTER table TBNAME ADD COLUMN FIELDNAME FIELDTYPE       public String getAddColumnString() {           return "add column";       }       ///处理到此函数       public boolean bindLimitParametersInReverseOrder() {           return true;       }         public String getCreateSequenceString(String sequenceName) {           // create sequence if not exists userID start WITH 100 increment by 2 maxvalue 2000 cache 5 cycle;           return "create sequence " + sequenceName + " start with 1"; //       }        public String getCurrentTimestampSelectString() {           return "?now()";       }         public String getDropForeignKeyString() {          throw new UnsupportedOperationException( "No drop foreign key syntax supported by HxttAccessDialect" );       }        public String getDropSequenceString(String sequenceName) {               //drop sequence if exists userID;               return "drop sequence " + sequenceName;       }        public String getLimitString(String sql, boolean hasOffset) {  /*         return new StringBuffer(sql.length() + 20)               .append(sql)               .append(hasOffset ? " limit ?, ?" : " limit ?")               .toString();*/           sql = sql.trim();           boolean isForUpdate = false;           if ( sql.toLowerCase().endsWith(" for update") ) {               sql = sql.substring( 0, sql.length()-11 );               isForUpdate = true;           }            StringBuffer pagingSelect = new StringBuffer( sql.length()+100 );           if (hasOffset) {               pagingSelect.append("select * from ( select row_.*, RECNO() rownum_ from ( ");           }           else {               pagingSelect.append("select * from ( ");           }           pagingSelect.append(sql);           if (hasOffset) {               pagingSelect.append(" ) row_ where RECNO() < = ?) where rownum_ > ?");           }           else {               pagingSelect.append(" ) where RECNO() < = ?");           }            if (isForUpdate) pagingSelect.append(" for update");            return pagingSelect.toString();       }         ////????       /**        * A query used to find all sequences        *        * @see org.hibernate.tool.hbm2ddl.SchemaUpdate        */      public String getQuerySequencesString() {           return null;       }        //?NEXTVAL('SEQUENCENAME')       public String getSequenceNextValString(String sequenceName) {           return "?" + getSelectSequenceNextValString( sequenceName ) ;       }        public String getSelectSequenceNextValString(String sequenceName) {           return   "nextval('" + sequenceName+"')";       }         ////????       public boolean isCurrentTimestampSelectStringCallable() {           return false;       }         public boolean qualifyIndexName() {           return false;       }         public boolean supportsCascadeDelete() {           return true;//false;       }         public boolean supportsCurrentTimestampSelection() {           return true;       }         public boolean supportsIfExistsBeforeTableName() {           return true;       }         public boolean supportsLimit() {           return true;       }         public boolean supportsUnionAll() {           return true;       }        public boolean supportsSequences() {              return true;       }    /*     public boolean supportsIdentityColumns() {           return true;       }        public String getIdentitySelectString() {           return "select last_insert_id()";       }        public String getIdentityColumnString() {           return "not null auto_increment"; //starts with 1, implicitly       }*/  }

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