diff --git a/g/database/gdb/gdb.go b/g/database/gdb/gdb.go
index adb1a6735..f3afee6c9 100644
--- a/g/database/gdb/gdb.go
+++ b/g/database/gdb/gdb.go
@@ -95,6 +95,7 @@ type DB interface {
 	getCache() *gcache.Cache
 	getChars() (charLeft string, charRight string)
 	getDebug() bool
+	setSchema(sqlDb *sql.DB, schema string) error
 	filterFields(table string, data map[string]interface{}) map[string]interface{}
 	convertValue(fieldValue interface{}, fieldType string) interface{}
 	getTableFields(table string) (map[string]string, error)
@@ -339,10 +340,12 @@ func (bs *dbBase) getSqlDb(master bool) (sqlDb *sql.DB, err error) {
 		sqlDb = v.(*sql.DB)
 	}
 	// 是否开启调试模式
-	bs.SetDebug(node.Debug)
+	bs.db.SetDebug(node.Debug)
 	// 是否手动选择数据库
 	if v := bs.schema.Val(); v != "" {
-		sqlDb.Exec("USE " + v)
+		if e := bs.db.setSchema(sqlDb, v); e != nil {
+			err = e
+		}
 	}
 	return
 }
diff --git a/g/database/gdb/gdb_base.go b/g/database/gdb/gdb_base.go
index 8d1e82db8..0d33a3449 100644
--- a/g/database/gdb/gdb_base.go
+++ b/g/database/gdb/gdb_base.go
@@ -615,3 +615,9 @@ func (bs *dbBase) rowsToResult(rows *sql.Rows) (Result, error) {
 	}
 	return records, nil
 }
+
+// 动态切换数据库
+func (bs *dbBase) setSchema(sqlDb *sql.DB, schema string) error {
+	_, err := sqlDb.Exec("USE " + schema)
+	return err
+}
diff --git a/g/database/gdb/gdb_model.go b/g/database/gdb/gdb_model.go
index ef61c8041..f2ab4d437 100644
--- a/g/database/gdb/gdb_model.go
+++ b/g/database/gdb/gdb_model.go
@@ -30,6 +30,7 @@ type Model struct {
 	orderBy      string        // 排序语句
 	start        int           // 分页开始
 	limit        int           // 分页条数
+	offset       int           // 查询偏移量(OFFSET语法)
 	data         interface{}   // 操作数据(注意仅支持Map/List/string类型)
 	batch        int           // 批量操作条数
 	filter       bool          // 是否按照表字段过滤data参数
@@ -47,6 +48,7 @@ func (bs *dbBase) Table(tables string) *Model {
 		tables:     tables,
 		fields:     "*",
 		start:      -1,
+		offset:     -1,
 		safe:       false,
 	}
 }
@@ -214,6 +216,14 @@ func (md *Model) Limit(limit ...int) *Model {
 	return model
 }
 
+// 链式操作，OFFSET语法（部分数据库支持）。
+// 注意：可以使用Limit方法调用替换该方法特性，底层不同数据库将会自动替换LIMIT语法为OFFSET语法。
+func (md *Model) Offset(offset int) *Model {
+	model := md.getModel()
+	model.offset = offset
+	return model
+}
+
 // 链式操作，翻页，注意分页页码从1开始，而Limit方法从0开始。
 func (md *Model) ForPage(page, limit int) *Model {
 	model := md.getModel()
@@ -605,11 +615,13 @@ func (md *Model) getConditionSql() string {
 	}
 	if md.limit != 0 {
 		if md.start >= 0 {
-			s += fmt.Sprintf(" LIMIT %d, %d", md.start, md.limit)
+			s += fmt.Sprintf(" LIMIT %d,%d", md.start, md.limit)
 		} else {
 			s += fmt.Sprintf(" LIMIT %d", md.limit)
 		}
-
+	}
+	if md.offset >= 0 {
+		s += fmt.Sprintf(" OFFSET %d", md.offset)
 	}
 	return s
 }
diff --git a/g/database/gdb/gdb_pgsql.go b/g/database/gdb/gdb_pgsql.go
index 60d921b1a..44a1c72e2 100644
--- a/g/database/gdb/gdb_pgsql.go
+++ b/g/database/gdb/gdb_pgsql.go
@@ -9,12 +9,16 @@ package gdb
 import (
 	"database/sql"
 	"fmt"
-	"regexp"
+
+	"github.com/gogf/gf/g/text/gregex"
 )
 
 // PostgreSQL的适配.
+//
 // 使用时需要import:
+//
 // _ "github.com/gogf/gf/third/github.com/lib/pq"
+//
 // @todo 需要完善replace和save的操作覆盖
 
 // 数据库链接对象
@@ -37,6 +41,12 @@ func (db *dbPgsql) Open(config *ConfigNode) (*sql.DB, error) {
 	}
 }
 
+// 动态切换数据库
+func (db *dbPgsql) setSchema(sqlDb *sql.DB, schema string) error {
+	_, err := sqlDb.Exec("SET search_path TO " + schema)
+	return err
+}
+
 // 获得关键字操作符
 func (db *dbPgsql) getChars() (charLeft string, charRight string) {
 	return "\"", "\""
@@ -44,11 +54,12 @@ func (db *dbPgsql) getChars() (charLeft string, charRight string) {
 
 // 在执行sql之前对sql进行进一步处理
 func (db *dbPgsql) handleSqlBeforeExec(query string) string {
-	reg := regexp.MustCompile("\\?")
 	index := 0
-	str := reg.ReplaceAllStringFunc(query, func(s string) string {
+	query, _ = gregex.ReplaceStringFunc("\\?", query, func(s string) string {
 		index++
 		return fmt.Sprintf("$%d", index)
 	})
-	return str
+	// 分页语法替换
+	query, _ = gregex.ReplaceString(` LIMIT (\d+),\s*(\d+)`, ` LIMIT $1 OFFSET $2`, query)
+	return query
 }
diff --git a/g/database/gdb/gdb_sqlite.go b/g/database/gdb/gdb_sqlite.go
index f368cd548..708243231 100644
--- a/g/database/gdb/gdb_sqlite.go
+++ b/g/database/gdb/gdb_sqlite.go
@@ -41,7 +41,7 @@ func (db *dbSqlite) getChars() (charLeft string, charRight string) {
 	return "`", "`"
 }
 
-// 在执行sql之前对sql进行进一步处理
+// 在执行sql之前对sql进行进一步处理。
 // @todo 需要增加对Save方法的支持，可使用正则来实现替换，
 // @todo 将ON DUPLICATE KEY UPDATE触发器修改为两条SQL语句(INSERT OR IGNORE & UPDATE)
 func (db *dbSqlite) handleSqlBeforeExec(query string) string {
diff --git a/geg/other/test.go b/geg/other/test.go
index 381a581b9..5bd1eae9c 100644
--- a/geg/other/test.go
+++ b/geg/other/test.go
@@ -1,19 +1,13 @@
 package main
 
 import (
-	"encoding/base64"
 	"fmt"
-	"github.com/gogf/gf/g/encoding/gbase64"
+
+	"github.com/gogf/gf/g/text/gregex"
 )
 
 func main() {
-	data := "HwHsGhXMaGc==="
-	datab, err := gbase64.Decode([]byte(data))
-	fmt.Println(err)
-	fmt.Println(datab)
-	fmt.Println(string(datab))
-
-	s, e := base64.StdEncoding.DecodeString(data)
-	fmt.Println(e)
-	fmt.Println(string(s))
+	query := "SELECT * FROM user where status=1 LIMIT 10, 100"
+	query, _ = gregex.ReplaceString(` LIMIT (\d+),\s*(\d+)`, ` LIMIT $1 OFFSET $2`, query)
+	fmt.Println(query)
 }