callablestatement class. This class is actually a subclass of preparedstatement. Suppose we have a poets database. The database has a stored procedure for setting the age of the poet's death. The following is an old drunk Dylan Thomas (old soak Dylan Thomas) who does not specify the story or culture. Please criticize and correct him. Detailed code for calling:
Try {
Int age = 39;
String poetname = "
Detailed explanation of Android. mk specifications
This article from: http://blog.ednchina.com/laizibin315/1895365/message.aspx
The android. mk file is a required file for compiling C code using ndk. The Android. mk file describes which c files will be compiled and how to compile them. Master android. the preparation of the
= mass_storagePersist. service. acm. enable = 0Ro. mount. fs = EXT4
In this case, we need to pay attention to the ADDITIONAL_DEFAULT_PROPERTIES variable, which is the target variable defined in the makefile file. In the makefile file, ro. secure variables are defined on the ADDITIONAL_DEFAULT_PROPERTIES target variable. Search ADDITIONAL_DEFAULT_PROPERTIES in/build:
Grep-nr "ADDITIONAL_DEFAULT_PROPERTIES ".
./Build/core/main. mk: 330: ADDITIONAL_DE
cyclic redundancy test CRC error detection technology can only do error-free acceptance (just very approximate think is error-free), and can not guarantee reliable transmission.Six, mathematical reasoning although the above content has a clearer mathematical calculation process, in this section will give a more rigorous mathematical model to deepen the impression: consistent with the third section of the content 1. The information to be transmitted is K-bit, 6.1 shows 2. The data sequence m (x)
Android System lunch A current product approximate process consists of the following sections:1. Lunch determine target_product. The vendorsetup.sh script, which is generally located in Vendor/device/build/target/product, has user/eng/userdebug defined respectively.2. The reasonableness of developing check product.By loading the androidproduct.mk file in Vendor/device/build/target/product, record the individual. mk files it includes and the path to wh
the product from selection, variant local variant =$ (-n $ selection |-e [$? -Ne = [-z-o-z // export TARGET_PRODECT, TARGET_BUILD_VARIANT and TARGET_BUILD_TYPE. For example, if full-eng is selected, TARGET_PRODUCT = full, TARGET_BUILD_VARIANT = eng export TARGET_PRODUCT =4. Compile -- make-j8
Make must have Makefile. The Makefile in the Android root directory simply includes a file:
include build/core/ ### DO NOT EDIT THIS FILE ###
Build/core/main. mk
PHP is a weak type of language
PHP has 8 types of Chinese4 scalar//Only one value can be stored1. Integral type: int integer2. Boolean: BOOL Boolean3. Floating-point type: float,double,real4. Character type: string2 compound types//A variable can store multiple values1. Arrays: array//Only multiple variables can be stored2. Objects: Object//stored variables and functionsSpecial type in 21. Resource type: Resource2. NULL type: nullExample: var_dump (variable or value); That is, you can view the
1:./mk n (r) kernel;/mk bootimage; When modifying kernel related code, it is as follows:
alps/kernel/
alps/mediatek/platform/mt65xx/kernel/
alps/mediatek/source/kernel/
alps/mediatek/customer/mt65xx/kernel/
alps/mediatek/customer/common/kernel/
alps/mediatek/customer/$porject _name$/kernel
......
2:./mk N PL When modifying preloader related code, it is as
procedure on the server side. The reduction in the number of round-trips on the network can dramatically optimize the performance.
Use stored procedures
Simple old JDBC supports calling stored procedures through the callablestatement class. This class is actually a subclass of preparedstatement. Suppose we have a poets database. The database has a stored procedure for setting the age of the poet's death. The following is an old drunk Dylan Thomas (ol
dramatically optimize performance.
Using Stored Procedures
Simple old JDBC supports the invocation of stored procedures through the CallableStatement class. The class is actually a subclass of the PreparedStatement. Let's say we have a poets database. There is a stored procedure in the database that sets the age of the poet's death. Here is the old drunkard Dylan Thomas Soak Dylan Thomas, do not sp
Dalvik VM compilation script and source code tree
This article briefly analyzes the structure of Dalvik Virtual Machine source code (Dalvik/Vm) and the compilation script (*. mk)Compile scripts
The directory structure of Dalvik source code is not complex. The compilation script is also very simple. It consists of the following files:
Dalvik/Vm/Android. mk
Dalvik/Vm/reconfiguredvm.
makefile and is defined as follows:
Smdk2410_config: unconfig@ $ (Mkconfig) $ (@: _ Config =) arm ARM920T smdk2410 null s3c24x0
Unconfig ::@ RM-F $ (OBJ) include/config. h $ (OBJ) include/config. mk/$ (OBJ) Board/*/config. tmp $ (OBJ) Board/*/config. tmp
Obviously, when you run # Make smdk2410_config, run the unconfig target first. Note that when the output target is not specified, the OBJ and SRC variables are empty, the commands below unconfig clea
concentrated in build/CORE. Several important *. mk files are as follows:
Main. mk (Master makefile)
Base_rules.mk (normalization of some makefile variables)
Config. mk (configuration of compilation parameters and compilation commands)
Definations. mk (defines many macros used in the compilation system, which is equiv
remote_build item and export
Ifneq ($ (objtree), $ (srctree ))OBJ: = $ (objtree )/SRC: = $ (srctree )/ElseOBJ: =SRC: =EndifExport OBJ SRCIf the output directory objtree and srctree are different from the current uboot directory, assign values to OBJ and SRC. Otherwise, OBJ and SRC are empty.Obj src is defined in config. mk in the main directory, but it is also required before the main makefile contains config. mk
1. Set the compilation option to make-J5 target_arch = x86 target_product = generic target_simulator = false target_build_type = release target_ OS = Linux local_prelink_module = false.
2. Set line 91 in build/CORE/envsetup. mk to x86 (this step can be omitted)
3. Modify Android. mk In the build/tools/dexpreopt directory as a Android-arm.mk and do not compile the module (this module since with emulator ).
M
Using the Usermod command in the RHEL7.2 system to add a user to multiple additional groups, by default, adding multiple additional groups at once can be added in the following ways:Usermod-g Additional Group 1, additional Group 2, ..., additional group N user nameInstance[Email protected] ~]# Useradd MK[[email protected] ~]# ID MKuid=1159 (MK) gid=1159 (MK) grou
Checking build Tools versions...Build/CORE/main. MK: 77: **************************************** ********************Build/CORE/Main. mk: 78: You are attempting to build on a 32-bit system.Build/CORE/Main. mk: 79: only 64-bit build environments are supported beyond froyo/2.2.Build/CORE/main. MK: 80: ******************
After the source code is downloaded, run the following command:
Root @ alex-MS-7236 :~ # Cd mydroid
Root @ alex-MS-7236 :~ /Mydroid # repo sync
An error occurs.========================================================== ====Checking build Tools versions...Build/CORE/main. MK: 76: **************************************** ********************Build/CORE/Main. mk: 77: You are attempting to build on a 32-bit s
) ../config. makInclude $ (SRC_PATH)/subdir. mak
Step 7:Add an av. mk file under ffmpeg. The content is as follows:
# LOCAL_PATH is one of libavutil, libavcodec, libavformat, or libswscale#include $(LOCAL_PATH)/../config-$(TARGET_ARCH).makinclude $(LOCAL_PATH)/../config.makOBJS :=OBJS-yes :=MMX-OBJS-yes :=include $(LOCAL_PATH)/Makefile# collect objectsOBJS-$(HAVE_MMX) += $(MMX-OBJS-yes)OBJS += $(OBJS-yes)FFNAME := lib$(NAME)FFLIBS := $(foreach,NAME,$(
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